Bài 1:

1.can't/can

2.must

3.must

4.mustn't

5.can't/could

6.can't

7.can't

8.can

9.couldn't 

10.must

11.could

12.can't

13.mustn't

14.can

15.couldn't

16.mustn't

17.must

18.can't

19.coudn't

20.can't

21.can't

22.can't/could

23.must

24.can't

25.can

Bài 2:

1.are you coming

2.does he eat

3.am working

4.does he come

5.is playing

6.do you come

7.aren't coming

8.isn't playing

9.are you playing

10.go

11.doesn't go

12.arrive

13.eats

14.do you study

15.do they work.

16.don't go

17.am not working

18.is she working

19.don't drink

20.is sleeping

Chúc bạn học tốt!

b1

1. can't, can

2 must

3. must

4. musn't

5. can't, could

6. can't

7. must

8. can

9. can't

10. must

11. can

12. can't

13. musn't

14. can

15. couldn't

16. musn't

17. musn't

18. must

19. ?

20. must

21. can;t

22. can, couldn't

23. must

24. can't

25. must

b2

1. Do you come tonight ?

2. does he eat rice everyday ?

3. i am working at the moment

4. does he come

5. he is playing

6. do you come

7. they do not come

8. he is not playing

9. do you play

10. they go

11. she does not go

12. arrive

13. eats

14. do you study

15. do they work

16. do not go

17. do not work

18. is she working

19. do not drink

20. is sleeping