STRUCTURED ASSET MORTGAGE INVESTMENTS INC
8-K, 1998-07-07
ASSET-BACKED SECURITIES
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                               ------------------

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

                Date of Report (date of earliest event reported)
                                  June 30, 1998

                    STRUCTURED ASSET MORTGAGE INVESMENTS INC.
                    -----------------------------------------
               (Exact name of registrant as specified in charter)

              Structured Asset Mortgage Invesments Inc. (as Seller
                      under a Pooling Agreement dated as of
                  March 1, 1998, as amended by Amendment No. 1
            dated as of June 30, 1998, providing for the issuance of
                    Structured Asset Mortgage Invesments Inc.
                    Pass-Through Certificates, Series 1998-2)

   Delaware                           333-13617                13-3633241
   --------                           ---------                ----------
(State or other                      (Commission              (IRS Employer
jurisdiction of                     File Number)           Identification No.)
incorporation)

                    245 Park Avenue, New York, New York 10167
                    -----------------------------------------
               (Address of principal executive offices) (Zip Code)

        Registrant's telephone number, including area code (212) 272-2000
                                                           --------------

                                 Not Applicable
              -----------------------------------------------------
         (Former name or former address, if changed since last report.)


<PAGE>

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.

         (c)  Exhibits

                  Exhibit No.

                  1.2  Supplement  dated as of June 30, 1998 to Terms  Agreement
dated as of March 26, 1998, each between the Registrant and Bear,  Stearns & Co.
Inc.

                  4.2  Amendment  No.  1 dated as of June  30,  1998 to  Pooling
Agreement dated as of March 1, 1998, each between the Registrant and The Bank of
New York, as Trustee.

<PAGE>
                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                    STRUCTURED ASSET MORTGAGE INVESMENTS INC.
                                  (Registrant)


Date:  June 30, 1998                By:  /s/ Joseph T. Jurkowski, Jr.
                                             _________________________
                                            Name:  Joseph T. Jurkowski, Jr.
                                            Title:   Vice President
<PAGE>
                                  EXHIBIT INDEX


                                                           Sequentially
Exhibit Number  Description                                Numbered Page
- --------------  -----------                                -------------
1.2             Supplement dated as of June 30, 1998
                to Terms Agreement dated as of March
                26, 1998, each between the Registrant
                and Bear, Stearns & Co. Inc.

4.2             Amendment No. 1 dated as of June 30,
                1998 to Pooling Agreement dated as of
                March 1, 1998, each between the
                Registrant and The Bank of New York,
                as Trustee.



                                                                     EXHIBIT 1.2



                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.

                            Pass-Through Certificates

            SUPPLEMENT TO TERMS AGREEMENT DATED AS OF MARCH 26, 1998
            --------------------------------------------------------


                                                      Dated: as of June 30, 1998

To:                 STRUCTURED ASSET MORTGAGE INVESTMENTS INC.

Re:                 Underwriting Agreement dated June 25, 1996 (the
                    "Underwriting Agreement") and Terms Agreement dated as of
                    March 26, 1998 ("the "Terms Agreement")

Underwriter:        Bear, Stearns & Co. Inc. (the "Underwriter")

Series Designation: Series 1998-2

                  Reference is made to the Pooling  Agreement  dated as of March
1, 1998 (the "Pooling  Agreement") between Structured Asset Mortgage Investments
Inc., as seller ("SAMI"),  and The Bank of New York, as trustee (the "Trustee"),
as  amended  by  Amendment  No. 1 dated as of June 30,  1998  (the  "Amendment")
between the Trustee and SAMI. The Underwriter and SAMI hereby agree that, on and
after the Exchange Effective Date, the New Certificates, with the interest rates
and payment  characteristics  as described in the  Amendment,  shall  constitute
Publicly Offered Certificates, as such term is used in the Terms Agreement.

                  All  capitalized  terms used but not defined herein shall have
the meanings assigned to such terms in the Pooling Agreement,  as amended by the
Amendment.

BEAR, STEARNS & CO. INC.


By: __________________
     Name:
     Title:

Accepted:

STRUCTURED ASSET MORTGAGE INVESTMENTS INC.

By: ____________________
     Name:
     Title:

                                                                     EXHIBIT 4.2

                                                                  EXECUTION COPY


                  AMENDMENT  NO. 1 dated as of June 30, 1998 between  Structured
Asset  Mortgage  Investments  Inc.  (formerly Bear Stearns  Mortgage  Securities
Inc.),  as seller  (the  "Seller")  and The Bank of New York,  as  trustee  (the
"Trustee")  of the POOLING  AGREEMENT (as amended the  "Agreement")  dated as of
March 1, 1998 between the Seller and the Trustee.

                  WHEREAS, the Seller desires to amend certain provisions of the
Agreement  to provide for the exchange of the Class A  Certificates  for the New
Certificates  (as defined  herein) and the election of REMIC status with respect
to the Class A Certificates and certain other assets;

                  WHEREAS,  the  holder of all of the Class A  Certificates  has
consented to the amendment provided for herein;

                  WHEREAS,  an  election  has  been  made to  treat  the  assets
constituting REMIC II as a "real estate mortgage  investment  conduit" ("REMIC")
for federal  income tax purposes  and on March 30, 1998,  each Class of REMIC II
Regular  Certificates  was  designated  a "regular  interest" in a REMIC and the
Class R-2 Certificate represents the "residual interest" in REMIC II;

                  WHEREAS,  an  election  has  been  made to  treat  the  assets
constituting REMIC I as a REMIC for federal income tax purposes and on March 30,
1998, each Class of REMIC Regular Certificates (other than the New Certificates)
was designated a "regular interest" in REMIC I and the Class R-1 Certificate was
designated the "residual interest" in REMIC I;

                  WHEREAS,  an  election  will  be  made  to  treat  the  assets
constituting  REMIC III as a REMIC for federal  income tax  purposes  and on the
Exchange  Effective Date, each Class of New  Certificates  (other than the Class
R-3  Certificate)  will be  designated  a "regular  interest" in a REMIC and the
Class R-3 Certificate will represent the "residual interest" in REMIC III; and

                  WHEREAS,  all  capitalized  terms used but not defined  herein
shall have the meanings assigned to such terms in the Agreement.

                  NOW,  THEREFORE,   the  parties  hereto  agree  to  amend  the
Agreement as follows:

                  1. Delete the  following  terms in Section 1.01 and insert the
following in their place:

                  "Book-Entry Certificate: Initially each Certificate other than
a Class H, Class PO, Class R-1, Class R-2 or Class R-3 Certificate.

                  Certificate: Any certificate, evidencing a beneficial interest
in the  Trust  as  executed  hereunder  by the  Trustee  and  authenticated  and
delivered hereunder by the Certificate Registrar, substantially, with respect to
each  Class,  in the form of  Exhibits A through L hereto and from and

<PAGE>


after the Exchange  Effective Date,  Exhibits P through U hereto,  respectively,
with all blanks therein appropriately completed.

                  Class  Deferred  Principal:  For each  Class  of  Certificates
(other  than the  Class X and  Class PO  Certificates  and  from and  after  the
Exchange  Effective  Date,  the  New  Certificates)  immediately  following  any
Distribution Date or Supplemental  Distribution  Date, as applicable,  an amount
equal to the  excess of (i) the  applicable  Class  Optimal  Principal  for such
Distribution   Date  or  Supplemental   Distribution  Date  for  such  Class  of
Certificates  over (ii) the principal paid to such Class of Certificates on such
Distribution Date or Supplemental Distribution Date.

                  Class  Optimal  Principal:  With  respect  to  each  Class  of
Certificates  (other  than the  Class X and Class PO  Certificates  and from and
after the Exchange Effective Date, the New Certificates) and a Distribution Date
or  Supplemental  Distribution  Date,  an  amount  equal  to the  sum of (i) the
applicable Class Percentage Principal,  (ii) Additional Principal, if any, to be
paid to such Class and (iii) the applicable Class Deferred Principal immediately
following the prior  Distribution Date (or in the case of the first Distribution
Date,  the  Closing  Date)  or  Supplemental   Distribution  Date,  if  any,  as
applicable.

                  Class  Percentage  Principal:  With  respect  to each Class of
Certificates  (other  than the  Class X and Class PO  Certificates  and from and
after the Exchange  Effective Date, the New  Certificates) and each Distribution
Date or  Supplemental  Distribution  Date, as  applicable,  such Class' pro rata
share based upon its respective  Certificate Principal Balance immediately prior
to the applicable  Distribution Date, of the lesser of (i) principal collections
on the  Pooled  Securities  for  which  both the  Pooled  Security  distribution
(including  for this purpose for the April 1, 1998 and May 4, 1998  Distribution
Dates and related Supplemental  Distribution Dates, if any, any Payment Transfer
Amounts) and the related Pooled Security Distribution Date Information have been
received by the Trustee by the applicable Determination Time and (ii) the excess
of (x) the aggregate Pooled Security Principal Balance of such Pooled Securities
immediately  following the second preceding Pooled Security  Distribution  Dates
over  (y) the  aggregate  Pooled  Security  Principal  Balance  of  such  Pooled
Securities  immediately  following the  immediately  preceding  Pooled  Security
Distribution  Dates  exclusive  in the case of  clause  (ii) and a  Supplemental
Distribution  Date of any Pooled  Securities,  the  distributions  on which were
included  in  the  distribution  made  on  the  immediately   preceding  related
Distribution Date;  provided that if either the Pooled Security  distribution or
the related Pooled Security Distribution Date Information have not been received
by the  immediately  following  Supplemental  Distribution  Date,  the amount in
clause  (x) will be as of  immediately  following  the  third  preceding  Pooled
Security Distribution Date for such Pooled Security.

                  Majority  Certificateholders:   The  Holders  of  Certificates
evidencing  in the  aggregate  greater  than  50% of  the  aggregate  Percentage
Interests  of all the  Certificates  other  than,  from and after  the  Exchange
Effective Date, the Class A Certificates.

                  Original   Certificate   Principal   Balance:   The  aggregate
principal balance of any Class of Certificates (other than the New Certificates)
as of the  Closing  Date as set forth in Section  4.01(d) and from and after the
Exchange  Effective  Date, the aggregate  principal  balance of any


                                      -2-
<PAGE>


Class of New  Certificates  as of the  Exchange  Effective  Date as set forth in
Section  4.01A.(d)  as such  balance may be reduced  following  the July 2, 1998
Distribution  Date and the related  Supplemental  Distribution  Date, if any, as
provided in Section 4.01A(d).

                  Percentage   Interest:   With   respect   to  each   Class  of
Certificates  and any  Certificate  in such  Class,  the  portion  of such Class
represented  by such  Certificate,  expressed as a percentage,  the numerator of
which is the initial  outstanding  principal amount of such  Certificate  (other
than the New  Certificates)  as of the  Closing  Date or with  respect  to a New
Certificate, as of the Exchange Effective Date, as specified on the face thereof
and as  such  amount  may be  reduced  pursuant  to  Section  4.01A(d),  and the
denominator  of which is the  Original  Certificate  Principal  Balance for such
Class and with respect to all Classes of Certificates and any Certificate of any
Class, the portion of all Certificates represented by such Certificate expressed
as a percentage, (i) with respect to each Class of Certificates other than a New
Certificate,  the  numerator  of which is the initial  principal  amount of such
Certificate  as of the Closing Date,  as specified on the face thereof,  and the
denominator of which is the sum of the Original  Certificate  Principal Balances
of all Classes of Certificates  (other than the New  Certificates) and (ii) with
respect  to each Class of New  Certificates  the  product of (x) the  Percentage
Interest of all of the Class A Certificates pursuant to clause (i) above and (y)
the fraction, the numerator of which is the initial principal amount of such New
Certificate as of the Exchange  Effective Date, as specified on the face thereof
and as  such  amount  may be  reduced  pursuant  to  Section  4.01A(d),  and the
denominator of which is the sum of the Original  Certificate  Principal Balances
of all Classes of New Certificates, as specified on the face thereof and as such
amounts may be reduced pursuant to Section 4.01A(d).

                  Physical Certificates: The Class H, Class PO, Class R-1, Class
R-2 and Class R-3  Certificates  and following the Exchange  Effective Date, the
Class A Certificates  in accordance with Section  4.01(a);  provided that as set
forth in Section 4.01(a), if either Class H or Class PO Certificates have become
Global  Certificates,  then with  respect to such Class or Classes,  only to the
extent provided in Section 4.02.

                  Principal  Distribution Amount: With respect to a Distribution
Date  or  Supplemental  Distribution  Date,  the  sum  of the  Class  Percentage
Principal for all Classes of Certificates  (other than the Class X and the Class
PO  Certificates  and  from and  after  the  Exchange  Effective  Date,  the New
Certificates).

                  Residual Certificates:  The Class R-1, Class R-2 and Class R-3
Certificates.

                  Trust:   The  segregated   pool  of  assets  subject   hereto,
constituting  the  corpus of the trust  created  hereby  and to be  administered
hereunder, consisting of:

                  (i) the Pooled Securities;

                  (ii) all amounts  payable on the Pooled  Securities  following
                  the  Pooled   Security   Information   Date  pursuant  to  the
                  Underlying Agreements;



                                      -3-
<PAGE>

                  (iii) the  Accounts  and such funds or assets as are from time
                  to time deposited therein;

                  (iv) the Seller's rights under the Transfer Agreement;

                  (v) from and after the Exchange Effective Date and relating to
                  the New Certificates,  the Class A Certificates outstanding on
                  the Exchange  Effective  Date;  plus  interest  accrued on the
                  Class A Certificates from June 1, 1998; and

                  (vi)  the  income,  payments  and  proceeds  of  each  of  the
                  foregoing."


                  2. Insert the following terms in Section 1.01:

                  "Class A Distribution  Amount: The sum of the Class A Interest
Distribution Amount and the Class A Principal Amount,

                  Class A Interest  Distribution  Amount: The amount distributed
on each  Distribution  Date and  related  Supplemental  Distribution  Date  with
respect  to   interest  on  the  Class  A   Certificates   pursuant  to  Section
3.05(a)(i)(C) and 3.05(a)(ii)(B).

                  Class A Loss Amount: The Loss Amounts allocated to the Class A
Certificates pursuant to Section 3.10.

                  Class A Principal  Distribution Amount: The amount distributed
on each  Distribution  Date and  related  Supplemental  Distribution  Date  with
respect  to  principal  on  the  Class  A   Certificates   pursuant  to  Section
3.05(a)(i)(E) and 3.05(a)(ii)(D).

                  Exchange Effective Date:  June 30, 1998.

                  New  Certificates:  The Class A-1, Class A-2, Class A-3, Class
A-4, Class A-5 and Class R-3 Certificates.

