He has to/ can't do his homework every day.
He has to do his homework every day.
You mustn't/ don't have to eat in the classroom. It isn't allowed.
You mustn't eat in the classroom. It isn't allowed.
You mustn't/ don't have to water the plants. I'll do that.
You don't have to water the plants. I'll do that.
He can go out but he need/ hast to be back by 10.
He can go out but he hast to be back by 10.
He is ill. He must/ has to see a doctor.
He is ill. He has to see a doctor.
You must/ needn't stop at the red light.
You must stop at the red light.
Pilots have to/ can't wear a uniform.
Pilots have to wear a uniform.
You mustn't/ don't have to be late. It's an important meeting.
You mustn't be late. It's an important meeting.
Do I have to/ Needn't I finish it today?
Do I have to finish it today?
You mustn't/needn't wear a sweater. It's warm outside.
You needn't wear a sweater. It's warm outside.