Ex 1 :

do-did-done

go-went-gone

drive-drove-driven

hit-hit-hit

break--broke-broken

eat-ate-eaten

be-was/were-been

find-found-found

fight-fought-fought

watch-watched-watched

close-closed-closed

see-saw-seen

meet-met-met

have-had-had

drink-drank-drunk

lose-lost-lost

put-put-put

spend-spent-spent

get-got-got

work-worked-worked

swim-swam-swum

cut-cut-cut

Ex2: 

1) have done

2) has written

3) haven't met

4) has left

5) haven't seen

6) has bought

7) has never seen

8) has been

9) have travelled

10) has told

Ex 3 :

1) since

2) for

3) for

4) since

5) for

6) since

7) for

8) for

9) since

10) for

11) for

12) since

13) since

14) for

15) for

16) for

17) since

18) for

19) for

20) since

bài 1/

1/ do-did-done

2/ go-went-gone

3/ drive-drove-driven

4/ hit-hit-hit

5/ break-broke-broken

6/ eat-ate-eaten

7/be-was/were-been

8/find-found-found

9/ fight-fought-fought

10/ watch-watched-watched

11/ close-closed-closed

12/ see-saw-seen

13/ meet-met-met

14/ have-had-had

15/ drink-drank-drunk

16/ lose-lost-lost

17/ put-put-put

18/ spend-spent-spent

19/ get-got-got

20/ work-worked-worked

21/ swim-swam-swum

22/ cut-cut-cut

bài 2/

1/ am doing

2/ have wrote 

3/ have ever met

4/ leaves

5/ havn't seen

6/ bought

7/ has ever seen

8/ was

9/ is traveling

10/ is telling

bài 3

1/ sicne 

2/ for

3 since

4 for

5 for

6 since

7 for

8 since

9 since

10 since

11 for 

12 since

13for 

14 for

15 since

16 for 

17 since

18 since

19 for

20 since