AIM FUNDS GROUP/DE
N-30D, 1999-03-08
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<PAGE>   1
                                  [COVER IMAGE]

                                       AIM
                          INTERMEDIATE GOVERNMENT FUND

[AIMM LOGO APPEARS HERE]          ANNUAL REPORT                 DECEMBER 31 1998


                  INVEST WITH DISCIPLINE--Regstered Trademark--

<PAGE>   2
                                 [ COVER IMAGE ]

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

                              Fourth of July, 1916
                by Frederick Childe Hassam (1839-1935, American)
               Hassam was an American Impressionist painter famous
             for his luminous paintings of flags and New York street
         scenes. This vibrant painting depicts a parade route on Fifth
           Avenue in 1916, prior to the U.S. entry into World War I.
             Hassam captures the patriotic fervor of the day and the
                   burgeoning strength of the American spirit.

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



AIM Intermediate Government Fund is for shareholders who seek a high level of
current income and relative price stability. The Fund invests in a portfolio of
U.S. government securities.

ABOUT FUND PERFORMANCE AND PORTFOLIO DATA THROUGHOUT THIS REPORT:

o   AIM Intermediate Government Fund performance figures are historical and
    reflect reinvestment of all distributions and changes in net asset value.
    Unless otherwise indicated, the Fund's performance is computed at net asset
    value without a sales charge.
o   During the fiscal year ended 12/31/98 the Fund paid distributions of $0.63
    per Class A share, $0.55 per Class B share, and $0.55 per Class C share.
o   When sales charges are included in performance figures, Class A share
    performance reflects the maximum 4.75% sales charge, and Class B and Class C
    share performance reflects the applicable contingent deferred sales charge
    (CDSC) for the period involved. The CDSC on Class B shares declines from 5%
    beginning at the time of purchase to 0% at the beginning of the seventh
    year. The CDSC on Class C shares is 1% for the first year after purchase.
    The performance of the Fund's Class B and Class C shares will differ from
    that of Class A shares due to differences in sales charge structure and
    class expenses.
o   The Fund's investment return and principal value will fluctuate so that an
    investor's shares, when redeemed, may be worth more or less than their
    original cost.
o   The Fund's portfolio composition is subject to change, and there is no
    assurance the Fund will continue to hold any particular security.
o   The 30-day yield is calculated on the basis of a formula defined by the
    Securities and Exchange Commission (SEC). The formula is based on the
    portfolio's potential earnings from dividends, interest, yield-to-maturity
    or yield-to-call of its holdings, net of all expenses and expressed on an
    annualized basis.
o   The Fund's annualized distribution rate reflects the Fund's most recent
    monthly dividend distribution multiplied by 12 and divided by the most
    recent month-end maximum offering price. The Fund's distribution rate and
    30-day SEC yield will differ.
o   Government securities, such as U.S. Treasury bills, notes, and bonds, offer
    a high degree of safety and are guaranteed as to the timely payment of
    principal and interest if held to maturity. Fund shares are not insured and
    their value and yield will vary with market conditions.

ABOUT INDEXES AND OTHER PERFORMANCE BENCHMARKS CITED IN THIS REPORT:

o   The Lehman Brothers Intermediate Government Bond Index is an unmanaged
    composite generally considered representative of intermediate U.S. Treasury
    and U.S. Government agency securities.
o   An investment cannot be made in any index listed. Unless otherwise
    indicated, index results include reinvested dividends and do not reflect
    sales charges.

          AN INVESTMENT IN THE FUND IS NOT A DEPOSIT OF A BANK AND IS
           NOT INSURED OR GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE
          CORPORATION OR ANY OTHER GOVERNMENT AGENCY. THERE IS A RISK
              THAT YOU COULD LOSE A PORTION OR ALL OF YOUR MONEY.

   This report may be distributed only to current shareholders or to persons
               who have received a current prospectus of the Fund.

                        AIM INTERMEDIATE GOVERNMENT FUND
<PAGE>   3
                       ANNUAL REPORT / CHAIRMAN'S LETTER

                    Dear Fellow Shareholder:

                    As the fiscal year opened, markets were recovering from the
     [PHOTO OF      concerns produced by financial crises in Asia during 1997,
    Charles T.      and this optimism early in 1998 led several equity market
      Bauer,        indexes to all-time highs in spring and early summer.
   Chairman of      However, the year was to bring two particularly serious
   the Board of     financial shocks, first the debt default by Russia, and
     THE FUND       later the gathering crisis in Brazil, which devalued its
   APPEARS HERE]    currency shortly after the fiscal year closed. The result
                    was another year of significant volatility in both equity
                    and fixed-income markets. 

                    MARKET RECAP 
                    Buoyant equity markets and healthy economic growth in Europe
                    and the U.S. kept bond prices relatively stable early in
                    1998. But optimism turned to profound pessimism over the
                    summer as global financial crises caused a worldwide loss of
confidence. Investors flocked to securities perceived as safe and liquid, 
especially U.S. Treasuries. Even high-quality corporate bonds went out of favor,
and high-yield corporate bonds plummeted. Beginning in late September, the U.S.
Federal Reserve Board intervened to pump liquidity and confidence into markets.
Numerous interest rate cuts in other countries followed. Investors responded
favorably, and by year end, bond market volatility had generally subsided.

HOW SHOULD INVESTORS RESPOND?
We understood how unnerving 1998's level of volatility could have been. Our
repeated message to you is to keep a long-term outlook on investments rather
than responding to short-term fluctuations. And we are pleased to note that most
mutual fund shareholders remained cool headed and did not pull out of the
markets during 1998. In the end, most were rewarded for their long-term
perspective. 
    In view of recent volatility and the divergent performance of market
sectors, this may be a very good time to meet with your financial consultant to
review your current asset allocation and the diversification of your portfolio.
Broad portfolio diversification remains one of the most fundamental principles
of investing, along with long-term thinking and realistic expectations.

YOUR FUND MANAGERS' COMMENTS
On the pages that follow, your Fund's managers, experienced professionals who
have weathered previous periods of market turbulence, offer more detailed
discussion of how markets behaved, how they managed the portfolio in light of
recent volatility, and what they foresee for markets and your Fund. We hope you
find their discussion informative. 

    YEAR 2000 CONCERN Many of our shareholders have asked us about AIM's year
2000 readiness status. We appreciate these concerns, and we take the year 2000
issue seriously. AIM has devoted considerable effort to creating a comprehensive
plan for assessing, correcting and testing our in-house systems. We will also
participate in an industrywide testing effort scheduled to begin in March. But
no matter how well we prepare and test, no one can know for sure what the year
2000 will bring. Our industry's systems are connected in complex ways to many
third parties, and there may be unforeseen problems when the year 2000 actually
arrives. Though we cannot predict what all those problems might be, we are
working with our business recovery team to develop contingency plans appropriate
for a variety of year 2000 scenarios. We are pleased to send you this report on
your Fund's fiscal year. If you have any questions or comments, please contact
our Client Services department at 800-959-4246, or e-mail your inquiry to us at
[email protected]. You can access information about your account through our
AIM Investor Line at 800-246-5463 or on our Web site, www.aimfunds.com. We often
post market updates on our Web site. 

    We thank you for your continued participation in The AIM Family of
Funds--Registered Trademark--.


Sincerely, 

/s/ CHARLES T. BAUER 

Charles T. Bauer
Chairman, A I M Advisors, Inc.

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

                              . . . WE ARE PLEASED

                                TO NOTE THAT MOST

                                   MUTUAL FUND

                              SHAREHOLDERS REMAINED

                                 COOL HEADED AND

                             DID NOT PULL OUT OF THE

                              MARKETS DURING 1998.

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

                        AIM INTERMEDIATE GOVERNMENT FUND
<PAGE>   4

                       ANNUAL REPORT / MANAGERS' OVERVIEW

FUND PROVIDES STABILITY IN TURBULENT MARKET ENVIRONMENT

IT WAS A VOLATILE TIME FOR EQUITY AND FIXED-INCOME MARKETS ALIKE. HOW DID THE
FUND PERFORM DURING THE TWELVE MONTHS ENDED DECEMBER 31, 1998?
Despite an environment rife with turmoil and volatility, AIM Intermediate
Government Fund stayed in line with its investment objective of providing a
steady flow of income while preserving capital. For the fiscal year ended
December 31, 1998, the Fund's total return was 8.17% for Class A Shares, 7.40%
for Class B shares, and 7.31% for Class C shares.
    In addition, the Fund continued to provide a high level of current income
during the year covered by this report. As of December 31, 1998 the Fund's
30-day distribution rate was 6.26% for Class A shares, 5.76% for Class B shares,
and 5.77% for Class C Shares. The Fund's 30-day SEC yield at maximum offering
price was 4.81%, 4.30%, and 4.30% for Class A, B, and C shares respectively.

