At first- direct speech, then - reported speech.

1. - They mustn't work in the park.
     ? Must they work in the park?
     Yes, they must.
     No, they mustn't.
2. - I didn't have to take a bus yesterday.
    ? Did you have to take a bus yesterday?
     Yes, I did.
      No, I didn't.
3. - She can't draw well.
    ? Can she draw well?
     Yes, she can.
      No, she can't.
4. - We can't read and write English well.
    ? Can we read and write English well?
     Yes, we can,
      No, we can't.
5. - I am not allowed to go out on cold days.
    ? Are you allowed to go out on cold days?
     Yes, I am.
      No, I am not.