                  REMIC  III:  That  group  of  assets  contained  in the  Trust
designated as a REMIC  consisting of (i) the Class A  Certificates  and (ii) any
proceeds of the foregoing.

                  REMIC III Certificates: The REMIC III Regular Certificates and
Class R-3 Certificates.

                  REMIC III Regular Certificates: Each Class of New Certificates
other than the Class R-3 Certificate."

                  3. Insert the following immediately following Section 2.02:



                                      -4-
<PAGE>

                  "Section  2.02A.  Exchange  of New  Certificates  for  Class A
Certificates

                  "The Trustee  acknowledges on the Exchange  Effective Date the
receipt  by it of the Class A  Certificates,  in good faith and  without  actual
notice of any adverse claim,  and declares that it holds and will hold the Class
A  Certificates  in trust for the  exclusive  use and benefit of all present and
future  holders  of the New  Certificates  in  accordance  with the terms of the
Agreement.  Concurrently  with such  transfer,  delivery and  assignment  and in
exchange  therefor,  the Trustee has executed and caused to be countersigned and
delivered  to or  upon  the  order  of the  Class A  Certificateholder,  the New
Certificates in authorized denominations."

                  4.  Insert  the  following  in  the  second  line  of  Section
3.05(a)(i) immediately following the words "Distribution Date":

                  "to  each   Class  of   Certificates   (other   than  the  New
Certificates),  provided that the Class A  Distribution  Amount shall be paid to
the New Certificates as described in Section 3.05A.,"

                  5. Insert the following immediately following Section 3.05:

                  "Section 3.05A.   Distributions on New Certificates

                  (a)   (i)  On  each   Distribution   Date   and   Supplemental
                  Distribution   Date,  on  and  after  the  Distribution   Date
                  following the July 1998 Pooled  Security  Distribution  Dates,
                  the Trustee shall apply the Class A Distribution Amount in the
                  following manner and order of priority:

                           (A)      from  the  Class  A  Interest   Distribution
                                    Amount,  to the Holders of each Class of New
                                    Certificates as  distributions  of interest,
                                    an  amount   equal  to   interest   for  the
                                    applicable  Class accrued at the  applicable
                                    per  annum   Certificate   Rate  during  the
                                    Interest   Accrual  Period   preceding  such
                                    Distribution   Date   on   its   Certificate
                                    Principal Balance  immediately prior to such
                                    Distribution Date;

                           (B)      from  the  Class  A  Principal  Distribution
                                    Amount,  as distributions  of principal,  to
                                    the  holders  of  the  New  Certificates  as
                                    follows:

                                    (i)   first,     to    the     Class     R-3
                                          Certificateholder  until the Class R-3
                                          Certificate Principal Balance has been
                                          reduced to zero;

                                    (ii)  second,     to    the     Class    A-1
                                          Certificateholders until the Class A-1
                                          Certificate Principal Balance has been
                                          reduced to $45,750,000;

                                    (iii) third, until the Class A-1 Certificate
                                          Principal  Balance has been reduced to
                                          $40,750,000,   5.2631578947%   to  the
                                          Class   A-1   Certificateholders   and
                                          94.7368421053%    sequentially,     as
                                          follows;



                                      -5-
<PAGE>

                                          (a)    to      the      Class      A-2
                                                 Certificateholders   until  the
                                                 Class A-2 Certificate Principal
                                                 Balance  has  been  reduced  to
                                                 $25,000,000;

                                          (b)    21.875%   to  the   Class   A-2
                                                 Certificateholders  and 78.125%
                                                 to      the      Class      A-4
                                                 Certificateholders   until  the
                                                 Class A-4 Certificate Principal
                                                 Balance  has  been  reduced  to
                                                 zero; and

                                          (c)    to      the      Class      A-2
                                                 Certificateholders   until  the
                                                 Class A-2 Certificate Principal
                                                 Balance  has  been  reduced  to
                                                 zero;

                                    (iv)  fourth,     to    the     Class    A-1
                                          Certificateholders until the Class A-1
                                          Certificate Principal Balance has been
                                          reduced to zero;

                                    (v)   fifth,     to    the     Class     A-3
                                          Certificateholders until the Class A-3
                                          Certificate Principal Balance has been
                                          reduced to zero; and

                                    (vi)  sixth,     to    the     Class     A-5
                                          Certificateholders until the Class A-5
                                          Certificate Principal Balance has been
                                          reduced to zero; and

                           (C)      after  each  Class  of  REMIC  III   Regular
                                    Certificates  has  been  paid in  full,  any
                                    remaining Class A Distribution Amount to the
                                    Class R-3 Certificateholder.

                  6. Delete Section 3.10 and insert the following in its place:

                  "Section   3.10.   Allocation   of  Loss   Amounts.   On  each
Distribution  Date  and  Supplemental   Distribution  Date,  the  Trustee  shall
determine the Loss Amounts and shall allocate it to the Certificates by reducing
the Certificate  Principal Balance of the Classes of Certificates other than the
Class X, Class PO and New Certificates (in reverse alphabetical order commencing
with the  Class H  Certificates)  until  the  respective  Certificate  Principal
Balances thereof are reduced to zero. On each Distribution Date and Supplemental
Distribution  Date,  the Trustee shall  allocate the Class A Loss Amounts to the
Classes of New  Certificates  by reducing the Certificate  Principal  Balance of
each Class of New Certificates, pro rata, based on Certificate Principal Balance
of each such Class until the Certificate Principal Balance of each such Class is
reduced to zero.  Any Loss Amounts or Class A Loss Amounts  allocated to a Class
of  Certificates  shall be  allocated  among the  Certificates  of such Class in
proportion to their respective Percentage Interests."

                  7. Insert the following in the second line of Section  4.01(a)
immediately following March 27, 1998:

                  "and a Depository Agreement dated as of June 29, 1998."

                  8. Insert the following at the end of Section 4.01(a):

                  "On and after the Exchange  Effective  Date,  the Trustee will
take such action as may be reasonably required to cause the Depository to remove
the Class A  Certificates  from the  book-



                                      -6-
<PAGE>


entry  system  and  to  cause  the  Class  A  Certificates  to  become  Physical
Certificates, registered in the name of the Trustee, on behalf of the holders of
the New  Certificates.  The Trustee  shall take such action as may be reasonably
required to cause the Depository to accept the New Certificates  (other than the
Class R-3 Certificates) for trading."

                  9. Insert the following immediately following Section 4.01:

                  "Section 4.01A.   The New Certificates

                  (a)  References to "REMIC I or REMIC II" shall all mean "REMIC
I,  REMIC II or REMIC  III" and  references  to "REMIC I and REMIC II" shall all
mean "REMIC I, REMIC II and REMIC III" except  with  respect to Section  4.01(h)
and 7.01(b).

                  (b)  The  Holder  of  the  Class  R-3  Certificate  is  hereby
designated  as the Tax  Matters  Person  for REMIC  III.  The  Trustee is hereby
designated and appointed as the agent of such Tax Matters Person.  Any Holder of
a Class R-3  Certificate  with respect to REMIC III will by  acceptance  thereof
appoint the Trustee as agent and  attorney-in-fact  for the purpose of acting as
Tax  Matters  Person  during  such  time as the  Trustee  does  not own any such
Residual Certificate.

                  (c) REMIC III will be evidenced by the New Certificates.

                  (d) The New Certificates shall have the designations,  initial
Original  Certificate  Principal Balances and Certificate Rates set forth below.
Immediately  following  the  July 2,  1998  Distribution  Date  and the  related
Supplemental  Distribution  Date,  if any,  the Original  Certificate  Principal
Balance  of  each  Class  of New  Certificates  shall  be the  initial  Original
Certificate  Principal  Balance set forth below reduced,  by its approximate pro
rata share, based on Certificate Principal Balances of the New Certificates,  of
an amount equal to the principal  payments paid on the Class A  Certificates  on
the July 2, 1998  Distribution  Date and the related  Supplemental  Distribution
Date, if any.  Notwithstanding the foregoing,  the Certificate Principal Balance
of each Class of New Certificates  (other than the Class R-3 Certificate)  shall
be rounded  down to the  nearest  dollar  and any  excess  shall be added to the
Certificate Principal Balance of the Class R-3 Certificate.

                            Original Certificate   Certificate
             Designation      Principal Balance       Rate
             -----------      -----------------       ----
                 A-1             $59,750,000.00       (1)
                 A-2             $65,000,000.00       (1)
                 A-3             $45,622,942.00       (1)
                 A-4             $25,000,000.00       (1)
                 A-5              $9,999,900.00       (1)
                 R-3                    $100.76       (1)
- --------------

                                      -7-
<PAGE>


(1)      The  lesser of (x) 6.75% and (y) the  weighted  average  of the  Pooled
         Security  Interest Rates,  but in no event greater than (z) a fraction,
         expressed  as a  percentage,  the  numerator  of which is the  interest
         distribution  on the  Pooled  Securities  for  which  both  the  Pooled
         Security   distribution  and  the  Pooled  Security  Distribution  Date
         Information has been received by the Trustee by the Determination  Time
         multiplied  by twelve  and the  denominator  of which is the  aggregate
         Certificate  Principal  Balance of all of the Certificates  (other than
         the Class A and Class PO Certificates).  Interest shall start to accrue
         on the New Certificates on June 1, 1998.

                  (e) The New  Certificates  shall be substantially in the forms
set forth in  Exhibits P through  Exhibit U hereto.  On original  issuance,  the
Trustee shall sign, countersign and deliver them at the direction of the Class A
Certificateholder.  The Class R-3  Certificates  shall be issued in certificated
fully-registered  form  in a  denomination  equal  to its  Original  Certificate
Balance.

                  (f) The Exchange  Effective  Date is hereby  designated as the
"startup" day of REMIC III within the meaning of Section 860G(a)(9) of the Code.
The Trustee  shall not accept any  contribution  to REMIC III after such startup
day without receipt of a REMIC Opinion."

                  10.  Insert  the  following   immediately   following  Section
8.11(e):

                  (f) Any  rights  accruing  to the  Class A  Certificateholders
[other than as specifically otherwise provided herein] shall be allocated to the
holders of the New  Certificates,  pro rata,  based on  outstanding  Certificate
Principal Balance.

                  11. Except as expressly amended hereby, all of the provisions,
covenants, terms and conditions of the Agreement shall continue to be, and shall
remain, in full force and effect in accordance with its terms.

                  12. THIS AMENDMENT AND THE NEW CERTIFICATES SHALL BE CONSTRUED
IN  ACCORDANCE  WITH THE LAWS OF THE STATE OF NEW YORK  APPLICABLE TO AGREEMENTS
MADE AND TO BE PERFORMED IN SAID STATE  (WITHOUT  REFERENCE TO THE  CONFLICTS OF
LAW PROVISIONS OF SUCH STATE),  AND THE OBLIGATIONS,  RIGHTS AND REMEDIES OF THE
PARTIES HEREUNDER AND THE HOLDERS OF THE NEW CERTIFICATES SHALL BE DETERMINED IN
ACCORDANCE WITH SUCH LAWS.

                  13.  This  Amendment  may be  executed  simultaneously  in any
number  of  counterparts,  each of which  counterparts  shall be deemed to be an
original,   and  such  counterparts  shall  constitute  but  one  and  the  same
instrument.


                                      -8-
<PAGE>

                  IN WITNESS  WHEREOF,  the Seller and the  Trustee  have caused
their names to be signed hereto by their  respective duly  authorized  officers,
all as of the day and year first above written.

                     STRUCTURED ASSET MORTGAGE INVESTMENTS INC., as Seller


                     By:
                          Name:
                          Title:



                     THE BANK OF NEW YORK, as Trustee


                     By:
                          Name:
                          Title:



                                      -9-
<PAGE>

     THIS  CERTIFICATE  DOES NOT REPRESENT AN OBLIGATION  OF, OR AN INTEREST IN,
STRUCTURED  ASSET  MORTGAGE  INVESTMENTS  INC.,  FORMERLY  KNOWN AS BEAR STEARNS
MORTGAGE  SECURITIES  INC.,  OR THE  TRUSTEE  REFERRED  TO BELOW OR ANY OF THEIR
RESPECTIVE  AFFILIATES  AND IS NOT  GUARANTEED  OR INSURED  BY ANY  GOVERNMENTAL
AGENCY OR INSTRUMENTALITY.
     THIS  CERTIFICATE  IS A  "REGULAR  INTEREST"  IN A  "REAL  ESTATE  MORTGAGE
INVESTMENT CONDUIT" (A "REMIC"),  AS THOSE TERMS ARE DEFINED,  RESPECTIVELY,  IN
SECTIONS  860G AND 860D OF THE INTERNAL  REVENUE  CODE OF 1986,  AS AMENDED (THE
"CODE").
     THE CERTIFICATE  PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE DECREASED BY
THE PRINCIPAL  PAYMENTS HEREON.  ACCORDINGLY,  FOLLOWING THE INITIAL ISSUANCE OF
THE CERTIFICATES,  THE CERTIFICATE PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE
DIFFERENT FROM THE DENOMINATION  SHOWN BELOW.  ANYONE ACQUIRING THIS CERTIFICATE
MAY  ASCERTAIN  ITS  CURRENT  CERTIFICATE  PRINCIPAL  BALANCE  BY INQUIRY OF THE
TRUSTEE NAMED HEREIN.
     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY  TRUST  COMPANY  TO THE  TRUSTEE  OR ITS  AGENT FOR  REGISTRATION  OF
TRANSFER,  EXCHANGE OR PAYMENT,  AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME  OF  CEDE  &  CO.  OR  SUCH  OTHER  NAME  AS  REQUESTED  BY  AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO CEDE &
CO.,  ANY  TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
ANY PERSON IS WRONGFUL  SINCE THE  REGISTERED  OWNER HEREOF,  CEDE & CO., HAS AN
INTEREST HEREIN.
     THIS  CERTIFICATE  MAY  NOT  BE  ACQUIRED  DIRECTLY  OR  INDIRECTLY  BY,  A
TRANSFEREE  UNLESS THE PROPOSED  TRANSFEREE  CERTIFIES TO THE TRUSTEE THAT IT IS
NOT ACQUIRING SUCH CERTIFICATES DIRECTLY OR INDIRECTLY FOR, ON BEHALF OF OR WITH
THE ASSETS OF, AN EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT ARRANGEMENT WHICH IS
SUBJECT TO TITLE I OF THE EMPLOYEE  RETIREMENT  INCOME  SECURITY ACT OF 1974, AS
AMENDED,  AND/OR SECTION 4975 OF THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED,
OR IS AN  INSURANCE  COMPANY AND THE SOURCE OF FUNDS TO BE USED BY IT TO PAY THE
PURCHASE PRICE OF THE CERTIFICATES IS FUNDS HELD BY IT IN AN "INSURANCE  COMPANY
GENERAL  ACCOUNT" (AS DEFINED IN SECTION V(E) OF  PROHIBITED  TRANSACTION  CLASS
EXEMPTION  95-60 ("PTCE  95-60") AS PUBLISHED  IN 60 FED.  REG.  35925 (JULY 12,
1995)) AND IT REASONABLY BELIEVES, AS OF ACQUISITION, THE AMOUNT OF RESERVES AND
LIABILITIES FOR THE GENERAL  ACCOUNT  CONTRACTS HELD BY OR ON BEHALF OF ANY PLAN
(AND ANY OTHER  PLAN OF THE SAME  EMPLOYER  OR ITS  AFFILIATES  (AS  DEFINED  IN
SECTION V(A)(1) OF PTCE 95-60)) OR BY THE SAME EMPLOYEE  ORGANIZATION)  DOES NOT
EXCEED 10% OF THE TOTAL  RESERVE AND  LIABILITIES  OF SUCH GENERAL  ACCOUNT PLUS
SURPLUS (SUCH  DETERMINATION  TO BE MADE IN ACCORDANCE WITH SECTION I(A) OF PTCE
95-60), WHICH WILL BE DEEMED REPRESENTED BY AN OWNER OF A BOOK-ENTRY CERTIFICATE
OR GLOBAL  CERTIFICATE AND WILL BE EVIDENCED BY A REPRESENTATION  TO SUCH EFFECT
BY OR ON BEHALF OF A HOLDER OF A CERTIFICATE IN PHYSICAL FORM.


