ĐỘNG TỪ (VERBS)

I. 1. i

1. t
2. t
3. i
4. i
5. t
6. i
7. i
8. t
9. i
10. i
11. t
12. i
13. t
14. i

II. 3. must

1. had to
2. don't have to
3. have to
4. must
5. mustn't
6. must/ have to
7. doesn't have to
8. has had to
9. have to
10. mustn't
11. have to
12. must/ have to
13. don't have to
14. had to
15. must
16. mustn't
17. didn't have to
18. have to
19. has to/ must
20. don't have to
21. mustn't
22. must

III. 1. needn't - mustn't

1. mustn't - needn't
2. needn't - must
3. mustn't - must
4. mustn't - needn't
5. mustn't - must - needn't
6. must - mustn't
7. must - needn't

IV. 2. can/ is able to

1. be able to
2. can't/ am not able to