1. don't have to
2. mustn't
3. must
4. mustn't
5. don't have to
6. mustn't
7. have to
8. doesn't have to
9. don't have to
10. has to
11. have to
12. must
13 has to
14 had to
15. must
16. mustn't
17. must
18. don't have to
19. must
20. has to
21. must
22. have to
23. has to
24. don't have to
25. don't have to
26. mustn't
27. have to
28. mustn't
29. have to
30. have to