<TABLE>
<CAPTION>
<S> <C> 
                            PASS-THROUGH CERTIFICATE,
                                  SERIES 1998-2
No. A-1-__
evidencing a beneficial interest in a Trust consisting primarily of the Pooled 
Securities (as defined below) sold by

                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                (formerly Bear Stearns Mortgage Securities Inc.)

                                                                                                 CUSIP No. 073914 F24
First Distribution Date          :    August 3, 1998        Class                            :           A-1
Assumed Final Distribution Date  :    May 2, 2030           Original Certificate Principal
                                                            Balance of this Certificate
                                                            ("Denomination")                 :     $ 59,750,000.00
Certificate Rate                 :    Variable              Approximate Class Original
                                                            Certificate Principal Balance    :     $ 59,750,000.00

THIS CERTIFIES THAT                   Cede & Co.
is the  registered  owner of the  Percentage  Interest  evidenced  hereby in the
beneficial  ownership  interest  of  Certificates  of the  same  Class  as  this
Certificate in a trust (the  "Trust"),  the assets of which consist of a pool of
96 classes of mortgage backed securities (the "Pooled  Securities"),  the assets
of which consist primarily of (i) conventional,  fixed rate, first lien mortgage
loans secured by one- to four-family  residences or cooperative loans secured by
shares  in  cooperative   corporations   ("Mortgage  Loans")  or  (ii)  mortgage
certificates representing interests in 48 trusts or trust estates, the assets of
which  consist  primarily of Mortgage  Loans sold by Structured  Asset  Mortgage
Investments Inc.,  formerly known as Bear Stearns Mortgage  Securities Inc. (the
"Seller")  to the  Trust.  The  Pooled  Securities  were  sold to the  Seller by
SunAmerica  Inc.,  a  Maryland  corporation,   its  subsidiary  SunAmerica  Life
Insurance  Company,  an  Arizona  corporation,   and  certain  of  the  latter's
subsidiaries.  The Trust was created pursuant to the Pooling  Agreement dated as
of March 1, 1998 (the "Agreement"), by and between the Seller, as seller and The
Bank of New York,  as  trustee  (the  "Trustee")  a summary  of  certain  of the
pertinent  provisions  of which is set  forth  hereinafter.  To the  extent  not
defined herein, capitalized terms used herein shall have the meaning ascribed to
them in the  Agreement.  This  Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement, to which Agreement the Holder
of this Certificate by virtue of its acceptance hereof assents and by which such
Holder is bound.
         The Holder of this  Certificate will be entitled to receive interest on
its  Certificate  Principal  Balance  on  each  monthly  Distribution  Date at a
variable  per annum  interest  rate equal to the lesser of (x) 6.75% and (y) the
weighted average of the Pooled Security  Interest Rates, but in no event greater
than (z) a fraction,  expressed as a  percentage,  the numerator of which is the
interest  distribution  on the  Pooled  Securities  for  which  both the  Pooled
Security   distribution  and  the  related  Pooled  Security  Distribution  Date
Information  have been  received  by the Trustee by the times  described  in the
Agreement,  multiplied by twelve,  and the denominator of which is the aggregate
Certificate  Principal  Balance of the Certificates  (other than the Class A and
Class PO Certificates). The Assumed Final Distribution Date is approximately one
month after the Pooled Security  Distribution  Date on which the final scheduled
distribution on the last to mature of the related Pooled Securities is scheduled
to be made.  Since the rate of payment of principal on the  Underlying  Mortgage
Loans can be expected to exceed the rate of payments  used in  calculating  each
such final scheduled  distribution,  the date of the final  distribution on each
class of  Certificates  is expected to be  earlier,  and could be  substantially
earlier, than the Assumed Final Distribution Date.
        Distributions  on this  Certificate will be made by the Trustee by check
mailed to the  address of the Person  entitled  thereto as such name and address
shall  appear on the  Certificate  Register  or, if such  Person so  requests by
notifying  the  Trustee in writing as  specified  in the  Agreement  and if such
Person  holds  Certificates  with an  initial  aggregate  Certificate  Principal
Balance of not less than  $1,000,000,  in immediately  available  funds (by wire
transfer or otherwise) to the account specified in writing by such Person to the
Trustee.  Notwithstanding  the above, the final distribution on this Certificate
will  be  made  after  due  notice  by the  Trustee  of  the  pendency  of  such
distribution and only upon presentation and surrender of this Certificate at the
office or agency  appointed  by the Trustee for that purpose and  designated  in
such notice.
       Unless this Certificate has been countersigned by an authorized signatory
of the Trustee by manual  signature,  this Certificate  shall not be entitled to
any benefit under the Agreement, or be valid for any purpose.
      *To be reduced  generally by the pro rata share of this Class based on the
Class A-1, Class A-2, Class A-3, Class A-4, Class A-5 and Class R-3  Certificate
Principal   Balances  of   distributions  of  principal  made  on  the  Class  A
Certificates  on the  Distribution  Date and related  Supplemental  Distribution
Date, if any, deemed to be in June 1998.
      IN WITNESS  WHEREOF,  the Trustee has caused this  Certificate  to be duly
executed.
Dated:  ______________

                                                       THE BANK OF NEW YORK,
Countersigned:                                         Not in its individual capacity but solely as Trustee


By: _____________________________________________
Authorized signatory of The Bank of New York           By: _____________________________
not in its individual capacity but solely as Trustee   AUTHORIZED OFFICER
</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>     <C>   
                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                    PASS-THROUGH CERTIFICATES, SERIES 1998-2



     This Certificate is one of a duly authorized                     The Certificates are issuable only as          
issue of Certificates designated as set forth on                 registered Certificates without coupons in the      
the face hereof (the "Certificates"), issued in                  Classes and denominations specified in the          
multiple Classes. The Certificates, in the                       Agreement. As provided in the Agreement and         
aggregate, evidence the entire beneficial                        subject to certain limitations thereinset forth,    
ownership interest in the Trust formed pursuant to               this Certificate is exchangeable for one or more    
the Agreement.                                                   new Certificates evidencing the same Class and in   
                                                                 the same aggregate Percentage Interest, as          
     The Certificateholder, by its acceptance of                 requested by the Holder surrendering the same.      
this Certificate, agrees that it will look solely                                                                    
to the Trust for payment hereunder and that the                       No service charge will be made to the             
Trustee is not liable to the Certificateholders                  Certificateholders for any such registration of        
for any amount payable under this Certificate or the             transfer, but the Trustee may require payment of a     
Agreement or, except as expressly provided in the                sum sufficient to cover any tax or other               
Agreement, subject to any liability under the Agreement.         governmental charge payable in connection              
                                                                 therewith. The Seller, the Trustee and any agent       
     This Certificate does not purport to                        of them may treat the Person in whosename the          
summarize the Agreement and reference is made to                 Certificate is registered as the owner hereof for      
the Agreement for the interests,  right and                      all purposes, and neither the Tristee nor any such     
limitationa of rights,  benefits,  obligations and               agent shall be affected by notice to the contrary.     
duties evidenced hereby,  and the rights,  duties                                                                       
and immunities of the trustee.                                        The obligations created by the Agreement and          
                                                                 the Trust created thereby (other than the                  
     The Agreement permits, with certain                         obligations to make payments and to send certain           
exceptions therein provided, the amendment thereof               notices to Certificateholders as set forth in the          
and the modification of the rights of the                        Agreement) shall terminate upon (i) the optional           
Certificateholders under the Agreement from time                 repurchase by the party named in the Agreement of          
to time by the Seller and the Trustee with the                   all the Pooled Securities in accordance with the           
consent of the Majority Certificateholders. Any                  terms of the Agreement, or (ii) the payment (or            
such consent by the Holder of this Certificate                   provision for payment) to the Certificateholders           
shall be conclusive and binding on such Holder and               of all amounts held by or on behalf of the Trustee         
upon all future Holders of this Certificate and of               and required to be paid to them under the                  
any Certificate issued upon the transfer hereof or               Agreement on the Final Distribution Date following         
in lieu hereof whether or not notation of such                   the final distribution to be made on the Pooled            
consent is made upon this Certificate. The                       Securities. Such optional repurchase may be made           
Agreement also permits the amendment thereof, in                 only on any Distribution Date upon the                     
certain limited circumstances, without the consent               determination, based upon an opinion of counsel,           
of the Holders of any of the Certificates.                       that the REMIC status of any of REMIC I, REMIC II          
                                                                 or REMIC III has been lost or that a substantial           
     As provided in the Agreement and subject to                 risk exists that such status will be lost for the          
certain limitations therein set forth, the                       then current year. In no event, however, will the          
transfer of this Certificate is registrable with                 Trust created by the Agreement continue beyond the         
the Trustee upon surrender of this Certificate for               expiration of 21 years after the death of certain          
registration of transfer at the offices or                       persons identified in the Agreement.                       
agencies maintained by the Trustee for such                      
purpose duly endorsed by, or accompanied by a
written instrument of transfer in form
satisfactory to the Trustee duly executed by the
Holder hereof or such Holder's attorney duly
authorized in writing, and thereupon one or more
new Certificates in authorized denominations
representing a like Class and aggregate Percentage
Interest will be issued to the designated
transferee.
</TABLE>



                                   ASSIGNMENT

      FOR  VALUE  RECEIVED,  the  undersigned  hereby  sell(s),   assign(s)  and
transfer(s) unto 
                ---------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
 (Please print or typewrite name and address including postal zip code assignee)

the within  Certificate  and hereby  authorizes the transfer of  registration of
such interest to the assignee on the Certificate Register of the Trust.

      I (We)  further  direct the Trustee to issue a new  Certificate  of a like
denomination and Class, to the above named assignee and deliver such Certificate
to the following address:

Dated:
                                         ---------------------------------------
                                         Signature by or on behalf of assignor


                                         ---------------------------------------
                                         Signature Guaranteed

                            DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately
available funds to______________________________________________________________
________________________________________________________________________________

for  the account of ____________________________________________________________

account number _____________, or, if mailed by check to_________________________

Applicable statements should be mailed to_______________________________________
This information is provided by_________________________________________________
the assignee named above, or____________________________________________________
as its agent.

692291v2
                                      P-2
<PAGE>


     THIS  CERTIFICATE  DOES NOT REPRESENT AN OBLIGATION  OF, OR AN INTEREST IN,
STRUCTURED  ASSET  MORTGAGE  INVESTMENTS  INC.,  FORMERLY  KNOWN AS BEAR STEARNS
MORTGAGE  SECURITIES  INC.,  OR THE  TRUSTEE  REFERRED  TO BELOW OR ANY OF THEIR
RESPECTIVE  AFFILIATES  AND IS NOT  GUARANTEED  OR INSURED  BY ANY  GOVERNMENTAL
AGENCY OR INSTRUMENTALITY.
     THIS  CERTIFICATE  IS A  "REGULAR  INTEREST"  IN A  "REAL  ESTATE  MORTGAGE
INVESTMENT CONDUIT" (A "REMIC"),  AS THOSE TERMS ARE DEFINED,  RESPECTIVELY,  IN
SECTIONS  860G AND 860D OF THE INTERNAL  REVENUE  CODE OF 1986,  AS AMENDED (THE
"CODE").
     THE CERTIFICATE  PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE DECREASED BY
THE PRINCIPAL  PAYMENTS HEREON.  ACCORDINGLY,  FOLLOWING THE INITIAL ISSUANCE OF
THE CERTIFICATES,  THE CERTIFICATE PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE
DIFFERENT FROM THE DENOMINATION  SHOWN BELOW.  ANYONE ACQUIRING THIS CERTIFICATE
MAY  ASCERTAIN  ITS  CURRENT  CERTIFICATE  PRINCIPAL  BALANCE  BY INQUIRY OF THE
TRUSTEE NAMED HEREIN.
     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY  TRUST  COMPANY  TO THE  TRUSTEE  OR ITS  AGENT FOR  REGISTRATION  OF
TRANSFER,  EXCHANGE OR PAYMENT,  AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME  OF  CEDE  &  CO.  OR  SUCH  OTHER  NAME  AS  REQUESTED  BY  AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO CEDE &
CO.,  ANY  TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
ANY PERSON IS WRONGFUL  SINCE THE  REGISTERED  OWNER HEREOF,  CEDE & CO., HAS AN
INTEREST HEREIN.
     THIS  CERTIFICATE  MAY  NOT  BE  ACQUIRED  DIRECTLY  OR  INDIRECTLY  BY,  A
TRANSFEREE  UNLESS THE PROPOSED  TRANSFEREE  CERTIFIES TO THE TRUSTEE THAT IT IS
NOT ACQUIRING SUCH CERTIFICATES DIRECTLY OR INDIRECTLY FOR, ON BEHALF OF OR WITH
THE ASSETS OF, AN EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT ARRANGEMENT WHICH IS
SUBJECT TO TITLE I OF THE EMPLOYEE  RETIREMENT  INCOME  SECURITY ACT OF 1974, AS
AMENDED,  AND/OR SECTION 4975 OF THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED,
OR IS AN  INSURANCE  COMPANY AND THE SOURCE OF FUNDS TO BE USED BY IT TO PAY THE
PURCHASE PRICE OF THE CERTIFICATES IS FUNDS HELD BY IT IN AN "INSURANCE  COMPANY
GENERAL  ACCOUNT" (AS DEFINED IN SECTION V(E) OF  PROHIBITED  TRANSACTION  CLASS
EXEMPTION  95-60 ("PTCE  95-60") AS PUBLISHED  IN 60 FED.  REG.  35925 (JULY 12,
1995)) AND IT REASONABLY BELIEVES, AS OF ACQUISITION, THE AMOUNT OF RESERVES AND
LIABILITIES FOR THE GENERAL  ACCOUNT  CONTRACTS HELD BY OR ON BEHALF OF ANY PLAN
(AND ANY OTHER  PLAN OF THE SAME  EMPLOYER  OR ITS  AFFILIATES  (AS  DEFINED  IN
SECTION V(A)(1) OF PTCE 95-60)) OR BY THE SAME EMPLOYEE  ORGANIZATION)  DOES NOT
EXCEED 10% OF THE TOTAL  RESERVE AND  LIABILITIES  OF SUCH GENERAL  ACCOUNT PLUS
SURPLUS (SUCH  DETERMINATION  TO BE MADE IN ACCORDANCE WITH SECTION I(A) OF PTCE
95-60), WHICH WILL BE DEEMED REPRESENTED BY AN OWNER OF A BOOK-ENTRY CERTIFICATE
OR GLOBAL  CERTIFICATE AND WILL BE EVIDENCED BY A REPRESENTATION  TO SUCH EFFECT
BY OR ON BEHALF OF A HOLDER OF A CERTIFICATE IN PHYSICAL FORM.