WHAT WERE THE MAJOR FACTORS INFLUENCING THE INVESTING ENVIRONMENT DURING 1998?
In general, the reporting period was a tumultuous one as the Asian economic
crisis that began in the latter half of 1997 spent 1998 intermittently wreaking
havoc in both equity and fixed-income markets. Certainly this was most evident
in August and September when a combination of factors stemming from Asia
resulted in a fear-driven global flight from all forms of investment risk.
    In a matter of weeks, aspirations for total returns were replaced with those
for preservation of capital. Investors abandoned riskier securities causing
equity and nongovernment bond markets around the world to tumble. The chief
beneficiaries of this volatile investment environment were government bonds in
the United States and the industrialized nations in Europe. As these securities
are backed by the full faith and credit of their governments, they were viewed
as a safe haven throughout this time of unrest. 
    Markets eventually rebounded after a series of interest rate cuts by the
Federal Reserve Board (the Fed). However the effects of the market sell-off left
many investors wary. As investors had watched the value of riskier securities
plummet, many saw fit to diversify their assets by adding a relatively more
stable asset to their portfolio, such as AIM Intermediate Government Fund, to
dampen market volatility. This is evident as the Fund's net assets grew from
$259 million to $522 million in 1998. 

HOW DOES THE FUND'S STRATEGY COMPENSATE FOR TIMES OF MARKET UNCERTAINTY? 
Diversification is a key element in weathering market volatility. As a result,
we spread the Fund's assets among U.S. government bonds that have a variety of
maturities and coupon rates. However, it is not unusual to re-allocate some of
our assets into securities that may respond favorably to the existing market
conditions.
    As a general rule, the shorter the time period before a security matures,
the less volatile its price and yield. Thus, in times of uncertainty in the bond
market, the Fund may allocate more assets toward shorter-term securities, like
five-year notes, to help temper the volatility of the Fund's portfolio and
protect capital.
    At the same time, mortgage-backed securities and bonds with longer
maturities, like 10-year U.S. Treasury notes, are more susceptible to price
fluctuations in a volatile market. While this creates a relatively greater risk,
it also offers greater opportunity for income and growth of capital. In times of
market stability, the Fund may allocate a greater amount of its assets to these
types of securities to take advantage of yield and total return opportunities.
    Overall, our primary goal is to provide a product for the investor that will
maintain a low level of volatility while producing competitive returns. Through
diversification, the Fund strives to combine the average price volatility of a
five-year Treasury note with the yield of a 30-year Treasury bond. True to its
objective, in 1998 the Fund maintained 64% of the price volatility of a
five-year note, while producing a yield of 119% the rate of a 30-year bond.


GROWTH OF NET ASSETS

12/31/97 to 12/31/98

[BAR CHART]

101% Growth
================================================================================
 $259           $522 
Million        Million
- --------------------------------------------------------------------------------
12/31/97       12/31/98
================================================================================

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

                    OVERALL, OUR PRIMARY GOAL IS TO PROVIDE

                        A PRODUCT FOR THE INVESTOR THAT

                    WILL MAINTAIN A LOW LEVEL OF VOLATILITY

                      WHILE PRODUCING COMPETITIVE RETURNS.

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

          See important Fund and index disclosures inside front cover.

                        AIM INTERMEDIATE GOVERNMENT FUND
<PAGE>   5
                       ANNUAL REPORT / MANAGERS' OVERVIEW

HOW WAS THIS INVESTMENT STRATEGY UTILIZED DURING THE VOLATILITY IN AUGUST AND
SEPTEMBER?
After a strong first quarter in the equity markets, a volatile May and June gave
us a snapshot of what we believed could be expected from Asia in the second half
of 1998. As market volatility typically results in a demand for relatively safer
securities like U.S. Treasuries, we reduced our exposure to mortgage-backed
securities while reallocating a portion of our assets in Treasuries. This proved
beneficial for the Fund as the third quarter witnessed a surging demand for
Treasuries.

HOW DID FALLING INTEREST RATES AFFECT THE FUND'S HOLDINGS IN MORTGAGE-BACKED 
SECURITIES?
Historically, the Fund maintains a substantial weighting in mortgage-backed
securities as they can provide a yield that is generally higher than
intermediate-term Treasury securities with comparable credit risk. Despite the
fact that the Fed cut rates three times during the fall--causing longer-term
interest rates to fall in tandem--the Fund did not suffer any serious setbacks
as a result. This can be largely attributed to the research-intensive approach
we take in selecting these securities. Using thorough research, the Fund targets
securitized mortgages that are less likely to be refinanced. While mortgage
refinancings did increase on the whole during the fall, we found that our
careful selection process sufficiently reduced the impact of refinancings on the
Fund.

HOW WAS THE FUND POSITIONED AT THE END OF THE REPORTING PERIOD?
The third-quarter flight from risk caused prices of mortgage-backed securities
to decline. As prices declined, yields on these securities rose considerably in
relation to Treasury yields. With low prices and attractive yields, the
mortgage-backed markets were awash with bargains. As it became clear that
investor confidence was returning and that the Treasury rally was in its final
stages, management was able to reduce its weighting in the lower-yielding
Treasury securities and add value to the portfolio with underpriced,
higher-yielding mortgage-backed securities. 
    At the close of the reporting period, the Fund had allocated 61.36% of its
investments to mortgage-backed securities, with the remaining assets allocated
among U.S. Treasury securities, U.S. Agency obligations, and cash, or cash
equivalents.

WHAT IS YOUR OUTLOOK FOR THE NEAR TERM?
While it appeared at the mid-point of 1998 that the robust economic growth might
result in an increase in the Federal Funds rate, it soon became apparent that
Asia's economic struggles and the effects on the global marketplace would not
allow for such action. Instead, the Fed cut short-term rates by 0.75% in the
final months of 1998 to enhance worldwide liquidity. In addition, the Fed has
made it clear that it would not hesitate to lower rates again if need dictates.
Uncertainty still remains regarding Japan and the emerging markets of Asia and
Latin America, specifically in China and Brazil. As in 1998, the devaluation of
a currency or a similar economic crisis could result in investors rushing back
into the U.S. Treasury market and additional interest rate cuts.
    On the domestic front, most analysts expect a slowdown in U.S. economic
growth and a continuation of relatively low inflation. Historically, these
conditions have proven beneficial for bond investors. Regardless of what the
coming year may bring, AIM Intermediate Government Fund will strive to tailor
the portfolio to market conditions as they change. In doing so, the Fund will
endeavor to provide the same stability and level of income it has in the past.

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

                     . . . the Fund will endeavor to provide

                        the same stability and level of

                           income it has in the past.

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


BREAKDOWN OF 
MORTGAGE-BACKED SECURITIES

As of 12/31/98

                                   [Pie Chart]

==================================================================
Federal Home Loan Mortgage Corp.                  19.80%

Government National Mortgage Assn.                33.92%

Federal National Mortgage Assn.                   46.28%

Please keep in mind that the Fund's portfolio is subject to change 
and there is no assurance the Fund will continue to hold any 
particular security.
===================================================================

          See important Fund and index disclosures inside front cover.

                        AIM INTERMEDIATE GOVERNMENT FUND
<PAGE>   6
                      ANNUAL REPORT / PERFORMANCE HISTORY

YOUR FUND'S LONG-TERM PERFORMANCE

RESULTS OF A $10,000 INVESTMENT
AIM INTERMEDIATE GOVERNMENT FUND VS. BENCHMARK INDEX

4/28/87-12/31/98

[Line Chart]

- --------------------------------------------------------------------------------
            AIM       Lehman Brothers
       Intermediate    Intermediate 
      Government Fund   Government
       Class A Shares   Bond Index
- --------------------------------------------------------------------------------
            In thousands

4/28/97  $9,524.00      $10,000.00
12/87     9,922.00       10,683.00
12/88    10,560.00       11,202.00
12/89    11,752.00       12,421.00
12/90    12,855.00       13,831.00
12/91    14,524.00       15,470.00
12/92    15,432.00       17,014.00
12/93    16,524.00       18,247.00
12/94    15,955.00       18,040.00
12/95    18,552.00       20,484.00
12/96    18,989.00       21,218.00
12/97    20,711.00       22,770.00
12/98    23,525.00       24,704.00

================================================================================

PAST PERFORMANCE IS NO GUARANTEE OF COMPARABLE FUTURE RESULTS.

