1. must not
2. must
3. don’t have to
4. should
5. have to
6. can’t
7. couldn’t
8. had to
9. will be able to
10. able to
11. ought
12. needn’t
13. should
14. need to
15. able to
16. may
17. aren’t allowed to
18. could
19. May
20. must
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Answers & Comments
1. must not
2. must
3. don’t have to
4. should
5. have to
6. can’t
7. couldn’t
8. had to
9. will be able to
10. able to
11. ought
12. needn’t
13. should
14. need to
15. able to
16. may
17. aren’t allowed to
18. could
19. May
20. must