Помогите пожалуйста
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