================================================================================

AVERAGE ANNUAL TOTAL RETURNS 

As of 12/31/98, including sales charges

CLASS A SHARES

Inception (4/28/87)     7.15%
 10 years               7.29%
  5 years               5.25%
  1 year                3.05%*

CLASS B SHARES

Inception (9/7/93)      4.96%
  5 years               5.14%
  1 year                2.40%**

CLASS C SHARES

Inception (8/4/97)      7.84%
  1 year                6.31%***

* 8.17% excluding sales charge
** 7.40% excluding CDSC
*** 7.31% excluding CDSC
================================================================================

Source: Bloomberg, Towers Data Systems HYPO--Registered Trademark--. Your Fund's
total return includes applicable sales charges, expenses, and management fees.
The performance of Class B and Class C shares will differ from that of Class A
shares due to differing fees and expenses. For Fund performance calculations and
descriptions of indexes cited on this page, please refer to the inside front
cover.

MARKET VOLATILITY CAN SIGNIFICANTLY IMPACT SHORT-TERM PERFORMANCE. RESULTS OF AN
INVESTMENT MADE TODAY MAY DIFFER SUBSTANTIALLY FROM THE HISTORICAL PERFORMANCE
SHOWN.

ABOUT THIS CHART
The chart above compares your Fund's Class A shares to a benchmark index. It is
intended to give you a general idea of how your Fund compared to the government
bond market over the period 4/28/87-12/31/98. (Data for the index are for the
period 4/30/87-12/31/98.) It is important to understand differences between your
Fund and this index. Your Fund's total return is shown with a sales charge and
includes Fund expenses and management fees. An index measures performance of a
hypothetical portfolio, in this case the Lehman Brothers Intermediate Government
Bond Index. Unlike your Fund, an index is not managed, incurring no sales
charges, expenses, or fees. But if you could buy all the securities that make up
a market index, you would incur expenses that would affect the return on your
investment.


                        AIM INTERMEDIATE GOVERNMENT FUND


<PAGE>   7
 
SCHEDULE OF INVESTMENTS
 
December 31, 1998
 
<TABLE>
<CAPTION>
                                    PRINCIPAL       MARKET
                                     AMOUNT          VALUE
<S>                                <C>           <C>
U.S. GOVERNMENT AGENCY
  SECURITIES-89.92%

FEDERAL FARM CREDIT BANK-1.02%

Debentures
  6.15%, 09/01/00                  $   700,000   $     714,007
- --------------------------------------------------------------
  6.22%, 06/17/08                    4,500,000       4,592,070
- --------------------------------------------------------------
                                                     5,306,077
- --------------------------------------------------------------

FEDERAL HOME LOAN BANK-1.40%

Debentures
  7.31%, 07/06/01                    4,000,000       4,226,240
- --------------------------------------------------------------
  7.36%, 07/01/04                    2,800,000       3,083,276
- --------------------------------------------------------------
                                                     7,309,516
- --------------------------------------------------------------

FEDERAL HOME LOAN MORTGAGE CORP.
  ("FHLMC")-16.08%

Pass through certificates
  12.00%, 04/01/00 to 02/01/13          21,385          24,304
- --------------------------------------------------------------
  6.50%, 07/01/01 to 11/01/28       28,103,205      28,385,142
- --------------------------------------------------------------
  6.50%, 01/01/29 TBA(a)             5,000,000       5,037,500
- --------------------------------------------------------------
  9.00%, 12/01/05 to 04/01/25        5,234,953       5,532,144
- --------------------------------------------------------------
  8.00%, 07/01/06 to 10/01/10          407,206         419,717
- --------------------------------------------------------------
  8.50%, 07/01/07 to 12/01/26        6,786,107       7,127,059
- --------------------------------------------------------------
  7.00%, 11/01/10 to 04/01/11        1,389,914       1,426,275
- --------------------------------------------------------------
  10.00%, 11/01/11 to 04/01/20      11,301,740      12,534,120
- --------------------------------------------------------------
  6.00%, 12/01/13                    9,950,000       9,984,228
- --------------------------------------------------------------
  10.50%, 08/01/19 to 01/01/21       1,994,761       2,200,924
- --------------------------------------------------------------
  9.50%, 11/01/20 to 04/01/25       10,342,546      11,186,033
- --------------------------------------------------------------
                                                    83,857,446
- --------------------------------------------------------------

FEDERAL NATIONAL MORTGAGE
  ASSOCIATION ("FNMA")-43.88%

Debentures
  8.25%, 12/18/00                    5,000,000       5,310,600
- --------------------------------------------------------------
  7.50%, 02/01/02                    9,000,000       9,638,370
- --------------------------------------------------------------
  8.50%, 02/01/05                    4,500,000       4,651,603
- --------------------------------------------------------------
  5.875, 02/02/06                    8,000,000       8,286,640
- --------------------------------------------------------------
Medium term notes
  6.40%, 09/27/05                    4,610,000       4,910,987
- --------------------------------------------------------------
</TABLE>
 
<TABLE>
<CAPTION>
                                    PRINCIPAL       MARKET
                                     AMOUNT          VALUE
<S>                                <C>           <C>
FEDERAL NATIONAL MORTGAGE ASSOCIATION
  ("FNMA")-(CONTINUED)

Pass through certificates
  8.50%, 01/01/07 to 03/01/07      $    24,386   $      25,400
- --------------------------------------------------------------
  6.00%, 01/01/09 to 04/01/24       23,018,376      23,096,981
- --------------------------------------------------------------
  7.50%, 06/01/10 to 03/01/27       20,529,246      21,176,306
- --------------------------------------------------------------
  7.00%, 05/01/11 to 10/01/12        8,741,914       8,957,681
- --------------------------------------------------------------
  5.50%, 01/20/14                   40,000,000      39,542,614
- --------------------------------------------------------------
  9.50%, 07/01/16 to 08/01/22        2,065,040       2,219,696
- --------------------------------------------------------------
  10.00%, 12/01/19 to 12/01/21      10,184,521      11,260,162
- --------------------------------------------------------------
  8.00%, 04/01/25 to 07/01/26        7,497,739       7,795,250
- --------------------------------------------------------------
  6.50%, 05/01/13 to 11/01/28       28,272,652      28,544,543
- --------------------------------------------------------------
  6.50%, 01/01/29 TBA(a)             5,000,000       5,034,375
- --------------------------------------------------------------
  6.50%, 01/14/29                   48,000,000      48,394,054
- --------------------------------------------------------------
                                                   228,845,262
- --------------------------------------------------------------

GOVERNMENT NATIONAL MORTGAGE
  ASSOCIATION ("GNMA")-27.54%

Pass through certificates
  6.00%, 10/15/08 to 1/21/29        78,536,178      77,967,762
- --------------------------------------------------------------
  6.50%, 10/15/08                      510,612         522,897
- --------------------------------------------------------------
  9.00%, 10/15/08 to 04/15/21        1,482,663       1,600,516
- --------------------------------------------------------------
  9.50%, 06/15/09 to 03/15/23        5,554,078       6,008,989
- --------------------------------------------------------------
  10.00%, 11/15/09 to 10/15/19      12,115,087      13,278,238
- --------------------------------------------------------------
  11.00%, 12/15/09 to 09/15/15         117,928         131,104
- --------------------------------------------------------------
  12.50%, 11/15/10                     151,379         175,599
- --------------------------------------------------------------
  13.00%, 01/15/11 to 05/15/15         347,109         403,871
- --------------------------------------------------------------
  12.00%, 01/15/13 to 07/15/15         512,453         583,753
- --------------------------------------------------------------
  10.50%, 07/15/13 to 02/15/16         215,242         237,035
- --------------------------------------------------------------
  13.50%, 07/15/10 to 04/15/15         288,034         339,171
- --------------------------------------------------------------
  8.00%, 01/15/22 to 06/15/27       15,176,291      15,859,602
- --------------------------------------------------------------
  7.50%, 03/15/26 to 08/15/28        8,038,391       8,299,071
- --------------------------------------------------------------
  7.00%, 10/15/08 to 07/15/28       17,808,840      18,255,191
- --------------------------------------------------------------
                                                   143,662,799
- --------------------------------------------------------------
    Total U.S. Government Agency
      Securities (Cost
      $464,842,643)                                468,981,100
- --------------------------------------------------------------
</TABLE>
 
                                        5
<PAGE>   8
 
<TABLE>
<CAPTION>
                                    PRINCIPAL       MARKET
                                     AMOUNT          VALUE
<S>                                <C>           <C>
U.S. TREASURY SECURITIES-28.04%