                            PASS-THROUGH CERTIFICATE,
                                  SERIES 1998-2
No. A-2-__
 evidencing a beneficial interest in a Trust consisting primarily of the Pooled
 Securities (as defined below) sold by

<TABLE>
<CAPTION>
<S>     <C>    
                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                (formerly Bear Stearns Mortgage Securities Inc.)
                                                                                          CUSIP No. 073914 F32
First Distribution Date          :  August 3, 1998    Class                            :        A-2
Assumed Final Distribution Date  :  May 2, 2030       Original Certificate Principal
                                                      Balance of this Certificate
                                                      ("Denomination")                 :  $ 65,000,000.00
Certificate Rate                 :  Variable          Approximate Class Original
                                                      Certificate Principal Balance    :  $ 65,000,000.00

THIS CERTIFIES THAT                   Cede & Co.
is the  registered  owner of the  Percentage  Interest  evidenced  hereby in the
beneficial  ownership  interest  of  Certificates  of the  same  Class  as  this
Certificate in a trust (the  "Trust"),  the assets of which consist of a pool of
96 classes of mortgage backed securities (the "Pooled  Securities"),  the assets
of which consist primarily of (i) conventional,  fixed rate, first lien mortgage
loans secured by one- to four-family  residences or cooperative loans secured by
shares  in  cooperative   corporations   ("Mortgage  Loans")  or  (ii)  mortgage
certificates representing interests in 48 trusts or trust estates, the assets of
which  consist  primarily of Mortgage  Loans sold by Structured  Asset  Mortgage
Investments Inc.,  formerly known as Bear Stearns Mortgage  Securities Inc. (the
"Seller")  to the  Trust.  The  Pooled  Securities  were  sold to the  Seller by
SunAmerica  Inc.,  a  Maryland  corporation,   its  subsidiary  SunAmerica  Life
Insurance  Company,  an  Arizona  corporation,   and  certain  of  the  latter's
subsidiaries.  The Trust was created pursuant to the Pooling  Agreement dated as
of March 1, 1998 (the "Agreement"), by and between the Seller, as seller and The
Bank of New York,  as  trustee  (the  "Trustee")  a summary  of  certain  of the
pertinent  provisions  of which is set  forth  hereinafter.  To the  extent  not
defined herein, capitalized terms used herein shall have the meaning ascribed to
them in the  Agreement.  This  Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement, to which Agreement the Holder
of this Certificate by virtue of its acceptance hereof assents and by which such
Holder is bound.

The Holder of this  Certificate  will be  entitled  to receive  interest  on its
Certificate  Principal  Balance on each monthly  Distribution Date at a variable
per annum  interest  rate equal to the lesser of (x) 6.75% and (y) the  weighted
average of the Pooled Security  Interest Rates, but in no event greater than (z)
a fraction,  expressed as a  percentage,  the numerator of which is the interest
distribution  on the  Pooled  Securities  for  which  both the  Pooled  Security
distribution and the related Pooled Security  Distribution Date Information have
been received by the Trustee by the times described in the Agreement, multiplied
by twelve, and the denominator of which is the aggregate  Certificate  Principal
Balance of the Certificates  (other than the Class A and Class PO Certificates).
The Assumed Final  Distribution Date is approximately one month after the Pooled
Security Distribution Date on which the final scheduled distribution on the last
to mature of the related  Pooled  Securities is scheduled to be made.  Since the
rate of payment of principal on the Underlying Mortgage Loans can be expected to
exceed  the rate of  payments  used in  calculating  each such  final  scheduled
distribution,  the date of the final  distribution on each class of Certificates
is expected to be earlier, and could be substantially  earlier, than the Assumed
Final Distribution  Date.  Distributions on this Certificate will be made by the
Trustee by check  mailed to the address of the Person  entitled  thereto as such
name and address shall appear on the Certificate  Register or, if such Person so
requests by notifying  the Trustee in writing as specified in the  Agreement and
if  such  Person  holds  Certificates  with  an  initial  aggregate  Certificate
Principal  Balance of not less than $1,000,000,  in immediately  available funds
(by wire  transfer or  otherwise)  to the account  specified  in writing by such
Person to the Trustee. Notwithstanding the above, the final distribution on this
Certificate will be made after due notice by the Trustee of the pendency of such
distribution and only upon presentation and surrender of this Certificate at the
office or agency  appointed  by the Trustee for that purpose and  designated  in
such notice.  Unless this  Certificate has been  countersigned  by an authorized
signatory  of the Trustee by manual  signature,  this  Certificate  shall not be
entitled to any benefit under the Agreement, or be valid for any purpose. *To be
reduced  generally  by the pro rata share of this Class  based on the Class A-1,
Class A-2, Class A-3, Class A-4, Class A-5 and Class R-3  Certificate  Principal
Balances of  distributions  of principal made on the Class A Certificates on the
Distribution Date and related Supplemental  Distribution Date, if any, deemed to
be in June 1998. IN WITNESS WHEREOF,  the Trustee has caused this Certificate to
be duly executed.
                                                      
Dated:  ______________                  
                                             
                                                             THE BANK OF NEW YORK,
Countersigned:                                               Not in its individual capacity but solely as Trustee


By: _____________________________________________
Authorized signatory of The Bank of New York                 By: _____________________________
not in its individual capacity but solely as Trustee         AUTHORIZED OFFICER
</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>     <C>    
                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                    PASS-THROUGH CERTIFICATES, SERIES 1998-2



     This Certificate is one of a duly authorized                     The Certificates are issuable only as          
issue of Certificates designated as set forth on                 registered Certificates without coupons in the      
the face hereof (the "Certificates"), issued in                  Classes and denominations specified in the          
multiple Classes. The Certificates, in the                       Agreement. As provided in the Agreement and         
aggregate, evidence the entire beneficial                        subject to certain limitations thereinset forth,    
ownership interest in the Trust formed pursuant to               this Certificate is exchangeable for one or more    
the Agreement.                                                   new Certificates evidencing the same Class and in   
                                                                 the same aggregate Percentage Interest, as          
     The Certificateholder, by its acceptance of                 requested by the Holder surrendering the same.      
this Certificate, agrees that it will look solely                                                                    
to the Trust for payment hereunder and that the                       No service charge will be made to the             
Trustee is not liable to the Certificateholders                  Certificateholders for any such registration of        
for any amount payable under this Certificate or the             transfer, but the Trustee may require payment of a     
Agreement or, except as expressly provided in the                sum sufficient to cover any tax or other               
Agreement, subject to any liability under the Agreement.         governmental charge payable in connection              
                                                                 therewith. The Seller, the Trustee and any agent       
     This Certificate does not purport to                        of them may treat the Person in whosename the          
summarize the Agreement and reference is made to                 Certificate is registered as the owner hereof for      
the Agreement for the interests,  right and                      all purposes, and neither the Tristee nor any such     
limitationa of rights,  benefits,  obligations and               agent shall be affected by notice to the contrary.     
duties evidenced hereby,  and the rights,  duties                                                                       
and immunities of the trustee.                                        The obligations created by the Agreement and          
                                                                 the Trust created thereby (other than the                  
     The Agreement permits, with certain                         obligations to make payments and to send certain           
exceptions therein provided, the amendment thereof               notices to Certificateholders as set forth in the          
and the modification of the rights of the                        Agreement) shall terminate upon (i) the optional           
Certificateholders under the Agreement from time                 repurchase by the party named in the Agreement of          
to time by the Seller and the Trustee with the                   all the Pooled Securities in accordance with the           
consent of the Majority Certificateholders. Any                  terms of the Agreement, or (ii) the payment (or            
such consent by the Holder of this Certificate                   provision for payment) to the Certificateholders           
shall be conclusive and binding on such Holder and               of all amounts held by or on behalf of the Trustee         
upon all future Holders of this Certificate and of               and required to be paid to them under the                  
any Certificate issued upon the transfer hereof or               Agreement on the Final Distribution Date following         
in lieu hereof whether or not notation of such                   the final distribution to be made on the Pooled            
consent is made upon this Certificate. The                       Securities. Such optional repurchase may be made           
Agreement also permits the amendment thereof, in                 only on any Distribution Date upon the                     
certain limited circumstances, without the consent               determination, based upon an opinion of counsel,           
of the Holders of any of the Certificates.                       that the REMIC status of any of REMIC I, REMIC II          
                                                                 or REMIC III has been lost or that a substantial           
     As provided in the Agreement and subject to                 risk exists that such status will be lost for the          
certain limitations therein set forth, the                       then current year. In no event, however, will the          
transfer of this Certificate is registrable with                 Trust created by the Agreement continue beyond the         
the Trustee upon surrender of this Certificate for               expiration of 21 years after the death of certain          
registration of transfer at the offices or                       persons identified in the Agreement.                       
agencies maintained by the Trustee for such                      
purpose duly endorsed by, or accompanied by a
written instrument of transfer in form
satisfactory to the Trustee duly executed by the
Holder hereof or such Holder's attorney duly
authorized in writing, and thereupon one or more
new Certificates in authorized denominations
representing a like Class and aggregate Percentage
Interest will be issued to the designated
transferee.

</TABLE>


                                   ASSIGNMENT

      FOR  VALUE  RECEIVED,  the  undersigned  hereby  sell(s),   assign(s)  and
transfer(s) unto 
                ---------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
 (Please print or typewrite name and address including postal zip code assignee)

the within  Certificate  and hereby  authorizes the transfer of  registration of
such interest to the assignee on the Certificate Register of the Trust.

      I (We)  further  direct the Trustee to issue a new  Certificate  of a like
denomination and Class, to the above named assignee and deliver such Certificate
to the following address:

Dated:
                                         ---------------------------------------
                                         Signature by or on behalf of assignor


                                         ---------------------------------------
                                         Signature Guaranteed

                            DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately
available funds to______________________________________________________________
________________________________________________________________________________

for  the account of ____________________________________________________________

account number _____________, or, if mailed by check to_________________________

Applicable statements should be mailed to_______________________________________
This information is provided by_________________________________________________
the assignee named above, or____________________________________________________
as its agent.

                                       Q-2

<PAGE>

     THIS  CERTIFICATE  DOES NOT REPRESENT AN OBLIGATION  OF, OR AN INTEREST IN,
STRUCTURED  ASSET  MORTGAGE  INVESTMENTS  INC.,  FORMERLY  KNOWN AS BEAR STEARNS
MORTGAGE  SECURITIES  INC.,  OR THE  TRUSTEE  REFERRED  TO BELOW OR ANY OF THEIR
RESPECTIVE  AFFILIATES  AND IS NOT  GUARANTEED  OR INSURED  BY ANY  GOVERNMENTAL
AGENCY OR INSTRUMENTALITY.
     THIS  CERTIFICATE  IS A  "REGULAR  INTEREST"  IN A  "REAL  ESTATE  MORTGAGE
INVESTMENT CONDUIT" (A "REMIC"),  AS THOSE TERMS ARE DEFINED,  RESPECTIVELY,  IN
SECTIONS  860G AND 860D OF THE INTERNAL  REVENUE  CODE OF 1986,  AS AMENDED (THE
"CODE").
     THE CERTIFICATE  PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE DECREASED BY
THE PRINCIPAL  PAYMENTS HEREON.  ACCORDINGLY,  FOLLOWING THE INITIAL ISSUANCE OF
THE CERTIFICATES,  THE CERTIFICATE PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE
DIFFERENT FROM THE DENOMINATION  SHOWN BELOW.  ANYONE ACQUIRING THIS CERTIFICATE
MAY  ASCERTAIN  ITS  CURRENT  CERTIFICATE  PRINCIPAL  BALANCE  BY INQUIRY OF THE
TRUSTEE NAMED HEREIN.
     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY  TRUST  COMPANY  TO THE  TRUSTEE  OR ITS  AGENT FOR  REGISTRATION  OF
TRANSFER,  EXCHANGE OR PAYMENT,  AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME  OF  CEDE  &  CO.  OR  SUCH  OTHER  NAME  AS  REQUESTED  BY  AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO CEDE &
CO.,  ANY  TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
ANY PERSON IS WRONGFUL  SINCE THE  REGISTERED  OWNER HEREOF,  CEDE & CO., HAS AN
INTEREST HEREIN.
     THIS  CERTIFICATE  MAY  NOT  BE  ACQUIRED  DIRECTLY  OR  INDIRECTLY  BY,  A
TRANSFEREE  UNLESS THE PROPOSED  TRANSFEREE  CERTIFIES TO THE TRUSTEE THAT IT IS
NOT ACQUIRING SUCH CERTIFICATES DIRECTLY OR INDIRECTLY FOR, ON BEHALF OF OR WITH
THE ASSETS OF, AN EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT ARRANGEMENT WHICH IS
SUBJECT TO TITLE I OF THE EMPLOYEE  RETIREMENT  INCOME  SECURITY ACT OF 1974, AS
AMENDED,  AND/OR SECTION 4975 OF THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED,
OR IS AN  INSURANCE  COMPANY AND THE SOURCE OF FUNDS TO BE USED BY IT TO PAY THE
PURCHASE PRICE OF THE CERTIFICATES IS FUNDS HELD BY IT IN AN "INSURANCE  COMPANY
GENERAL  ACCOUNT" (AS DEFINED IN SECTION V(E) OF  PROHIBITED  TRANSACTION  CLASS
EXEMPTION  95-60 ("PTCE  95-60") AS PUBLISHED  IN 60 FED.  REG.  35925 (JULY 12,
1995)) AND IT REASONABLY BELIEVES, AS OF ACQUISITION, THE AMOUNT OF RESERVES AND
LIABILITIES FOR THE GENERAL  ACCOUNT  CONTRACTS HELD BY OR ON BEHALF OF ANY PLAN
(AND ANY OTHER  PLAN OF THE SAME  EMPLOYER  OR ITS  AFFILIATES  (AS  DEFINED  IN
SECTION V(A)(1) OF PTCE 95-60)) OR BY THE SAME EMPLOYEE  ORGANIZATION)  DOES NOT
EXCEED 10% OF THE TOTAL  RESERVE AND  LIABILITIES  OF SUCH GENERAL  ACCOUNT PLUS
SURPLUS (SUCH  DETERMINATION  TO BE MADE IN ACCORDANCE WITH SECTION I(A) OF PTCE
95-60), WHICH WILL BE DEEMED REPRESENTED BY AN OWNER OF A BOOK-ENTRY CERTIFICATE
OR GLOBAL  CERTIFICATE AND WILL BE EVIDENCED BY A REPRESENTATION  TO SUCH EFFECT
BY OR ON BEHALF OF A HOLDER OF A CERTIFICATE IN PHYSICAL FORM.

