3. don't need to;

4. had to;

5. must;

6. mustn't;

7. must/had to;

8. had to;

9. don't need to;

10. mustn't.

3 don't need to

4 had to

5 mast

6 mastn't

7 mast/ had to

8 had to

9 don't need to

10mastn't