Đáp án:

Pic1

Ex1

1. should 

2. Should - should

3. shouldn't 

4. should

5. shouldn't

6. Should - shouldn't

7. should

8. shouldn't

Ex2

1. wasn't

2. weren't

3. left

4. was

5. told

6. didn't have

7. didn't know

8. bought

Ex3

1. have never watched

2. watched

3. had read

4. read

5. had

6. have read

7. haven't seen - saw

8. rang 

9. met - has come

10. hasn't drunk

Ex4

1. has seen

2. have finished

3. have lived

4. has just washed

5. have discussed

6. has never been

12. have ... recorded

13. have worked

14. Have ... washed

15. have entered - has written

16. has been

17. has ... come

18. have postponed - has rained

19. Have ... had - have - have eaten

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Pic2

9. have been

10 stayed

Ex13

1. did

2. has written - hasn't finished

3. left - have never met

4. have ... had

5. did ... do - played

6. bought - hasn't worn

7. has ... taken

8. was - arrived

Ex15

1. does hoa speak

2. borrows

3. starts

4. is climbing

5. Do .. like

6. get up

7. isn't doing

8. be

9. Do ... take

10. are

Ex16

1. will give

2. stand

3. eats

4. will telephone

5. will arrest

6. reads

7. will steal

8. doesn't open

9. washes

10. needs

Ex17

1. was - caught

2. is waiting

3. go 

4. would feel

5. to eat

6. didn't come

7. has never taken

8. was - arrived

9. read 

10. got

Ex23

1. Have ... been

2. Have ... eaten

3. hasn't come

4. have worked

5. hasn't played

6. have never watched

7. have travelled

8. have read

9. haven't planned

10. have seen

11. haven't given

12. have read

13. have owned

14. have lost

15. has left

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