<TABLE>
<CAPTION>
<S>     <C>  

                            PASS-THROUGH CERTIFICATE,
                                  SERIES 1998-2
No. A-3-__
evidencing a beneficial interest in a Trust consisting primarily of the Pooled
Securities (as defined below) sold by

                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                (formerly Bear Stearns Mortgage Securities Inc.)
                                                                                            CUSIP No. 073914 F40
First Distribution Date           :  August 3, 1998  Class                             :          A-3
Assumed Final Distribution Date   :  May 2, 2030     Original Certificate Principal
                                                     Balance of this Certificate
                                                     ("Denomination")                  :    $ 45,622,942.00
Certificate Rate                  :  Variable        Approximate Class Original
                                                     Certificate Principal Balance     :    $ 45,622,942.00

THIS CERTIFIES THAT                   Cede & Co.
is the  registered  owner of the  Percentage  Interest  evidenced  hereby in the
beneficial  ownership  interest  of  Certificates  of the  same  Class  as  this
Certificate in a trust (the  "Trust"),  the assets of which consist of a pool of
96 classes of mortgage backed securities (the "Pooled  Securities"),  the assets
of which consist primarily of (i) conventional,  fixed rate, first lien mortgage
loans secured by one- to four-family  residences or cooperative loans secured by
shares  in  cooperative   corporations   ("Mortgage  Loans")  or  (ii)  mortgage
certificates representing interests in 48 trusts or trust estates, the assets of
which  consist  primarily of Mortgage  Loans sold by Structured  Asset  Mortgage
Investments Inc.,  formerly known as Bear Stearns Mortgage  Securities Inc. (the
"Seller")  to the  Trust.  The  Pooled  Securities  were  sold to the  Seller by
SunAmerica  Inc.,  a  Maryland  corporation,   its  subsidiary  SunAmerica  Life
Insurance  Company,  an  Arizona  corporation,   and  certain  of  the  latter's
subsidiaries.  The Trust was created pursuant to the Pooling  Agreement dated as
of March 1, 1998 (the "Agreement"), by and between the Seller, as seller and The
Bank of New York,  as  trustee  (the  "Trustee")  a summary  of  certain  of the
pertinent  provisions  of which is set  forth  hereinafter.  To the  extent  not
defined herein, capitalized terms used herein shall have the meaning ascribed to
them in the  Agreement.  This  Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement, to which Agreement the Holder
of this Certificate by virtue of its acceptance hereof assents and by which such
Holder is bound. 

The Holder of this  Certificate  will be  entitled  to receive  interest  on its
Certificate  Principal  Balance on each monthly  Distribution Date at a variable
per annum  interest  rate equal to the lesser of (x) 6.75% and (y) the  weighted
average of the Pooled Security  Interest Rates, but in no event greater than (z)
a fraction,  expressed as a  percentage,  the numerator of which is the interest
distribution  on the  Pooled  Securities  for  which  both the  Pooled  Security
distribution and the related Pooled Security  Distribution Date Information have
been received by the Trustee by the times described in the Agreement, multiplied
by twelve, and the denominator of which is the aggregate  Certificate  Principal
Balance of the Certificates  (other than the Class A and Class PO Certificates).
The Assumed Final  Distribution Date is approximately one month after the Pooled
Security Distribution Date on which the final scheduled distribution on the last
to mature of the related  Pooled  Securities is scheduled to be made.  Since the
rate of payment of principal on the Underlying Mortgage Loans can be expected to
exceed  the rate of  payments  used in  calculating  each such  final  scheduled
distribution,  the date of the final  distribution on each class of Certificates
is expected to be earlier, and could be substantially  earlier, than the Assumed
Final Distribution  Date.  Distributions on this Certificate will be made by the
Trustee by check  mailed to the address of the Person  entitled  thereto as such
name and address shall appear on the Certificate  Register or, if such Person so
requests by notifying  the Trustee in writing as specified in the  Agreement and
if  such  Person  holds  Certificates  with  an  initial  aggregate  Certificate
Principal  Balance of not less than $1,000,000,  in immediately  available funds
(by wire  transfer or  otherwise)  to the account  specified  in writing by such
Person to the Trustee. Notwithstanding the above, the final distribution on this
Certificate will be made after due notice by the Trustee of the pendency of such
distribution and only upon presentation and surrender of this Certificate at the
office or agency  appointed  by the Trustee for that purpose and  designated  in
such notice.  Unless this  Certificate has been  countersigned  by an authorized
signatory  of the Trustee by manual  signature,  this  Certificate  shall not be
entitled to any benefit under the Agreement, or be valid for any purpose. *To be
reduced  generally  by the pro rata share of this Class  based on the Class A-1,
Class A-2, Class A-3, Class A-4, Class A-5 and Class R-3 Certificates  Principal
Balances of  distributions  of principal made on the Class A Certificates on the
Distribution Date and related Supplemental  Distribution Date, if any, deemed to
be in June 1998. IN WITNESS WHEREOF,  the Trustee has caused this Certificate to
be duly executed. Dated: ______________

                                                                 THE BANK OF NEW YORK,
Countersigned:                                                   Not in its individual capacity but solely as Trustee

By: _____________________________________________
Authorized signatory of The Bank of New York                     By: _____________________________
not in its individual capacity but solely as Trustee             AUTHORIZED OFFICER
</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>     <C>    
                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                    PASS-THROUGH CERTIFICATES, SERIES 1998-2



     This Certificate is one of a duly authorized                     The Certificates are issuable only as          
issue of Certificates designated as set forth on                 registered Certificates without coupons in the      
the face hereof (the "Certificates"), issued in                  Classes and denominations specified in the          
multiple Classes. The Certificates, in the                       Agreement. As provided in the Agreement and         
aggregate, evidence the entire beneficial                        subject to certain limitations thereinset forth,    
ownership interest in the Trust formed pursuant to               this Certificate is exchangeable for one or more    
the Agreement.                                                   new Certificates evidencing the same Class and in   
                                                                 the same aggregate Percentage Interest, as          
     The Certificateholder, by its acceptance of                 requested by the Holder surrendering the same.      
this Certificate, agrees that it will look solely                                                                    
to the Trust for payment hereunder and that the                       No service charge will be made to the             
Trustee is not liable to the Certificateholders                  Certificateholders for any such registration of        
for any amount payable under this Certificate or the             transfer, but the Trustee may require payment of a     
Agreement or, except as expressly provided in the                sum sufficient to cover any tax or other               
Agreement, subject to any liability under the Agreement.         governmental charge payable in connection              
                                                                 therewith. The Seller, the Trustee and any agent       
     This Certificate does not purport to                        of them may treat the Person in whosename the          
summarize the Agreement and reference is made to                 Certificate is registered as the owner hereof for      
the Agreement for the interests,  right and                      all purposes, and neither the Tristee nor any such     
limitationa of rights,  benefits,  obligations and               agent shall be affected by notice to the contrary.     
duties evidenced hereby,  and the rights,  duties                                                                       
and immunities of the trustee.                                        The obligations created by the Agreement and          
                                                                 the Trust created thereby (other than the                  
     The Agreement permits, with certain                         obligations to make payments and to send certain           
exceptions therein provided, the amendment thereof               notices to Certificateholders as set forth in the          
and the modification of the rights of the                        Agreement) shall terminate upon (i) the optional           
Certificateholders under the Agreement from time                 repurchase by the party named in the Agreement of          
to time by the Seller and the Trustee with the                   all the Pooled Securities in accordance with the           
consent of the Majority Certificateholders. Any                  terms of the Agreement, or (ii) the payment (or            
such consent by the Holder of this Certificate                   provision for payment) to the Certificateholders           
shall be conclusive and binding on such Holder and               of all amounts held by or on behalf of the Trustee         
upon all future Holders of this Certificate and of               and required to be paid to them under the                  
any Certificate issued upon the transfer hereof or               Agreement on the Final Distribution Date following         
in lieu hereof whether or not notation of such                   the final distribution to be made on the Pooled            
consent is made upon this Certificate. The                       Securities. Such optional repurchase may be made           
Agreement also permits the amendment thereof, in                 only on any Distribution Date upon the                     
certain limited circumstances, without the consent               determination, based upon an opinion of counsel,           
of the Holders of any of the Certificates.                       that the REMIC status of any of REMIC I, REMIC II          
                                                                 or REMIC III has been lost or that a substantial           
     As provided in the Agreement and subject to                 risk exists that such status will be lost for the          
certain limitations therein set forth, the                       then current year. In no event, however, will the          
transfer of this Certificate is registrable with                 Trust created by the Agreement continue beyond the         
the Trustee upon surrender of this Certificate for               expiration of 21 years after the death of certain          
registration of transfer at the offices or                       persons identified in the Agreement.                       
agencies maintained by the Trustee for such                      
purpose duly endorsed by, or accompanied by a
written instrument of transfer in form
satisfactory to the Trustee duly executed by the
Holder hereof or such Holder's attorney duly
authorized in writing, and thereupon one or more
new Certificates in authorized denominations
representing a like Class and aggregate Percentage
Interest will be issued to the designated
transferee.

</TABLE>


                                   ASSIGNMENT

      FOR  VALUE  RECEIVED,  the  undersigned  hereby  sell(s),   assign(s)  and
transfer(s) unto 
                ---------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
 (Please print or typewrite name and address including postal zip code assignee)

the within  Certificate  and hereby  authorizes the transfer of  registration of
such interest to the assignee on the Certificate Register of the Trust.

      I (We)  further  direct the Trustee to issue a new  Certificate  of a like
denomination and Class, to the above named assignee and deliver such Certificate
to the following address:

Dated:
                                         ---------------------------------------
                                         Signature by or on behalf of assignor


                                         ---------------------------------------
                                         Signature Guaranteed

                            DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately
available funds to______________________________________________________________
________________________________________________________________________________

for  the account of ____________________________________________________________

account number _____________, or, if mailed by check to_________________________

Applicable statements should be mailed to_______________________________________
This information is provided by_________________________________________________
the assignee named above, or____________________________________________________
as its agent.

692291v2                            
                                       R-2
<PAGE>


     THIS  CERTIFICATE  DOES NOT REPRESENT AN OBLIGATION  OF, OR AN INTEREST IN,
STRUCTURED  ASSET  MORTGAGE  INVESTMENTS  INC.,  FORMERLY  KNOWN AS BEAR STEARNS
MORTGAGE  SECURITIES  INC.,  OR THE  TRUSTEE  REFERRED  TO BELOW OR ANY OF THEIR
RESPECTIVE  AFFILIATES  AND IS NOT  GUARANTEED  OR INSURED  BY ANY  GOVERNMENTAL
AGENCY OR INSTRUMENTALITY.
     THIS  CERTIFICATE  IS A  "REGULAR  INTEREST"  IN A  "REAL  ESTATE  MORTGAGE
INVESTMENT CONDUIT" (A "REMIC"),  AS THOSE TERMS ARE DEFINED,  RESPECTIVELY,  IN
SECTIONS  860G AND 860D OF THE INTERNAL  REVENUE  CODE OF 1986,  AS AMENDED (THE
"CODE").
     THE CERTIFICATE  PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE DECREASED BY
THE PRINCIPAL  PAYMENTS HEREON.  ACCORDINGLY,  FOLLOWING THE INITIAL ISSUANCE OF
THE CERTIFICATES,  THE CERTIFICATE PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE
DIFFERENT FROM THE DENOMINATION  SHOWN BELOW.  ANYONE ACQUIRING THIS CERTIFICATE
MAY  ASCERTAIN  ITS  CURRENT  CERTIFICATE  PRINCIPAL  BALANCE  BY INQUIRY OF THE
TRUSTEE NAMED HEREIN.
     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY  TRUST  COMPANY  TO THE  TRUSTEE  OR ITS  AGENT FOR  REGISTRATION  OF
TRANSFER,  EXCHANGE OR PAYMENT,  AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME  OF  CEDE  &  CO.  OR  SUCH  OTHER  NAME  AS  REQUESTED  BY  AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO CEDE &
CO.,  ANY  TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
ANY PERSON IS WRONGFUL  SINCE THE  REGISTERED  OWNER HEREOF,  CEDE & CO., HAS AN
INTEREST HEREIN.
     THIS  CERTIFICATE  MAY  NOT  BE  ACQUIRED  DIRECTLY  OR  INDIRECTLY  BY,  A
TRANSFEREE  UNLESS THE PROPOSED  TRANSFEREE  CERTIFIES TO THE TRUSTEE THAT IT IS
NOT ACQUIRING SUCH CERTIFICATES DIRECTLY OR INDIRECTLY FOR, ON BEHALF OF OR WITH
THE ASSETS OF, AN EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT ARRANGEMENT WHICH IS
SUBJECT TO TITLE I OF THE EMPLOYEE  RETIREMENT  INCOME  SECURITY ACT OF 1974, AS
AMENDED,  AND/OR SECTION 4975 OF THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED,
OR IS AN  INSURANCE  COMPANY AND THE SOURCE OF FUNDS TO BE USED BY IT TO PAY THE
PURCHASE PRICE OF THE CERTIFICATES IS FUNDS HELD BY IT IN AN "INSURANCE  COMPANY
GENERAL  ACCOUNT" (AS DEFINED IN SECTION V(E) OF  PROHIBITED  TRANSACTION  CLASS
EXEMPTION  95-60 ("PTCE  95-60") AS PUBLISHED  IN 60 FED.  REG.  35925 (JULY 12,
1995)) AND IT REASONABLY BELIEVES, AS OF ACQUISITION, THE AMOUNT OF RESERVES AND
LIABILITIES FOR THE GENERAL  ACCOUNT  CONTRACTS HELD BY OR ON BEHALF OF ANY PLAN
(AND ANY OTHER  PLAN OF THE SAME  EMPLOYER  OR ITS  AFFILIATES  (AS  DEFINED  IN
SECTION V(A)(1) OF PTCE 95-60)) OR BY THE SAME EMPLOYEE  ORGANIZATION)  DOES NOT
EXCEED 10% OF THE TOTAL  RESERVE AND  LIABILITIES  OF SUCH GENERAL  ACCOUNT PLUS
SURPLUS (SUCH  DETERMINATION  TO BE MADE IN ACCORDANCE WITH SECTION I(A) OF PTCE
95-60), WHICH WILL BE DEEMED REPRESENTED BY AN OWNER OF A BOOK-ENTRY CERTIFICATE
OR GLOBAL  CERTIFICATE AND WILL BE EVIDENCED BY A REPRESENTATION  TO SUCH EFFECT
BY OR ON BEHALF OF A HOLDER OF A CERTIFICATE IN PHYSICAL FORM.
<TABLE>
<CAPTION>
<S>     <C>   