U.S. TREASURY NOTES &
  BONDS-26.47%

  11.75%, 02/15/01                 $26,375,000   $  30,154,274
- --------------------------------------------------------------
  6.125%, 12/31/01                   5,000,000       5,208,400
- --------------------------------------------------------------
  6.00%, 07/31/02                    5,000,000       5,217,100
- --------------------------------------------------------------
  5.25%, 08/15/03 to 11/15/28       21,000,000      21,532,270
- --------------------------------------------------------------
  4.25%, 11/15/03                    5,000,000       4,937,200
- --------------------------------------------------------------
  5.625%, 05/15/08                  10,000,000      10,662,400
- --------------------------------------------------------------
  4.75%, 11/15/08                    5,000,000       5,035,950
- --------------------------------------------------------------
  7.50%, 11/15/16                    5,500,000       6,833,750
- --------------------------------------------------------------
  7.25%, 08/15/22                    1,100,000       1,369,797
- --------------------------------------------------------------
  5.50%, 08/15/28                   45,000,000      47,113,650
- --------------------------------------------------------------
                                                   138,064,791
- --------------------------------------------------------------
</TABLE>
 
<TABLE>
<CAPTION>
                                    PRINCIPAL       MARKET
                                     AMOUNT          VALUE
<S>                                <C>           <C>
U.S. TREASURY STRIPS-1.57%(b)

  5.38% to 6.85%, 05/15/06 to
    11/15/18 (8,000,000)(c)        $15,750,000   $   8,197,513
- --------------------------------------------------------------
    Total U.S. Treasury
      Securities (Cost
      $143,967,245)                                146,262,304
- --------------------------------------------------------------
    Total Investments (excluding
      Repurchase Agreements)                       615,243,404
- --------------------------------------------------------------

REPURCHASE AGREEMENT-14.38%(d)

Greenwich Capital Markets, Inc.,
  5.10% 01/04/99(e)                  4,556,250       4,556,250
- --------------------------------------------------------------
SBC Warburg Dillon Read, Inc.,
  4.75% 01/04/99(f)                 70,460,703      70,460,703
- --------------------------------------------------------------
    Total Repurchase Agreements
      (Cost $75,016,953)                            75,016,953
- --------------------------------------------------------------
TOTAL INVESTMENTS-132.34%                          690,260,357
- --------------------------------------------------------------
LIABILITIES LESS OTHER
  ASSETS-(32.34%)                                 (168,702,843)
- --------------------------------------------------------------
NET ASSETS-100.00%                               $ 521,557,514
==============================================================
</TABLE>
 
Notes to Schedule of Investments:
 
(a) At 12/31/98, cost of securities purchased on a when-issued basis totaled
    $175,422,691. These securities are also subject to dollar roll transactions.
    See Note 1.B. of Notes to Financial Statements.
(b) STRIPS are traded on a discount basis. In such cases the interest rate shown
    represents the rate of discount paid or received at the time of purchase by
    the Fund.
(c) Amount in parenthesis represents principal amount deposited in escrow with
    custodian as collateral for reverse repurchase agreements outstanding at
    12/31/98.
(d) Collateral on repurchase agreements, including the Fund's pro-rata interest
    in joint repurchase agreements, is taken into possession by the Fund upon
    entering into the repurchase agreement. The collateral is marked to market
    daily to ensure its market value is at least 102% of the sales price of the
    repurchase agreement. The investments in some repurchase agreements are
    through participation in joint accounts with other mutual funds, private
    accounts and certain non-registered investment companies managed by the
    investment advisor or its affiliates.
(e) Joint repurchase agreement entered into 12/31/98 with a maturing value of
    $300,170,000. Collateralized by $383,443,653 U.S. Government obligations,
    5.50% to 10.00%, due 10/01/01 to 01/01/29 with an aggregate market value at
    12/31/98 of $306,003,501.
(f) Joint repurchase agreement entered into 12/31/98 with a maturing value of
    $1,000,527,778. Collateralized by $2,207,068,000 U.S. Government
    obligations, 0% to 6.75%, due 06/30/99 to 11/15/21 with an aggregate market
    value at 12/31/98 of $1,020,001,079.
 
Abbreviation:
 
TBA    - To Be Announced
STRIPS - Separately Traded Registered Interest and Principal Security
 
See Notes to Financial Statements.
                                        6
<PAGE>   9
 
STATEMENT OF ASSETS AND LIABILITIES
 
DECEMBER 31, 1998
 
<TABLE>
<S>                                          <C>
ASSETS:

Investments, at market value (cost
  $608,809,888)                              $615,243,404
- ---------------------------------------------------------
Repurchase agreements (cost $75,016,953)       75,016,953
- ---------------------------------------------------------
Cash                                                3,598
- ---------------------------------------------------------
Receivables for:
  Fund shares sold                              8,516,934
- ---------------------------------------------------------
  Interest                                      5,821,191
- ---------------------------------------------------------
  Principal paydowns                            1,059,791
- ---------------------------------------------------------
Investment for deferred compensation plan          34,753
- ---------------------------------------------------------
Other assets                                       58,901
- ---------------------------------------------------------
    Total assets                              705,755,525
- ---------------------------------------------------------

LIABILITIES:

Payables for:
  Investments purchased (on when issued or
    delayed delivery basis)                   175,422,691
- ---------------------------------------------------------
  Fund shares reacquired                        2,183,727
- ---------------------------------------------------------
  Dividends                                       952,047
- ---------------------------------------------------------
  Reverse repurchase agreements (Note 5)        4,556,250
- ---------------------------------------------------------
  Interest expense (Note 5)                           410
- ---------------------------------------------------------
  Deferred compensation plan                       34,753
- ---------------------------------------------------------
Accrued advisory fees                             190,150
- ---------------------------------------------------------
Accrued administrative services fees                6,276
- ---------------------------------------------------------
Accrued distribution fees                         485,806
- ---------------------------------------------------------
Accrued transfer agent fees                        54,720
- ---------------------------------------------------------
Accrued operating expenses                        311,181
- ---------------------------------------------------------
    Total liabilities                         184,198,011
- ---------------------------------------------------------
Net assets applicable to shares outstanding  $521,557,514
- ---------------------------------------------------------

NET ASSETS:

Class A                                      $245,612,558
=========================================================
Class B                                      $237,918,779
=========================================================
Class C                                      $ 38,026,177
=========================================================

SHARES OUTSTANDING, $0.01 PAR VALUE PER
  SHARE:

Class A                                        25,647,222
=========================================================
Class B                                        24,816,721
=========================================================
Class C                                         3,977,986
=========================================================
Class A:
  Net asset value and redemption price per
    share                                    $       9.58
- ---------------------------------------------------------
  Offering price per share:
    (Net asset value of $9.58
      divided by 95.25%)                     $      10.06
=========================================================
Class B:
  Net asset value and offering price per
    share                                    $       9.59
=========================================================
Class C:
  Net asset value and offering price per
    share                                    $       9.56
=========================================================
</TABLE>
 
See Notes to Financial Statements.
 
STATEMENT OF OPERATIONS
 
FOR THE YEAR ENDED DECEMBER 31, 1998
 
<TABLE>
<S>                                           <C>
INVESTMENT INCOME:

Interest                                      $26,948,269
- ---------------------------------------------------------
EXPENSES:
Advisory fees                                   1,611,515
- ---------------------------------------------------------
Administrative services fees                       80,271
- ---------------------------------------------------------
Custodian fees                                     64,754
- ---------------------------------------------------------
Distribution fees - Class A                       478,781
- ---------------------------------------------------------
Distribution fees - Class B                     1,359,570
- ---------------------------------------------------------
Distribution fees - Class C                       248,197
- ---------------------------------------------------------
Interest (Note 5)                                 851,004
- ---------------------------------------------------------
Transfer agent fees - Class A                     311,166
- ---------------------------------------------------------
Transfer agent fees - Class B                     170,992
- ---------------------------------------------------------
Transfer agent fees - Class C                      30,268
- ---------------------------------------------------------
Trustees' fees                                     10,622
- ---------------------------------------------------------
Other                                             254,001
- ---------------------------------------------------------
    Total expenses                              5,471,141
- ---------------------------------------------------------
Less: Expenses paid indirectly                     (3,953)
- ---------------------------------------------------------
    Net expenses                                5,467,188
- ---------------------------------------------------------
Net investment income                          21,481,081
- ---------------------------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS) FROM
  INVESTMENT SECURITIES:

Net realized gain from investment securities    6,570,449
- ---------------------------------------------------------
Net unrealized appreciation (depreciation)
  of investment securities                     (2,570,929)
- ---------------------------------------------------------
  Net gain on investment securities             3,999,520
- ---------------------------------------------------------
Net increase in net assets resulting from
  operations                                  $25,480,601
=========================================================
</TABLE>
 
                                        7
<PAGE>   10
 
STATEMENT OF CHANGES IN NET ASSETS
 
FOR THE YEARS ENDED DECEMBER 31, 1998 AND 1997
 
<TABLE>
<CAPTION>
                                                                  1998              1997
                                                              ------------      ------------
<S>                                                           <C>               <C>
OPERATIONS:

  Net investment income                                       $ 21,481,081      $ 15,863,224
- --------------------------------------------------------------------------------------------
  Net realized gain (loss) from investment securities            6,570,449           (73,291)
- --------------------------------------------------------------------------------------------
  Net unrealized appreciation (depreciation) of investment
    securities                                                  (2,570,929)        4,443,700
- --------------------------------------------------------------------------------------------
    Net increase in net assets resulting from operations        25,480,601        20,233,633
- --------------------------------------------------------------------------------------------
Distributions to shareholders from net investment income:
  Class A                                                      (12,395,672)      (10,575,295)
- --------------------------------------------------------------------------------------------
  Class B                                                       (7,690,274)       (4,595,241)
- --------------------------------------------------------------------------------------------
  Class C                                                       (1,395,135)          (19,501)
- --------------------------------------------------------------------------------------------
Distributions in excess of net investment income:
  Class A                                                         (247,750)               --
- --------------------------------------------------------------------------------------------
  Class B                                                         (176,643)               --
- --------------------------------------------------------------------------------------------
  Class C                                                          (32,108)               --
- --------------------------------------------------------------------------------------------
Return of capital:
  Class A                                                               --          (430,314)
- --------------------------------------------------------------------------------------------
  Class B                                                               --          (214,788)
- --------------------------------------------------------------------------------------------
  Class C                                                               --              (713)
- --------------------------------------------------------------------------------------------
Share transactions-net:
  Class A                                                       76,269,628        (9,731,599)
- --------------------------------------------------------------------------------------------
  Class B                                                      147,670,216         8,255,456
- --------------------------------------------------------------------------------------------
  Class C                                                       35,531,445         1,834,127
- --------------------------------------------------------------------------------------------
    Net increase in net assets                                 263,014,308         4,755,765
- --------------------------------------------------------------------------------------------

NET ASSETS:

  Beginning of period                                          258,543,206       253,787,441
- --------------------------------------------------------------------------------------------
  End of period                                               $521,557,514      $258,543,206
============================================================================================

NET ASSETS CONSIST OF:

  Shares of beneficial interest                               $524,340,223      $264,984,880
- --------------------------------------------------------------------------------------------
  Undistributed net investment income                              (42,488)          (32,484)
- --------------------------------------------------------------------------------------------
  Undistributed net realized gain (loss) from investment
    securities                                                  (9,173,737)      (15,413,635)
- --------------------------------------------------------------------------------------------
  Unrealized appreciation of investment securities               6,433,516         9,004,445
- --------------------------------------------------------------------------------------------
                                                              $521,557,514      $258,543,206
============================================================================================
</TABLE>
 
NOTES TO FINANCIAL STATEMENTS
 
DECEMBER 31, 1998
 
NOTE 1-SIGNIFICANT ACCOUNTING POLICIES
 
AIM Intermediate Government Fund (the "Fund") is a series portfolio of AIM Funds
Group (the "Trust"). The Trust is a Delaware business trust registered under the
Investment Company Act of 1940, as amended (the "1940 Act"), as an open-end
series management investment company consisting of nine separate series
portfolios, each having an unlimited number of shares of beneficial interest.
The Fund currently offers three different classes of shares: Class A shares,
Class B shares, and Class C shares. Class A shares are sold with a front-end
sales charge. Class B and Class C shares are sold with a contingent deferred
sales charge. Matters affecting each portfolio or class will be voted on
exclusively by the shareholders of such portfolio or class. The assets,
liabilities and operations of each portfolio are accounted for separately. The
Fund's investment objective is to seek to achieve a high level of current income
consistent with reasonable concern for safety of principal by investing in debt
securities issued, guaranteed or otherwise backed by the United States
Government. Information presented in these financial statements pertains only to
the Fund.
 
  The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities at the date of the
financial statements and the reported amounts of revenues and expenses during
the reporting period. Actual results could differ from those estimates. The
following is a summary of significant accounting policies followed by the Fund
in the preparation of its financial statements.
 
                                        8
<PAGE>   11
 
A.  Security Valuations -- Debt obligations that are issued or guaranteed by the
    U.S. Government, its agencies, authorities, and instrumentalities are valued
    on the basis of prices provided by an independent pricing service. Prices
    provided by the pricing service may be determined without exclusive reliance
    on quoted prices, and may reflect appropriate factors such as yield, type of
    issue, coupon rate, maturity date and seasoning differential. Securities for
    which market prices are not provided by the pricing service are valued at
    the mean between the last bid and asked prices based upon quotes furnished
    by independent sources. Securities for which market quotations are either
    not readily available or are questionable are valued at fair value as
    determined in good faith by or under the supervision of the Trust's officers
    in a manner specifically authorized by the Board of Trustees. Short-term
    obligations having 60 days or less to maturity are valued at amortized cost
    which approximates market value.
 
B.  Securities Transactions, Investment Income and Distributions -- Securities
    transactions are accounted for on a trade date basis. The Fund may engage in
    dollar roll transactions with respect to mortgage backed securities issued
    by GNMA, FNMA and FHLMC. In a dollar roll transaction, the Fund sells a
    mortgage backed security held in the Fund to a financial institution such as
    a bank or broker-dealer, and simultaneously agrees to repurchase a
    substantially similar security (same type, coupon and maturity) from the
    institution at a later date at an agreed upon price. The mortgage backed
    securities that are repurchased will bear the same interest rate as those
    sold, but generally will be collateralized by different pools of mortgages
    with different prepayment histories. During the period between the sale and
    repurchase, the Fund will not be entitled to receive interest and principal
    payments on the securities sold. Proceeds of the sale will be invested in
    short-term instruments, and the income from these investments, together with
    any additional fee income received on the sale, could generate income for
    the Fund exceeding the yield on the security sold.
 
     Dollar roll transactions involve the risk that the market value of the
   securities retained by the Fund may decline below the price of the securities
   that the Fund has sold but is obligated to repurchase under the agreement. In
   the event the buyer of securities in a dollar roll transaction files for
   bankruptcy or becomes insolvent, the Fund's use of the proceeds from the sale
   of the securities may be restricted pending a determination by the other
   party, or its trustee or receiver, whether to enforce the Fund's obligation
   to repurchase the securities.
 
     Realized gains or losses on sales are computed on the basis of specific
   identification of the securities sold. Interest income is recorded as earned
   from settlement date and is recorded on the accrual basis. It is the policy
   of the Fund to declare daily dividends from net investment income. Such
   dividends are paid monthly. Distributions from net realized capital gains, if
   any, are recorded on ex-dividend date and are paid annually subject to
   restrictions described in Note 1 Section "C". On December 31, 1998, $720,772
   was reclassified from undistributed net realized gain (loss) to undistributed
   net investment income as a result of permanent book/tax differences due to
   the differing book/tax treatment for principal paydown losses on
   mortgage-backed securities. Also, undistributed net investment income was
   increased by $1,167,269, undistributed net realized gain (loss) was decreased
   by $1,051,323 and paid-in-capital was decreased by $115,946 in order to
   comply with the requirements of the American Institute of Certified Public
   Accountants Statement of Position 93-2. Net assets of the Fund were
   unaffected by the reclassifications discussed above.
 
C.  Federal Income Taxes -- The Fund intends to comply with the requirements of
    the Internal Revenue Code necessary to qualify as a regulated investment
    company and, as such, will not be subject to federal income taxes on
    otherwise taxable income (including net realized capital gains) which is
    distributed to shareholders. Therefore, no provision for federal income
    taxes is recorded in the financial statements. The Fund has a capital loss
    carryforward of $8,696,199 (which may be carried forward to offset future
    taxable capital gains, if any) which expires, if not previously utilized,
    through the year 2004. The Fund cannot distribute capital gains to
    shareholders until the tax loss carryforwards have been utilized.
 
D. Expenses -- Distribution and transfer agency expenses directly attributable
   to a class of shares are charged to that class' operations. All other
   expenses which are attributable to more than one class are allocated among
   the classes.
 
