I.1. must, might
2. should
3. can, have to
4. shouldn't, can
5. could
6. must
7. could
8. could, can
9. should, don't have
10. should, might
II.
1. mustn't
2. mustn't
3. don't have to
4. mustn't
5. doesn't have to
6. doesn't have to
7. don't have to
8. mustn't
9. mustn't
10. mustn't
11. doesn't have to
12. don't have to
13. mustn't
14. don't have to
15. mustn't
16. don't have to
17. mustn't
18. mustn't
19. don't have to
20. doesn't have to