                            PASS-THROUGH CERTIFICATE,
                                  SERIES 1998-2
No. A-4-__
evidencing a beneficial interest in a Trust consisting primarily of the Pooled 
Securities (as defined below) sold by

                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                 (fomerly Bear Stearns Mortgage Securities Inc.)
                                                                                                          CUSIP No. 073914 F57
First Distribution Date         :    August 3, 1998    Class                                        :             A-4
Assumed Final Distribution Date :    May 2, 2030       Original Certificate Principal
                                                       Balance of this Certificate                       
                                                       ("Denomination")                             :     $ 25,000,000.00
Certificate Rate                :    Variable          Approximate Class Original
                                                       Certificate Principal Balance                :     $ 25,000,000.00

THIS CERTIFIES THAT                   Cede & Co.
is the  registered  owner of the  Percentage  Interest  evidenced  hereby in the
beneficial  ownership  interest  of  Certificates  of the  same  Class  as  this
Certificate in a trust (the  "Trust"),  the assets of which consist of a pool of
96 classes of mortgage backed securities (the "Pooled  Securities"),  the assets
of which consist primarily of (i) conventional,  fixed rate, first lien mortgage
loans secured by one- to four-family  residences or cooperative loans secured by
shares  in  cooperative   corporations   ("Mortgage  Loans")  or  (ii)  mortgage
certificates representing interests in 48 trusts or trust estates, the assets of
which  consist  primarily of Mortgage  Loans sold by Structured  Asset  Mortgage
Investments Inc.,  formerly known as Bear Stearns Mortgage  Securities Inc. (the
"Seller")  to the  Trust.  The  Pooled  Securities  were  sold to the  Seller by
SunAmerica  Inc.,  a  Maryland  corporation,   its  subsidiary  SunAmerica  Life
Insurance  Company,  an  Arizona  corporation,   and  certain  of  the  latter's
subsidiaries.  The Trust was created pursuant to the Pooling  Agreement dated as
of March 1, 1998 (the "Agreement"), by and between the Seller, as seller and The
Bank of New York,  as  trustee  (the  "Trustee")  a summary  of  certain  of the
pertinent  provisions  of which is set  forth  hereinafter.  To the  extent  not
defined herein, capitalized terms used herein shall have the meaning ascribed to
them in the  Agreement.  This  Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement, to which Agreement the Holder
of this Certificate by virtue of its acceptance hereof assents and by which such
Holder is bound.

The Holder of this  Certificate  will be  entitled  to receive  interest  on its
Certificate  Principal  Balance on each monthly  Distribution Date at a variable
per annum  interest  rate equal to the lesser of (x) 6.75% and (y) the  weighted
average of the Pooled Security  Interest Rates, but in no event greater than (z)
a fraction,  expressed as a  percentage,  the numerator of which is the interest
distribution  on the  Pooled  Securities  for  which  both the  Pooled  Security
distribution and the related Pooled Security  Distribution Date Information have
been received by the Trustee by the times described in the Agreement, multiplied
by twelve, and the denominator of which is the aggregate  Certificate  Principal
Balance of the Certificates  (other than the Class A and Class PO Certificates).
The Assumed Final  Distribution Date is approximately one month after the Pooled
Security Distribution Date on which the final scheduled distribution on the last
to mature of the related  Pooled  Securities is scheduled to be made.  Since the
rate of payment of principal on the Underlying Mortgage Loans can be expected to
exceed  the rate of  payments  used in  calculating  each such  final  scheduled
distribution,  the date of the final  distribution on each class of Certificates
is expected to be earlier, and could be substantially  earlier, than the Assumed
Final Distribution  Date.  Distributions on this Certificate will be made by the
Trustee by check  mailed to the address of the Person  entitled  thereto as such
name and address shall appear on the Certificate  Register or, if such Person so
requests by notifying  the Trustee in writing as specified in the  Agreement and
if  such  Person  holds  Certificates  with  an  initial  aggregate  Certificate
Principal  Balance of not less than $1,000,000,  in immediately  available funds
(by wire  transfer or  otherwise)  to the account  specified  in writing by such
Person to the Trustee. Notwithstanding the above, the final distribution on this
Certificate will be made after due notice by the Trustee of the pendency of such
distribution and only upon presentation and surrender of this Certificate at the
office or agency  appointed  by the Trustee for that purpose and  designated  in
such notice.  Unless this  Certificate has been  countersigned  by an authorized
signatory  of the Trustee by manual  signature,  this  Certificate  shall not be
entitled to any benefit under the Agreement, or be valid for any purpose. *To be
reduced  generally  by the pro rata share of this Class  based on the Class A-1,
Class A-2, Class A-3, Class A-4, Class A-5 and Class R-3  Certificate  Principal
Balances of  distributions  of principal made on the Class A Certificates on the
Distribution Date and related Supplemental  Distribution Date, if any, deemed to
be in June 1998. IN WITNESS WHEREOF,  the Trustee has caused this Certificate to
be duly executed.

Dated:  ______________                                                

                                                                      THE BANK OF NEW YORK,
Countersigned:                                                        Not in its individual capacity but solely as Trustee


By: _____________________________________________
Authorized signatory of The Bank of New York                          By: _____________________________
not in its individual capacity but solely as Trustee                  AUTHORIZED OFFICER
</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>     <C>
                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                    PASS-THROUGH CERTIFICATES, SERIES 1998-2



     This Certificate is one of a duly authorized                     The Certificates are issuable only as          
issue of Certificates designated as set forth on                 registered Certificates without coupons in the      
the face hereof (the "Certificates"), issued in                  Classes and denominations specified in the          
multiple Classes. The Certificates, in the                       Agreement. As provided in the Agreement and         
aggregate, evidence the entire beneficial                        subject to certain limitations thereinset forth,    
ownership interest in the Trust formed pursuant to               this Certificate is exchangeable for one or more    
the Agreement.                                                   new Certificates evidencing the same Class and in   
                                                                 the same aggregate Percentage Interest, as          
     The Certificateholder, by its acceptance of                 requested by the Holder surrendering the same.      
this Certificate, agrees that it will look solely                                                                    
to the Trust for payment hereunder and that the                       No service charge will be made to the             
Trustee is not liable to the Certificateholders                  Certificateholders for any such registration of        
for any amount payable under this Certificate or the             transfer, but the Trustee may require payment of a     
Agreement or, except as expressly provided in the                sum sufficient to cover any tax or other               
Agreement, subject to any liability under the Agreement.         governmental charge payable in connection              
                                                                 therewith. The Seller, the Trustee and any agent       
     This Certificate does not purport to                        of them may treat the Person in whosename the          
summarize the Agreement and reference is made to                 Certificate is registered as the owner hereof for      
the Agreement for the interests,  right and                      all purposes, and neither the Tristee nor any such     
limitationa of rights,  benefits,  obligations and               agent shall be affected by notice to the contrary.     
duties evidenced hereby,  and the rights,  duties                                                                       
and immunities of the trustee.                                        The obligations created by the Agreement and          
                                                                 the Trust created thereby (other than the                  
     The Agreement permits, with certain                         obligations to make payments and to send certain           
exceptions therein provided, the amendment thereof               notices to Certificateholders as set forth in the          
and the modification of the rights of the                        Agreement) shall terminate upon (i) the optional           
Certificateholders under the Agreement from time                 repurchase by the party named in the Agreement of          
to time by the Seller and the Trustee with the                   all the Pooled Securities in accordance with the           
consent of the Majority Certificateholders. Any                  terms of the Agreement, or (ii) the payment (or            
such consent by the Holder of this Certificate                   provision for payment) to the Certificateholders           
shall be conclusive and binding on such Holder and               of all amounts held by or on behalf of the Trustee         
upon all future Holders of this Certificate and of               and required to be paid to them under the                  
any Certificate issued upon the transfer hereof or               Agreement on the Final Distribution Date following         
in lieu hereof whether or not notation of such                   the final distribution to be made on the Pooled            
consent is made upon this Certificate. The                       Securities. Such optional repurchase may be made           
Agreement also permits the amendment thereof, in                 only on any Distribution Date upon the                     
certain limited circumstances, without the consent               determination, based upon an opinion of counsel,           
of the Holders of any of the Certificates.                       that the REMIC status of any of REMIC I, REMIC II          
                                                                 or REMIC III has been lost or that a substantial           
     As provided in the Agreement and subject to                 risk exists that such status will be lost for the          
certain limitations therein set forth, the                       then current year. In no event, however, will the          
transfer of this Certificate is registrable with                 Trust created by the Agreement continue beyond the         
the Trustee upon surrender of this Certificate for               expiration of 21 years after the death of certain          
registration of transfer at the offices or                       persons identified in the Agreement.                       
agencies maintained by the Trustee for such                      
purpose duly endorsed by, or accompanied by a
written instrument of transfer in form
satisfactory to the Trustee duly executed by the
Holder hereof or such Holder's attorney duly
authorized in writing, and thereupon one or more
new Certificates in authorized denominations
representing a like Class and aggregate Percentage
Interest will be issued to the designated
transferee.

</TABLE>


                                   ASSIGNMENT

      FOR  VALUE  RECEIVED,  the  undersigned  hereby  sell(s),   assign(s)  and
transfer(s) unto 
                ---------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
 (Please print or typewrite name and address including postal zip code assignee)

the within  Certificate  and hereby  authorizes the transfer of  registration of
such interest to the assignee on the Certificate Register of the Trust.

      I (We)  further  direct the Trustee to issue a new  Certificate  of a like
denomination and Class, to the above named assignee and deliver such Certificate
to the following address:

Dated:
                                         ---------------------------------------
                                         Signature by or on behalf of assignor


                                         ---------------------------------------
                                         Signature Guaranteed

                            DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately
available funds to______________________________________________________________
________________________________________________________________________________

for  the account of ____________________________________________________________

account number _____________, or, if mailed by check to_________________________

Applicable statements should be mailed to_______________________________________
This information is provided by_________________________________________________
the assignee named above, or____________________________________________________
as its agent.

692291v2
                                       S-2
<PAGE>

     THIS  CERTIFICATE  DOES NOT REPRESENT AN OBLIGATION  OF, OR AN INTEREST IN,
STRUCTURED  ASSET  MORTGAGE  INVESTMENTS  INC.,  FORMERLY  KNOWN AS BEAR STEARNS
MORTGAGE  SECURITIES  INC.,  OR THE  TRUSTEE  REFERRED  TO BELOW OR ANY OF THEIR
RESPECTIVE  AFFILIATES  AND IS NOT  GUARANTEED  OR INSURED  BY ANY  GOVERNMENTAL
AGENCY OR INSTRUMENTALITY.
     THIS  CERTIFICATE  IS A  "REGULAR  INTEREST"  IN A  "REAL  ESTATE  MORTGAGE
INVESTMENT CONDUIT" (A "REMIC"),  AS THOSE TERMS ARE DEFINED,  RESPECTIVELY,  IN
SECTIONS  860G AND 860D OF THE INTERNAL  REVENUE  CODE OF 1986,  AS AMENDED (THE
"CODE").
     THE CERTIFICATE  PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE DECREASED BY
THE PRINCIPAL  PAYMENTS HEREON.  ACCORDINGLY,  FOLLOWING THE INITIAL ISSUANCE OF
THE CERTIFICATES,  THE CERTIFICATE PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE
DIFFERENT FROM THE DENOMINATION  SHOWN BELOW.  ANYONE ACQUIRING THIS CERTIFICATE
MAY  ASCERTAIN  ITS  CURRENT  CERTIFICATE  PRINCIPAL  BALANCE  BY INQUIRY OF THE
TRUSTEE NAMED HEREIN.
     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY  TRUST  COMPANY  TO THE  TRUSTEE  OR ITS  AGENT FOR  REGISTRATION  OF
TRANSFER,  EXCHANGE OR PAYMENT,  AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME  OF  CEDE  &  CO.  OR  SUCH  OTHER  NAME  AS  REQUESTED  BY  AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO CEDE &
CO.,  ANY  TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
ANY PERSON IS WRONGFUL  SINCE THE  REGISTERED  OWNER HEREOF,  CEDE & CO., HAS AN
INTEREST HEREIN.
     THIS  CERTIFICATE  MAY  NOT  BE  ACQUIRED  DIRECTLY  OR  INDIRECTLY  BY,  A
TRANSFEREE  UNLESS THE PROPOSED  TRANSFEREE  CERTIFIES TO THE TRUSTEE THAT IT IS
NOT ACQUIRING SUCH CERTIFICATES DIRECTLY OR INDIRECTLY FOR, ON BEHALF OF OR WITH
THE ASSETS OF, AN EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT ARRANGEMENT WHICH IS
SUBJECT TO TITLE I OF THE EMPLOYEE  RETIREMENT  INCOME  SECURITY ACT OF 1974, AS
AMENDED,  AND/OR SECTION 4975 OF THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED,
OR IS AN  INSURANCE  COMPANY AND THE SOURCE OF FUNDS TO BE USED BY IT TO PAY THE
PURCHASE PRICE OF THE CERTIFICATES IS FUNDS HELD BY IT IN AN "INSURANCE  COMPANY
GENERAL  ACCOUNT" (AS DEFINED IN SECTION V(E) OF  PROHIBITED  TRANSACTION  CLASS
EXEMPTION  95-60 ("PTCE  95-60") AS PUBLISHED  IN 60 FED.  REG.  35925 (JULY 12,
1995)) AND IT REASONABLY BELIEVES, AS OF ACQUISITION, THE AMOUNT OF RESERVES AND
LIABILITIES FOR THE GENERAL  ACCOUNT  CONTRACTS HELD BY OR ON BEHALF OF ANY PLAN
(AND ANY OTHER  PLAN OF THE SAME  EMPLOYER  OR ITS  AFFILIATES  (AS  DEFINED  IN
SECTION V(A)(1) OF PTCE 95-60)) OR BY THE SAME EMPLOYEE  ORGANIZATION)  DOES NOT
EXCEED 10% OF THE TOTAL  RESERVE AND  LIABILITIES  OF SUCH GENERAL  ACCOUNT PLUS
SURPLUS (SUCH  DETERMINATION  TO BE MADE IN ACCORDANCE WITH SECTION I(A) OF PTCE
95-60), WHICH WILL BE DEEMED REPRESENTED BY AN OWNER OF A BOOK-ENTRY CERTIFICATE
OR GLOBAL  CERTIFICATE AND WILL BE EVIDENCED BY A REPRESENTATION  TO SUCH EFFECT
BY OR ON BEHALF OF A HOLDER OF A CERTIFICATE IN PHYSICAL FORM.
<TABLE>
<CAPTION>
<S>     <C>    