NOTE 2- ADVISORY FEES AND OTHER TRANSACTIONS WITH AFFILIATES
 
The Trust has entered into a master investment advisory agreement with A I M
Advisors, Inc. ("AIM"). Under the terms of the master investment advisory
agreement, the Fund pays AIM an advisory fee at an annual rate of 0.50% of the
first $200 million of the Fund's average daily net assets, plus 0.40% of the
Fund's average daily net assets in excess of $200 million to and including $500
million, plus 0.35% of the Fund's average daily net assets in excess of $500
million to and including $1 billion, plus 0.30% of the Fund's average daily net
assets in excess of $1 billion.
 
  The Fund, pursuant to a master administrative services agreement with AIM, has
agreed to reimburse AIM for certain administrative costs incurred in providing
accounting services to the Fund. During the year ended December 31, 1998, AIM
was reimbursed $80,271 for such services.
 
  The Fund, pursuant to a transfer agency and service agreement, has agreed to
pay A I M Fund Services, Inc. ("AFS") a fee for providing transfer agency and
shareholder services to the Fund. During the year ended December 31, 1998, the
Fund paid AFS $286,864 for such services.
 
  The Trust has entered into master distribution agreements with A I M
Distributors, Inc. ("AIM Distributors") to serve as the distributor for the
Class A, Class B and Class C shares of the Fund. The Trust has adopted
distribution plans pursuant to Rule 12b-1 under the 1940 Act with respect to the
Fund's Class A shares and Class C shares (the "Class A and C Plan"), and the
Fund's Class B shares (the "Class B Plan") (collectively, the "Plans"). The
Fund, pursuant to the Class A and C Plan, pays AIM Distributors compensation at
an annual rate of 0.25% of the average daily net assets of the Class A shares
and 1.00% of the average daily net assets of the Class C shares. The Fund
pursuant to the Class B Plan, pays AIM Distributors compensation at an annual
rate of 1.00% of the average daily net assets of the Class B shares. Of these
amounts, the Fund may pay a service fee of 0.25% of the average daily net assets
of the Class A, Class B or Class C shares to selected dealers
 
                                        9
<PAGE>   12
 
and financial institutions who furnish continuing personal shareholder services
to their customers who purchase and own the appropriate class of shares of the
Fund. Any amounts not paid as a service fee under the Plans would constitute an
asset-based sales charge. The Plans also impose a cap on the total sales
charges, including asset-based sales charges that may be paid by the respective
classes. During the year ended December 31, 1998, the Class A, Class B and Class
C shares paid AIM Distributors $478,781, $1,359,570 and $248,197 respectively,
as compensation under the Plans.
 
  AIM Distributors received commissions of $196,016 from sales of the Class A
shares of the Fund during the year ended December 31, 1998. Such commissions are
not an expense of the Fund. They are deducted from, and are not included in, the
proceeds from sales of Class A shares. During the year ended December 31, 1998,
AIM Distributors received $108,148 in contingent deferred sales charges imposed
on redemptions of Fund shares. Certain officers and trustees of the Trust are
officers and directors of AIM, AIM Distributors and AFS.
 
  During the year ended December 31, 1998, the Fund paid legal fees of $3,924
for services rendered by Kramer, Levin, Naftalis & Frankel as counsel to the
Board of Trustees. A member of that firm is a trustee of the Trust.
 
NOTE 3-INDIRECT EXPENSES
 
During the year ended December 31, 1998, the Fund received reductions in
transfer agency fees from AFS (an affiliate of AIM) and reductions in custodian
fees of $3,885 and $68, respectively under expense offset arrangements. The
effect of the above arrangements resulted in a reduction of the Fund's total
expenses of $3,953 during the year ended December 31, 1998.
 
NOTE 4-TRUSTEES' FEES
 
Trustees' fees represent remuneration paid or accrued to each trustee who is not
an "interested person" of AIM. The Trust may invest trustees' fees, if so
elected by a trustee, in mutual fund shares in accordance with a deferred
compensation plan.
NOTE 5-BORROWINGS
Reverse repurchase agreements involve the sale of securities held by the Fund,
with an agreement that the Fund will repurchase such securities at an
agreed-upon price and date. Proceeds from reverse repurchase agreements are
treated as borrowings. The agreements are collateralized by the underlying
securities and are carried at the amount at which the securities will
subsequently be repurchased as specified in the agreements. The maximum amount
outstanding during the year ended December 31, 1998 was $85,146,250 while
borrowings averaged $25,733,082 per day with a weighted average interest rate of
3.31%.
  The Fund will limit its borrowings from banks, reverse repurchase agreements
and dollar roll transactions to an aggregate of 33 1/3% of its total assets at
the time of investment. The Fund will not purchase additional securities when
any borrowings from banks exceed 5% of the Fund's total assets.
 
  The Fund is a participant in a committed line of credit facility with a
syndicate administered by The Chase Manhattan Bank. The Fund may borrow up to
the lesser of (i) $1,000,000,000 or (ii) the limits set by its prospectus for
borrowings. The Fund and other funds advised by AIM which are parties to the
line of credit may borrow on a first come, first served basis. Interest on
borrowings under the line of credit is payable on maturity or prepayment date.
Prior to an amendment of the line of credit on May 1, 1998, the Fund was limited
to borrowing up to the lesser of (i) $500,000,000 or (ii) the limits set by its
prospectus for borrowings. During the year ended December 31, 1998, the Fund did
not borrow under the line of credit agreement. The funds which are parties to
the line of credit are charged a commitment fee of 0.05% on the unused balance
of the committed line. The commitment fee is allocated among such funds based on
their respective average net assets for the period.
 
NOTE 6-INVESTMENT SECURITIES
 
The aggregate amount of investment securities (other than short-term securities)
purchased and sold by the Fund during the year ended December 31, 1998 was
$694,080,621 and $477,249,743, respectively.
  The amount of unrealized appreciation (depreciation) of investment securities,
on a tax basis, as of December 31, 1998 is as follows:
 
<TABLE>
<S>                                           <C>
Aggregate unrealized appreciation of
  investment securities                       $ 7,766,451
- ---------------------------------------------------------
Aggregate unrealized (depreciation) of
  investment securities                        (1,807,868)
- ---------------------------------------------------------
Net unrealized appreciation of investment
  securities                                  $ 5,958,583
=========================================================
Cost of investments for tax purposes is $609,284,821.
</TABLE>
 
NOTE 7-SHARE INFORMATION
 
Changes in shares outstanding during the years ended December 31, 1998 and 1997
were as follows:
 
<TABLE>
<CAPTION>
                                  1998                          1997
                       ---------------------------    -------------------------
                         SHARES         AMOUNT          SHARES        AMOUNT
                       -----------   -------------    ----------   ------------
<S>                    <C>           <C>              <C>          <C>
Sold:
  Class A               29,655,462   $ 283,586,927     6,693,588   $ 62,348,371
- -------------------------------------------------------------------------------
  Class B               27,535,042     264,070,374     4,448,136     41,365,183
- -------------------------------------------------------------------------------
  Class C*               6,742,689      63,813,508       734,169      6,890,070
- -------------------------------------------------------------------------------
Issued as
  reinvestment of
  dividends:
  Class A                1,069,069      10,191,327       953,629      8,857,846
- -------------------------------------------------------------------------------
  Class B                  568,105       5,430,298       349,182      3,245,433
- -------------------------------------------------------------------------------
  Class C*                 143,118       1,253,716         1,978         18,637
- -------------------------------------------------------------------------------
Reacquired:
  Class A              (22,783,533)   (217,508,626)   (8,720,230)   (80,937,816)
- -------------------------------------------------------------------------------
  Class B              (12,722,862)   (121,830,456)   (3,920,140)   (36,355,160)
- -------------------------------------------------------------------------------
  Class C*              (3,103,831)    (29,535,779)     (540,137)    (5,074,580)
- -------------------------------------------------------------------------------
                        27,103,259   $ 259,471,289           175   $    357,984
===============================================================================
</TABLE>
 
* Class C shares commenced sales on August 4, 1997.
 
                                       10
<PAGE>   13
 
NOTE 8-FINANCIAL HIGHLIGHTS
 
Shown below are the financial highlights for a share of Class A and a share of
Class B outstanding during each of the years in the five-year period ended
December 31, 1998 and for a share of Class C outstanding during the year ended
December 31, 1998 and the period August 4, 1997 (date sales commenced) through
December 31, 1997.
 
