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phần 1

1 since

2 for

3 for 

4 since

5 for

6 since

7 since

8 for

9 since

10 for

11 for

12 since

13 since

14 for

15 for

16 for

17 sice

18 for

19 for

20 since (trước since HTHT sau since QKĐ)

phần 2

1 did

2 has written /has not finished

3 left/have never met

4 have you had

5 did you do/ did you play

6 bought/has not wore

7 has taught/ graduated

I. 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

II. 

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

III.

1. have done

2. has written/ hasn't finished

3. left/ have never met

4. have you had

5. did you do/ played

6. bought/ hasn't worn

7. has taught/ graduated