                            PASS-THROUGH CERTIFICATE,
                                  SERIES 1998-2
No. A-5-__
evidencing a beneficial interest in a Trust consisting primarily of the Pooled
Securities (as defined below) sold by

                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                (formerly Bear Stearns Mortgage Securities Inc.)
                                                                                                      CUSIP No. 073914 F65
First Distribution Date            :    August 3, 1998         Class                              :        A-5
Assumed Final Distribution Date    :    May 2, 2030            Original Certificate Principal
                                                               Balance of this Certificate
                                                               ("Denomination")                   :   $ 9,999,900.00
Certificate Rate                   :    Variable               Approximate Class Original
                                                               Certificate Principal Balance      :   $ 9,999,900.00

THIS CERTIFIES THAT                   Cede & Co.
is the  registered  owner of the  Percentage  Interest  evidenced  hereby in the
beneficial  ownership  interest  of  Certificates  of the  same  Class  as  this
Certificate in a trust (the  "Trust"),  the assets of which consist of a pool of
96 classes of mortgage backed securities (the "Pooled  Securities"),  the assets
of which consist primarily of (i) conventional,  fixed rate, first lien mortgage
loans secured by one- to four-family  residences or cooperative loans secured by
shares  in  cooperative   corporations   ("Mortgage  Loans")  or  (ii)  mortgage
certificates representing interests in 48 trusts or trust estates, the assets of
which  consist  primarily of Mortgage  Loans sold by Structured  Asset  Mortgage
Investments Inc.,  formerly known as Bear Stearns Mortgage  Securities Inc. (the
"Seller")  to the  Trust.  The  Pooled  Securities  were  sold to the  Seller by
SunAmerica  Inc.,  a  Maryland  corporation,   its  subsidiary  SunAmerica  Life
Insurance  Company,  an  Arizona  corporation,   and  certain  of  the  latter's
subsidiaries.  The Trust was created pursuant to the Pooling  Agreement dated as
of March 1, 1998 (the "Agreement"), by and between the Seller, as seller and The
Bank of New York,  as  trustee  (the  "Trustee")  a summary  of  certain  of the
pertinent  provisions  of which is set  forth  hereinafter.  To the  extent  not
defined herein, capitalized terms used herein shall have the meaning ascribed to
them in the  Agreement.  This  Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement, to which Agreement the Holder
of this Certificate by virtue of its acceptance hereof assents and by which such
Holder is bound. 

The Holder of this  Certificate  will be  entitled  to receive  interest  on its
Certificate  Principal  Balance on each monthly  Distribution Date at a variable
per annum  interest  rate equal to the lesser of (x) 6.75% and (y) the  weighted
average of the Pooled Security  Interest Rates, but in no event greater than (z)
a fraction,  expressed as a  percentage,  the numerator of which is the interest
distribution  on the  Pooled  Securities  for  which  both the  Pooled  Security
distribution and the related Pooled Security  Distribution Date Information have
been received by the Trustee by the times described in the Agreement, multiplied
by twelve, and the denominator of which is the aggregate  Certificate  Principal
Balance of the Certificates  (other than the Class A and Class PO Certificates).
The Assumed Final  Distribution Date is approximately one month after the Pooled
Security Distribution Date on which the final scheduled distribution on the last
to mature of the related  Pooled  Securities is scheduled to be made.  Since the
rate of payment of principal on the Underlying Mortgage Loans can be expected to
exceed  the rate of  payments  used in  calculating  each such  final  scheduled
distribution,  the date of the final  distribution on each class of Certificates
is expected to be earlier, and could be substantially  earlier, than the Assumed
Final Distribution  Date.  Distributions on this Certificate will be made by the
Trustee by check  mailed to the address of the Person  entitled  thereto as such
name and address shall appear on the Certificate  Register or, if such Person so
requests by notifying  the Trustee in writing as specified in the  Agreement and
if  such  Person  holds  Certificates  with  an  initial  aggregate  Certificate
Principal  Balance of not less than $1,000,000,  in immediately  available funds
(by wire  transfer or  otherwise)  to the account  specified  in writing by such
Person to the Trustee. Notwithstanding the above, the final distribution on this
Certificate will be made after due notice by the Trustee of the pendency of such
distribution and only upon presentation and surrender of this Certificate at the
office or agency  appointed  by the Trustee for that purpose and  designated  in
such notice.  Unless this  Certificate has been  countersigned  by an authorized
signatory  of the Trustee by manual  signature,  this  Certificate  shall not be
entitled to any benefit under the Agreement, or be valid for any purpose. *To be
reduced  generally  by the pro rata share of this Class  based on the Class A-1,
Class A-2, Class A-3, Class A-4, Class A-5 and Class R-3  Certificate  Principal
Balances of  distributions  of principal made on the Class A Certificates on the
Distribution Date and related Supplemental  Distribution Date, if any, deemed to
be in June 1998. IN WITNESS WHEREOF,  the Trustee has caused this Certificate to
be duly executed.

Dated:  ______________                                     
                                                                           THE BANK OF NEW YORK,
Countersigned:                                                    Not in its individual capacity but solely as Trustee

By: _____________________________________________
Authorized signatory of The Bank of New York                      By: _____________________________
not in its individual capacity but solely as Trustee              AUTHORIZED OFFICER
</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>     <C>    

                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                    PASS-THROUGH CERTIFICATES, SERIES 1998-2



     This Certificate is one of a duly authorized                     The Certificates are issuable only as          
issue of Certificates designated as set forth on                 registered Certificates without coupons in the      
the face hereof (the "Certificates"), issued in                  Classes and denominations specified in the          
multiple Classes. The Certificates, in the                       Agreement. As provided in the Agreement and         
aggregate, evidence the entire beneficial                        subject to certain limitations thereinset forth,    
ownership interest in the Trust formed pursuant to               this Certificate is exchangeable for one or more    
the Agreement.                                                   new Certificates evidencing the same Class and in   
                                                                 the same aggregate Percentage Interest, as          
     The Certificateholder, by its acceptance of                 requested by the Holder surrendering the same.      
this Certificate, agrees that it will look solely                                                                    
to the Trust for payment hereunder and that the                       No service charge will be made to the             
Trustee is not liable to the Certificateholders                  Certificateholders for any such registration of        
for any amount payable under this Certificate or the             transfer, but the Trustee may require payment of a     
Agreement or, except as expressly provided in the                sum sufficient to cover any tax or other               
Agreement, subject to any liability under the Agreement.         governmental charge payable in connection              
                                                                 therewith. The Seller, the Trustee and any agent       
     This Certificate does not purport to                        of them may treat the Person in whosename the          
summarize the Agreement and reference is made to                 Certificate is registered as the owner hereof for      
the Agreement for the interests,  right and                      all purposes, and neither the Tristee nor any such     
limitationa of rights,  benefits,  obligations and               agent shall be affected by notice to the contrary.     
duties evidenced hereby,  and the rights,  duties                                                                       
and immunities of the trustee.                                        The obligations created by the Agreement and          
                                                                 the Trust created thereby (other than the                  
     The Agreement permits, with certain                         obligations to make payments and to send certain           
exceptions therein provided, the amendment thereof               notices to Certificateholders as set forth in the          
and the modification of the rights of the                        Agreement) shall terminate upon (i) the optional           
Certificateholders under the Agreement from time                 repurchase by the party named in the Agreement of          
to time by the Seller and the Trustee with the                   all the Pooled Securities in accordance with the           
consent of the Majority Certificateholders. Any                  terms of the Agreement, or (ii) the payment (or            
such consent by the Holder of this Certificate                   provision for payment) to the Certificateholders           
shall be conclusive and binding on such Holder and               of all amounts held by or on behalf of the Trustee         
upon all future Holders of this Certificate and of               and required to be paid to them under the                  
any Certificate issued upon the transfer hereof or               Agreement on the Final Distribution Date following         
in lieu hereof whether or not notation of such                   the final distribution to be made on the Pooled            
consent is made upon this Certificate. The                       Securities. Such optional repurchase may be made           
Agreement also permits the amendment thereof, in                 only on any Distribution Date upon the                     
certain limited circumstances, without the consent               determination, based upon an opinion of counsel,           
of the Holders of any of the Certificates.                       that the REMIC status of any of REMIC I, REMIC II          
                                                                 or REMIC III has been lost or that a substantial           
     As provided in the Agreement and subject to                 risk exists that such status will be lost for the          
certain limitations therein set forth, the                       then current year. In no event, however, will the          
transfer of this Certificate is registrable with                 Trust created by the Agreement continue beyond the         
the Trustee upon surrender of this Certificate for               expiration of 21 years after the death of certain          
registration of transfer at the offices or                       persons identified in the Agreement.                       
agencies maintained by the Trustee for such                      
purpose duly endorsed by, or accompanied by a
written instrument of transfer in form
satisfactory to the Trustee duly executed by the
Holder hereof or such Holder's attorney duly
authorized in writing, and thereupon one or more
new Certificates in authorized denominations
representing a like Class and aggregate Percentage
Interest will be issued to the designated
transferee.

</TABLE>


                                   ASSIGNMENT

      FOR  VALUE  RECEIVED,  the  undersigned  hereby  sell(s),   assign(s)  and
transfer(s) unto 
                ---------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
 (Please print or typewrite name and address including postal zip code assignee)

the within  Certificate  and hereby  authorizes the transfer of  registration of
such interest to the assignee on the Certificate Register of the Trust.

      I (We)  further  direct the Trustee to issue a new  Certificate  of a like
denomination and Class, to the above named assignee and deliver such Certificate
to the following address:

Dated:
                                         ---------------------------------------
                                         Signature by or on behalf of assignor


                                         ---------------------------------------
                                         Signature Guaranteed

                            DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately
available funds to______________________________________________________________
________________________________________________________________________________

for  the account of ____________________________________________________________

account number _____________, or, if mailed by check to_________________________

Applicable statements should be mailed to_______________________________________
This information is provided by_________________________________________________
the assignee named above, or____________________________________________________
as its agent.