<TABLE>
<CAPTION>
                                                                                       CLASS A
                                                              ---------------------------------------------------------
                                                                1998         1997        1996        1995        1994
                                                              --------     --------    --------    --------    --------
<S>                                                           <C>          <C>         <C>         <C>         <C>
Net asset value, beginning of period                          $   9.46     $   9.28    $   9.70    $   8.99    $  10.05
- ------------------------------------------------------------  --------     --------    --------    --------    --------
Income from investment operations:
  Net investment income                                           0.62         0.63        0.63        0.69        0.68
- ------------------------------------------------------------  --------     --------    --------    --------    --------
  Net gains (losses) on securities (both realized and
    unrealized)                                                   0.13         0.18       (0.42)       0.73       (1.02)
- ------------------------------------------------------------  --------     --------    --------    --------    --------
    Total from investment operations                              0.75         0.81        0.21        1.42       (0.34)
- ------------------------------------------------------------  --------     --------    --------    --------    --------
Less distributions:
  Dividends from net investment income                           (0.63)       (0.61)      (0.59)      (0.67)      (0.58)
- ------------------------------------------------------------  --------     --------    --------    --------    --------
  Distributions from net realized gains                             --           --          --          --       (0.04)
- ------------------------------------------------------------  --------     --------    --------    --------    --------
  Return of capital                                                 --        (0.02)      (0.04)      (0.04)      (0.10)
- ------------------------------------------------------------  --------     --------    --------    --------    --------
    Total distributions                                          (0.63)       (0.63)      (0.63)      (0.71)      (0.72)
- ------------------------------------------------------------  --------     --------    --------    --------    --------
Net asset value, end of period                                $   9.58     $   9.46    $   9.28    $   9.70    $   8.99
============================================================  ========     ========    ========    ========    ========
Total return(a)                                                   8.17%        9.07%       2.35%      16.28%      (3.44)%
============================================================  ========     ========    ========    ========    ========
Ratios/supplemental data:
Net assets, end of period (000s omitted)                      $245,613     $167,427    $174,344    $176,318    $158,341
============================================================  ========     ========    ========    ========    ========
Ratio of expenses to average net assets (exclusive of
  interest expense)                                               0.96%(b)     1.00%       1.00%       1.08%       1.04%(c)
============================================================  ========     ========    ========    ========    ========
Ratio of net investment income to average net assets              6.43%(b)     6.77%       6.76%       7.36%       7.34%(d)
============================================================  ========     ========    ========    ========    ========
Portfolio turnover rate                                            147%          99%        134%        140%        109%
============================================================  ========     ========    ========    ========    ========
</TABLE>
 
<TABLE>
<S> <C>
(a) Does not deduct sales charges.
(b) Ratios are based on average net assets of $191,512,442.
(c) After fee waivers and/or expense reimbursements. Ratio of
    expenses to average net assets prior to fee waivers and/or
    expense reimbursements was 1.05% for 1994.
(d) After fee waivers and/or expense reimbursements. Ratio of
    net investment income to average net assets prior to fee
    waivers and/or expense reimbursements was 7.32% for 1994.
</TABLE>
 
<TABLE>
<CAPTION>
                                                                            CLASS B                               CLASS C
                                                       --------------------------------------------------    ------------------
                                                         1998       1997      1996       1995      1994       1998       1997
                                                       --------    -------   -------    -------   -------    -------    -------
<S>                                                    <C>         <C>       <C>        <C>       <C>        <C>        <C>
Net asset value, beginning of period                   $  9.46     $  9.28   $  9.69    $  8.99   $ 10.04    $  9.44    $  9.33
- -----------------------------------------------------  --------    -------   -------    -------   -------    -------    -------
Income from investment operations:
  Net investment income                                   0.55        0.56      0.55       0.63      0.61       0.56       0.24
- -----------------------------------------------------  --------    -------   -------    -------   -------    -------    -------
  Net gains (losses) on securities (both realized and
    unrealized)                                           0.13        0.17     (0.41)      0.70     (1.02)      0.11       0.10
- -----------------------------------------------------  --------    -------   -------    -------   -------    -------    -------
    Total from investment operations                      0.68        0.73      0.14       1.33     (0.41)      0.67       0.34
- -----------------------------------------------------  --------    -------   -------    -------   -------    -------    -------
Less distributions:
  Dividends from net investment income                   (0.55)      (0.53)    (0.51)     (0.59)    (0.50)     (0.55)     (0.22)
- -----------------------------------------------------  --------    -------   -------    -------   -------    -------    -------
  Distributions from net realized gains                     --          --        --         --     (0.04)        --         --
- -----------------------------------------------------  --------    -------   -------    -------   -------    -------    -------
  Return of capital                                         --       (0.02)    (0.04)     (0.04)    (0.10)        --      (0.01)
- -----------------------------------------------------  --------    -------   -------    -------   -------    -------    -------
    Total distributions                                  (0.55)      (0.55)    (0.55)     (0.63)    (0.64)     (0.55)     (0.23)
- -----------------------------------------------------  --------    -------   -------    -------   -------    -------    -------
Net asset value, end of period                         $  9.59     $  9.46   $  9.28    $  9.69   $  8.99    $  9.56    $  9.44
====================================================   =======     =======   =======    =======   =======    =======    =======
Total return(a)                                           7.40%       8.16%     1.61%     15.22%    (4.13)%     7.31%      3.64%
====================================================   =======     =======   =======    =======   =======    =======    =======
Ratios/supplemental data:
Net assets, end of period (000s omitted)               $237,919    $89,265   $79,443    $61,300   $23,415    $38,026    $ 1,851
====================================================   =======     =======   =======    =======   =======    =======    =======
Ratio of expenses to average net assets (exclusive of
  interest expense)                                       1.72%(b)    1.76%     1.76%      1.86%    1.82%(c)  1.72%(b)   1.76%(d)
====================================================   =======     =======   =======    =======   =======    =======    =======
Ratio of net investment income to average net
  assets(e)                                               5.68%(b)    6.01%     6.00%      6.58%   6.56%(e)   5.68%(b)    6.01%(d)
====================================================   =======     =======   =======    =======   =======    =======    =======
Portfolio turnover rate                                    147%         99%      134%       140%      109%       147%        99%
====================================================   =======     =======   =======    =======   =======    =======    =======
</TABLE>
 
<TABLE>
<S> <C>
(a) Does not deduct contingent deferred sales charges and is not
    annualized for periods less than one year.
(b) Ratios are based on average net assets of $136,546,632 and
    $24,819,682 for Class B and Class C, respectively.
(c) After fee waivers and/or expense reimbursements. Ratio of
    expenses to average net assets prior to fee waivers and/or
    expense reimbursements was 1.87% for 1994.
(d) Annualized.
(e) After fee waivers and/or expense reimbursements. Ratio of
    net investment income to average net assets prior to fee
    waivers and/or expense reimbursements was 6.50% for 1994.
</TABLE>
 
                                       11
<PAGE>   14
 
                       INDEPENDENT AUDITORS' REPORT
 
                       The Board of Trustees and Shareholders of
                       AIM Intermediate Government Fund:
 
                       We have audited the accompanying statement of assets and
                       liabilities of AIM Intermediate Government Fund (a
                       portfolio of AIM Funds Group), including the schedule of
                       investments, as of December 31, 1998, and the related
                       statement of operations for the year then ended, the
                       statement of changes in net assets for each of the years
                       in the two-year period then ended and the financial
                       highlights for each of the years in the five-year period
                       then ended. These financial statements and financial
                       highlights are the responsibility of the Fund's
                       management. Our responsibility is to express an opinion
                       on these financial statements and financial highlights
                       based on our audits.
                         We conducted our audits in accordance with generally
                       accepted auditing standards. Those standards require that
                       we plan and perform the audit to obtain reasonable
                       assurance about whether the financial statements and
                       financial highlights are free of material misstatement.
                       An audit includes examining, on a test basis, evidence
                       supporting the amounts and disclosures in the financial
                       statements. Our procedures included confirmation of
                       securities owned as of December 31, 1998, by
                       correspondence with the custodian and brokers. An audit
                       also includes assessing the accounting principles used
                       and significant estimates made by management, as well as
                       evaluating the overall financial statement presentation.
                       We believe that our audits provide a reasonable basis for
                       our opinion.
                         In our opinion, the financial statements and financial
                       highlights referred to above present fairly, in all
                       material respects, the financial position of AIM
                       Intermediate Government Fund as of December 31, 1998, the
                       results of its operations for the year then ended, the
                       changes in its net assets for each of the years in the
                       two-year period then ended and the financial highlights
                       for each of the years in the five-year period then ended,
                       in conformity with generally accepted accounting
                       principles.
 
