Verified answer

b

2 Doctors don't have to be good at painting.

3 A teacher doesn't have to know everything.

4 We have to do the washing-up after lunch.

5 You don't have to get up early tomorrow.

6 Roberto doesn't have to work during the holidays.

c

2 havу to

3 has to

4 have to

5 doesn't have to

6 don't have to