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.