                                                    KPMG LLP
 
                       Houston, Texas
                       February 5, 1999
 
                                       12
<PAGE>   15
 
 
<TABLE>
<CAPTION>
BOARD OF TRUSTEES                                  OFFICERS                                OFFICE OF THE FUND

<S>                                                <C>                                     <C>
Charles T. Bauer                                   Charles T. Bauer                        11 Greenway Plaza
Chairman                                           Chairman                                Suite 100
A I M Management Group Inc.                                                                Houston, TX 77046
                                                   Robert H. Graham
Bruce L. Crockett                                  President                               INVESTMENT ADVISOR
Director
ACE Limited;                                       John J. Arthur                          A I M Advisors, Inc.
Formerly Director, President, and                  Senior Vice President and Treasurer     11 Greenway Plaza
Chief Executive Officer                                                                    Suite 100
COMSAT Corporation                                 Carol F. Relihan                        Houston, TX 77046
                                                   Senior Vice President and Secretary
Owen Daly II                                                                               TRANSFER AGENT
Director                                           Gary T. Crum
Cortland Trust Inc.                                Senior Vice President                   A I M Fund Services, Inc.
                                                                                           P.O. Box 4739
Edward K. Dunn Jr.                                 Dana R. Sutton                          Houston, TX 77210-4739
Chairman, Mercantile Mortgage Corp.;               Vice President and Assistant Treasurer
Formerly Vice Chairman and President,                                                      CUSTODIAN
Mercantile-Safe Deposit & Trust Co.; and           Robert G. Alley
President, Mercantile Bankshares                   Vice President                          State Street Bank and Trust Company
                                                                                           225 Franklin Street
Jack Fields                                        Stuart W. Coco                          Boston, MA 02110
Chief Executive Officer                            Vice President
Texana Global, Inc.;                                                                       COUNSEL TO THE FUND
Formerly Member                                    Melville B. Cox
of the U.S. House of Representatives               Vice President                          Ballard Spahr
                                                                                           Andrews & Ingersoll, LLP
Carl Frischling                                    Karen Dunn Kelley                       1735 Market Street
Partner                                            Vice President                          Philadelphia, PA 19103
Kramer, Levin, Naftalis & Frankel
                                                   Jonathan C. Schoolar                    COUNSEL TO THE TRUSTEES
Robert H. Graham                                   Vice President
President and Chief Executive Officer                                                      Kramer, Levin, Naftalis & Frankel
A I M Management Group Inc.                        Renee A. Friedli                        919 Third Avenue
                                                   Assistant Secretary                     New York, NY 10022
Prema Mathai-Davis
Chief Executive Officer, YWCA of the U.S.A.,       P. Michelle Grace                       DISTRIBUTOR
Commissioner, New York City Dept. for              Assistant Secretary
the Aging; and member of the Board of Directors,                                           A I M Distributors, Inc.
Metropolitan Transportation Authority of           Jeffrey H. Kupor                        11 Greenway Plaza
New York State                                     Assistant Secretary                     Suite 100
                                                                                           Houston, TX 77046
Lewis F. Pennock                                   Nancy L. Martin
Attorney                                           Assistant Secretary                     AUDITORS

Ian W. Robinson                                    Ofelia M. Mayo                          KPMG LLP
Consultant; Formerly Executive                     Assistant Secretary                     700 Louisiana
Vice President and                                                                         Houston, TX 77002
Chief Financial Officer                            Lisa A. Moss
Bell Atlantic Management                           Assistant Secretary
Services, Inc.
                                                   Kathleen J. Pflueger
Louis S. Sklar                                     Assistant Secretary
Executive Vice President
Hines Interests                                    Samuel D. Sirko
Limited Partnership                                Assistant Secretary

                                                   Stephen I. Winer
                                                   Assistant Secretary

                                                   Mary J. Benson
                                                   Assistant Treasurer
</TABLE>

 
REQUIRED FEDERAL INCOME TAX INFORMATION
AIM Intermediate Government Fund Class A, Class B, and Class C shares paid
ordinary dividends in the amount of $0.63, $0.552, and $0.552 per share,
respectively, to shareholders during the Fund's tax year ended December 31,
1998.
 
STATE INCOME TAX INFORMATION
Of the total income dividends paid, 24.56% were derived from U.S. Treasury
obligations.
<PAGE>   16
                                 THE AIM FAMILY OF FUNDS--Registered Trademark--


<TABLE>
<S>                                               <C>                                              <C>
GROWTH FUNDS                                      MONEY MARKET FUNDS                                A I M Management Group Inc. has
AIM Aggressive Growth Fund(1)                     AIM Money Market Fund                             provided leadership in the     
AIM Blue Chip Fund                                AIM Tax-Exempt Cash Fund                          mutual fund industry since 1976 
AIM Capital Development Fund                                                                        and managed approximately $109 
AIM Constellation Fund                            INTERNATIONAL GROWTH FUNDS                        billion in assets for more than 
AIM Mid Cap Equity Fund(2),(A)                    AIM Advisor International Value Fund              6.2 million shareholders,      
AIM Select Growth Fund(3)                         AIM Asian Growth Fund                             including individual investors,
AIM Small Cap Growth Fund(2),(B)                  AIM Developing Markets Fund(2)                    corporate clients, and         
AIM Small Cap Opportunities Fund                  AIM Europe Growth Fund(2)                         financial institutions, as of  
AIM Value Fund                                    AIM European Development Fund                     December 31, 1998.             
AIM Weingarten Fund                               AIM International Equity Fund                        The AIM Family Of Funds--  
                                                  AIM Japan Growth Fund(2)                          Registered Trademark-- is      
GROWTH & INCOME FUNDS                             AIM Latin American Growth Fund(2)                 distributed nationwide, and AIM 
AIM Advisor Flex Fund                             AIM New Pacific Growth Fund(2)                    today is the 10th-largest      
AIM Advisor Large Cap Value Fund                                                                    mutual fund complex in the U.S.
AIM Advisor MultiFlex Fund                        GLOBAL GROWTH FUNDS                               in assets under management,    
AIM Advisor Real Estate Fund                      AIM Global Aggressive Growth Fund                 according to Strategic Insight,
AIM Balanced Fund                                 AIM Global Growth Fund                            an independent mutual fund     
AIM Basic Value Fund(2),(C)                                                                         monitor.
AIM Charter Fund
                                                  GLOBAL GROWTH & INCOME FUNDS                      
INCOME FUNDS                                      AIM Global Growth & Income Fund(2)                
AIM Floating Rate Fund(2)                         AIM Global Utilities Fund                         
AIM High Yield Fund                                                                                 
AIM High Yield Fund II                            GLOBAL INCOME FUNDS                               
AIM Income Fund                                   AIM Emerging Markets Debt Fund(2),(D)             
AIM Intermediate Government Fund                  AIM Global Government Income Fund(2)              
AIM Limited Maturity Treasury Fund                AIM Global Income Fund                            
                                                  AIM Strategic Income Fund(2)                      
TAX-FREE INCOME FUNDS                                                                               
AIM High Income Municipal Fund                    THEME FUNDS                                       
AIM Municipal Bond Fund                           AIM Global Consumer Products and Services Fund(2) 
AIM Tax-Exempt Bond Fund of Connecticut           AIM Global Financial Services Fund(2)             
AIM Tax-Free Intermediate Fund                    AIM Global Health Care Fund(2)                    
                                                  AIM Global Infrastructure Fund(2)                 
                                                  AIM Global Resources Fund(2)                      
                                                  AIM Global Telecommunications Fund(2)             
                                                  AIM Global Trends Fund(2),(E)                     
</TABLE>

(1) AIM Aggressive Growth Fund reopened to new investors November 16, 1998. (2)
Effective May 29, 1998, A I M Advisors, Inc. became advisor to the former GT
Global Funds. (3) On May 1, 1998, AIM Growth Fund was renamed AIM Select Growth
Fund. (A) On September 8, 1998, AIM Mid Cap Growth Fund was renamed AIM Mid Cap
Equity Fund. (B) On September 8, 1998, AIM Small Cap Equity Fund was renamed AIM
Small Cap Growth Fund. (C) On September 8, 1998, AIM America Value Fund was
renamed AIM Basic Value Fund. (D) On September 8, 1998, AIM Global High Income
Fund was renamed AIM Emerging Markets Debt Fund. (E) On September 8, 1998, AIM
New Dimension Fund was renamed AIM Global Trends Fund. For more complete
information about any AIM Fund(s), including sales charges and expenses, ask
your financial consultant or securities dealer for a free prospectus(es). Please
read the prospectus(es) carefully before you invest or send money.



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