692291v2
                                       T-2

               
<PAGE>

                                                                      EXHIBIT L2
THIS  CERTIFICATE  DOES NOT  REPRESENT  AN  OBLIGATION  OF, OR AN  INTEREST  IN,
STRUCTURED  ASSET  MORTGAGE  INVESTMENTS  INC.,  FORMERLY  KNOWN AS BEAR STEARNS
MORTGAGE  SECURITIES  INC.,  OR THE  TRUSTEE  REFERRED  TO BELOW OR ANY OF THEIR
RESPECTIVE  AFFILIATES  AND IS NOT  GUARANTEED  OR INSURED  BY ANY  GOVERNMENTAL
AGENCY OR INSTRUMENTALITY.
     FOR U.S.  FEDERAL  INCOME TAX  PURPOSES,  THIS  CERTIFICATE  IS A "RESIDUAL
INTEREST" IN A "REAL ESTATE  MORTGAGE  INVESTMENT  CONDUIT" (A "REMIC") AS THOSE
TERMS ARE  DEFINED,  RESPECTIVELY,  IN  SECTIONS  860G AND 860D OF THE  INTERNAL
REVENUE  CODE  OF  1986,  AS  AMENDED  (THE  "CODE"),  AND  IS  NOT  TREATED  AS
INDEBTEDNESS  OF THE TRUST  REFERRED TO BELOW.  EACH  PURCHASER  OF THE INTEREST
REPRESENTED  BY THIS  CERTIFICATE  WILL BE REQUIRED TO REPRESENT IN AN AFFIDAVIT
THAT  IT IS  NOT A  "DISQUALIFIED  ORGANIZATION"  AND  WILL  NOT  TRANSFER  THIS
CERTIFICATE   TO  A   "DISQUALIFIED   ORGANIZATION."   THE  TERM   "DISQUALIFIED
ORGANIZATION" IS DEFINED IN SECTION 860E(e)(5) OF THE CODE AND IN THE AGREEMENT.
EACH  PURCHASER WILL ALSO BE REQUIRED TO REPRESENT IN SUCH AFFIDAVIT THAT (A) IT
IS NOT ACQUIRING CERTIFICATES FOR THE ACCOUNT OF A DISQUALIFIED ORGANIZATION AND
(B) IT WILL NOT TRANSFER THIS  CERTIFICATE  UNLESS (1) IT HAS RECEIVED A SIMILAR
AFFIDAVIT  FROM THE PROPOSED  TRANSFEREE AND (2) AS OF THE TIME OF THE TRANSFER,
IT DOES NOT HAVE ACTUAL KNOWLEDGE THAT THE AFFIDAVIT OF THE PROPOSED  TRANSFEREE
IS FALSE. IN THE EVENT THAT LEGISLATION IS ENACTED WHICH WOULD SUBJECT THE TRUST
REFERRED  TO BELOW TO TAX (OR  DISQUALIFY  THE TRUST  REFERRED  TO BELOW) ON THE
TRANSFER OF AN INTEREST  REPRESENTED BY THIS  CERTIFICATE TO ANY OTHER PERSON OR
PERSONS,  STRUCTURED  ASSET MORTGAGE  INVESTMENTS  INC.  SHALL,  WITHOUT FURTHER
ACTION ON THE PART OF THE HOLDER OF THE RESIDUAL  CERTIFICATE  BE EMPOWERED,  TO
THE FULLEST  EXTENT  POSSIBLE AND AS IF IT HAD SO VOTED,  TO AMEND THE AGREEMENT
REFERRED  TO BELOW TO RESTRICT OR PROHIBIT  PROSPECTIVELY  SUCH  TRANSFER.  THIS
CERTIFICATE MAY NOT BE TRANSFERRED TO A NON-U.S.  PERSON AS DESCRIBED IN SECTION
4.05(c) OF THE AGREEMENT  REFERRED TO BELOW WITHOUT THE PRIOR WRITTEN CONSENT OF
THE BANK OF NEW YORK, ACTING FOR THE TAX MATTERS PERSON.
     THE CERTIFICATE  PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE DECREASED BY
THE PRINCIPAL  PAYMENTS HEREON.  ACCORDINGLY,  FOLLOWING THE INITIAL ISSUANCE OF
THE CERTIFICATES,  THE CERTIFICATE PRINCIPAL BALANCE OF THIS CERTIFICATE WILL BE
DIFFERENT FROM THE DENOMINATION  SHOWN BELOW.  ANYONE ACQUIRING THIS CERTIFICATE
MAY  ASCERTAIN  ITS  CURRENT  CERTIFICATE  PRINCIPAL  BALANCE  BY INQUIRY OF THE
TRUSTEE NAMED HEREIN.
     THIS  CERTIFICATE  MAY  NOT  BE  ACQUIRED  DIRECTLY  OR  INDIRECTLY  BY,  A
TRANSFEREE  UNLESS THE PROPOSED  TRANSFEREE  CERTIFIES TO THE TRUSTEE THAT IT IS
NOT ACQUIRING SUCH CERTIFICATES DIRECTLY OR INDIRECTLY FOR, ON BEHALF OF OR WITH
THE ASSETS OF, AN EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT ARRANGEMENT WHICH IS
SUBJECT TO TITLE I OF THE EMPLOYEE  RETIREMENT  INCOME  SECURITY ACT OF 1974, AS
AMENDED,  AND/OR SECTION 4975 OF THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED,
OR IS AN  INSURANCE  COMPANY AND THE SOURCE OF FUNDS TO BE USED BY IT TO PAY THE
PURCHASE PRICE OF THE CERTIFICATES IS FUNDS HELD BY IT IN AN "INSURANCE  COMPANY
GENERAL  ACCOUNT" (AS DEFINED IN SECTION V(E) OF  PROHIBITED  TRANSACTION  CLASS
EXEMPTION  95-60 ("PTCE  95-60") AS PUBLISHED  IN 60 FED.  REG.  35925 (JULY 12,
1995)) AND IT REASONABLY BELIEVES, AS OF ACQUISITION, THE AMOUNT OF RESERVES AND
LIABILITIES FOR THE GENERAL  ACCOUNT  CONTRACTS HELD BY OR ON BEHALF OF ANY PLAN
(AND ANY OTHER  PLAN OF THE SAME  EMPLOYER  OR ITS  AFFILIATES  (AS  DEFINED  IN
SECTION V(A)(1) OF PTCE 95-60)) OR BY THE SAME EMPLOYEE  ORGANIZATION)  DOES NOT
EXCEED 10% OF THE TOTAL  RESERVE AND  LIABILITIES  OF SUCH GENERAL  ACCOUNT PLUS
SURPLUS (SUCH  DETERMINATION  TO BE MADE IN ACCORDANCE WITH SECTION I(A) OF PTCE
95-60), WHICH WILL BE DEEMED REPRESENTED BY AN OWNER OF A BOOK-ENTRY CERTIFICATE
OR GLOBAL  CERTIFICATE AND WILL BE EVIDENCED BY A REPRESENTATION  TO SUCH EFFECT
BY OR ON BEHALF OF A HOLDER OF A CERTIFICATE IN PHYSICAL FORM.
<TABLE>
<CAPTION>
<S>     <C>   

                            PASS-THROUGH CERTIFICATE,
                                  SERIES 1998-2
No. R-3-
evidencing a beneficial interest in a Trust consisting primarily of the Pooled
Securities (as defined below) sold by

                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.                                                           
                 (fomerly Bear Stearns Mortgage Securities Inc.)
                                                                                                           CUSIP No. 073914 F73
First Distribution Date            :    August 3, 1998        Class                                   :    R-3
Assumed Final Distribution Date    :    May 2, 2030           Original Certificate Principal Balance
                                                              of this Certificate
                                                              ("Denomination")                        :    $100.76*
Certificate Rate                   :    Variable              Approximate Original Class
                                                              Certificate Principal Balance           :    $100.76*

THIS CERTIFIES THAT
is the  registered  owner of the  Percentage  Interest  evidenced  hereby in the
beneficial  ownership  interest  of  Certificates  of the  same  Class  as  this
Certificate in a trust (the  "Trust"),  the assets of which consist of a pool of
96 classes of mortgage backed securities (the "Pooled  Securities"),  the assets
of which consist primarily of (i) conventional,  fixed rate, first lien mortgage
loans secured by one- to four-family  residences or cooperative loans secured by
shares  in  cooperative   corporations   ("Mortgage  Loans")  or  (ii)  mortgage
certificates representing interests in 48 trusts or trust estates, the assets of
which  consist  primarily of Mortgage  Loans sold by Structured  Asset  Mortgage
Investments Inc.,  formerly known as Bear Stearns Mortgage  Securities Inc. (the
"Seller")  to the  Trust.  The  Pooled  Securities  were  sold to the  Seller by
SunAmerica  Inc.,  a  Maryland  corporation,   its  subsidiary  SunAmerica  Life
Insurance  Company,  an  Arizona  corporation,   and  certain  of  the  latter's
subsidiaries.  The Trust was created pursuant to the Pooling  Agreement dated as
of March 1, 1998 (the "Agreement"), by and between the Seller, as seller and The
Bank of New York,  as  trustee  (the  "Trustee")  a summary  of  certain  of the
pertinent  provisions  of which is set  forth  hereinafter.  To the  extent  not
defined herein, capitalized terms used herein shall have the meaning ascribed to
them in the  Agreement.  This  Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement, to which Agreement the Holder
of this Certificate by virtue of its acceptance hereof assents and by which such
Holder is bound.

The Holder of this  Certificate  will be  entitled  to receive  interest  on its
Certificate  Principal  Balance on each monthly  Distribution Date at a variable
per annum  interest  rate equal to the lesser of (x) 6.75% and (y) the  weighted
average of the Pooled Security  Interest Rates, but in no event greater than (z)
a fraction,  expressed as a  percentage,  the numerator of which is the interest
distribution  on the  Pooled  Securities  for  which  both the  Pooled  Security
distribution and the related Pooled Security  Distribution Date Information have
been received by the Trustee by the times described in the Agreement, multiplied
by twelve, and the denominator of which is the aggregate  Certificate  Principal
Balance of the Certificates  (other than the Class A and Class PO Certificates).
The Assumed Final  Distribution Date is approximately one month after the Pooled
Security Distribution Date on which the final scheduled distribution on the last
to mature of the related  Pooled  Securities is scheduled to be made.  Since the
rate of payment of principal on the Underlying Mortgage Loans can be expected to
exceed  the rate of  payments  used in  calculating  each such  final  scheduled
distribution,  the date of the final  distribution on each class of Certificates
is expected to be earlier, and could be substantially  earlier, than the Assumed
Final  Distribution  Date.  The holder of this  Certificate  is also entitled to
receive  any  remaining  assets of REMIC III  after  all  other  Classes  of New
Certificates  have been paid in full.  Distributions on this Certificate will be
made by the  Trustee  by check  mailed to the  address  of the  Person  entitled
thereto as such name and address shall appear on the Certificate Register or, if
such Person so requests by notifying  the Trustee in writing as specified in the
Agreement  and if such  Person  holds  Certificates  with an  initial  aggregate
Certificate  Principal  Balance  of not less  than  $1,000,000,  in  immediately
available  funds (by wire  transfer or  otherwise)  to the account  specified in
writing by such  Person to the  Trustee.  Notwithstanding  the above,  the final
distribution on this Certificate will be made after due notice by the Trustee of
the pendency of such  distribution  and only upon  presentation and surrender of
this  Certificate  at the office or agency  appointed  by the  Trustee  for that
purpose  and  designated  in such  notice.  Unless  this  Certificate  has  been
countersigned  by an  authorized  signatory of the Trustee by manual  signature,
this Certificate shall not be entitled to any benefit under the Agreement, or be
valid for any purpose.  *To be reduced  generally by the pro rates share of this
Class based on the Class A-1,  Class A-2,  Class A-3,  Class A-4,  Class A-5 and
Class R-3 Certificate  Principal  Balances of distributions of principal made on
the Class A  Certificates  on the  Distribution  Date and  related  Supplemental
Distribution  Date, if any, deemed to be in June 1998. IN WITNESS  WHEREOF,  the
Trustee has caused this Certificate to be duly executed.

Dated:  _________________                                       
                                                                      THE BANK OF NEW YORK,
Countersigned:                                                        Not in its individual capacity but solely as Trustee


By_____________________________________________
Authorized signatory of The Bank of New York                          By: _____________________________
not in its individual capacity but solely as Trustee                  AUTHORIZED OFFICER

</TABLE>

<PAGE>
<TABLE>
<CAPTION>
<S>     <C>    

                   STRUCTURED ASSET MORTGAGE INVESTMENTS INC.
                    PASS-THROUGH CERTIFICATES, SERIES 1998-2



     This Certificate is one of a duly authorized                     The Certificates are issuable only as          
issue of Certificates designated as set forth on                 registered Certificates without coupons in the      
the face hereof (the "Certificates"), issued in                  Classes and denominations specified in the          
multiple Classes. The Certificates, in the                       Agreement. As provided in the Agreement and         
aggregate, evidence the entire beneficial                        subject to certain limitations thereinset forth,    
ownership interest in the Trust formed pursuant to               this Certificate is exchangeable for one or more    
the Agreement.                                                   new Certificates evidencing the same Class and in   
                                                                 the same aggregate Percentage Interest, as          
     The Certificateholder, by its acceptance of                 requested by the Holder surrendering the same.      
this Certificate, agrees that it will look solely                                                                    
to the Trust for payment hereunder and that the                       No service charge will be made to the             
Trustee is not liable to the Certificateholders                  Certificateholders for any such registration of        
for any amount payable under this Certificate or the             transfer, but the Trustee may require payment of a     
Agreement or, except as expressly provided in the                sum sufficient to cover any tax or other               
Agreement, subject to any liability under the Agreement.         governmental charge payable in connection              
                                                                 therewith. The Seller, the Trustee and any agent       
     This Certificate does not purport to                        of them may treat the Person in whosename the          
summarize the Agreement and reference is made to                 Certificate is registered as the owner hereof for      
the Agreement for the interests,  right and                      all purposes, and neither the Tristee nor any such     
limitationa of rights,  benefits,  obligations and               agent shall be affected by notice to the contrary.     
duties evidenced hereby,  and the rights,  duties                                                                       
and immunities of the trustee.                                        The obligations created by the Agreement and          
                                                                 the Trust created thereby (other than the                  
     The Agreement permits, with certain                         obligations to make payments and to send certain           
exceptions therein provided, the amendment thereof               notices to Certificateholders as set forth in the          
and the modification of the rights of the                        Agreement) shall terminate upon (i) the optional           
Certificateholders under the Agreement from time                 repurchase by the party named in the Agreement of          
to time by the Seller and the Trustee with the                   all the Pooled Securities in accordance with the           
consent of the Majority Certificateholders. Any                  terms of the Agreement, or (ii) the payment (or            
such consent by the Holder of this Certificate                   provision for payment) to the Certificateholders           
shall be conclusive and binding on such Holder and               of all amounts held by or on behalf of the Trustee         
upon all future Holders of this Certificate and of               and required to be paid to them under the                  
any Certificate issued upon the transfer hereof or               Agreement on the Final Distribution Date following         
in lieu hereof whether or not notation of such                   the final distribution to be made on the Pooled            
consent is made upon this Certificate. The                       Securities. Such optional repurchase may be made           
Agreement also permits the amendment thereof, in                 only on any Distribution Date upon the                     
certain limited circumstances, without the consent               determination, based upon an opinion of counsel,           
of the Holders of any of the Certificates.                       that the REMIC status of any of REMIC I, REMIC II          
                                                                 or REMIC III has been lost or that a substantial           
     As provided in the Agreement and subject to                 risk exists that such status will be lost for the          
certain limitations therein set forth, the                       then current year. In no event, however, will the          
transfer of this Certificate is registrable with                 Trust created by the Agreement continue beyond the         
the Trustee upon surrender of this Certificate for               expiration of 21 years after the death of certain          
registration of transfer at the offices or                       persons identified in the Agreement.                       
agencies maintained by the Trustee for such                      
purpose duly endorsed by, or accompanied by a
written instrument of transfer in form
satisfactory to the Trustee duly executed by the
Holder hereof or such Holder's attorney duly
authorized in writing, and thereupon one or more
new Certificates in authorized denominations
representing a like Class and aggregate Percentage
Interest will be issued to the designated
transferee.
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                                   ASSIGNMENT

      FOR  VALUE  RECEIVED,  the  undersigned  hereby  sell(s),   assign(s)  and
transfer(s) unto 
                ---------------------------------------------------------------

- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
 (Please print or typewrite name and address including postal zip code assignee)

the within  Certificate  and hereby  authorizes the transfer of  registration of
such interest to the assignee on the Certificate Register of the Trust.

      I (We)  further  direct the Trustee to issue a new  Certificate  of a like
denomination and Class, to the above named assignee and deliver such Certificate
to the following address:

Dated:
                                         ---------------------------------------
                                         Signature by or on behalf of assignor


                                         ---------------------------------------
                                         Signature Guaranteed

                            DISTRIBUTION INSTRUCTIONS

The assignee should include the following for purposes of distribution:

Distributions shall be made, by wire transfer or otherwise, in immediately
available funds to______________________________________________________________
________________________________________________________________________________

for  the account of ____________________________________________________________

account number _____________, or, if mailed by check to_________________________





Applicable statements should be mailed to_______________________________________
This information is provided by_________________________________________________
the assignee named above, or____________________________________________________
as its agent.



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