Ex1;

do -did -done                                 fight- fought- fought

go- went- gone                               watch- watched- watched

drive- drove- driven                         close- closed- closed

hit- hit- hit                                        see- saw- seen

break- broke- broken                     meet- met- met  

eat- ate- eaten                                have- has- had

be- was/were- been                        drink- drank- drunk

find- found- found                          lose- lost- lost

put- put- put                                   spend- spent- spent

get- got- gotten                              work- worked- worked

swim- swam- swum                          cut- cut- cut

Ex2:

1.C         2.B             3.D               4. D                    5.C

Ex:3

* Thể khẳng định

1. have bought                         8. have made

2. has written                             9. has started

3. has been                               10. have turned

4. have been

5. has visited

6. has been

7. have eaten

* Thể phủ định

1. hasn't seen

2. haven't planed

3. haven't started

4. hasn't come

5. haven't done

6. hasn't had

7.hasn't played

8.haven't had

9.haven't seen

Ex 1: 

do→did→done

go→went

drive 

hit

break→broke→broken

eat→ate→eaten

be→was/were→been

find→found→found

fight

watch→watched

close→closed

see→saw→seen

meet→met→met

have→had→had

drink→drank→drunk

lose→lost→lost

put→put→put

spend→spent

get→got→gotten

work→worked

swim→swam→swum

cut→cut→cut

Ex 3: 

buy : bought 

write : written 

be :been 

visit : visited 

eat : ate