Obligation and Prohibition

You ought to / have to pay a fine if you don’t return your library books on time.

Jerry doesn’t have to / mustn’t get up early this morning. He isn’t going to work.

He doesn’t have to / shouldn’t watch so much TV. It’s a waste of time.

If you’re late for class, you ought to / should say sorry to the teacher.

When I was a child, I had to / must tidy my room every weekend.

You mustn’t / don’t have to touch electrical things when your hands are wet. It’s very dangerous.

You must / have to get a visa if you want to go to Cuba.

It’s Hannah’s birthday tomorrow. I mustn’t / shouldn’t forget to phone her.

Living at home is great. I mustn’t / don’t have to do anything because my mum does it all for me!

No, thanks. I mustn’t / shouldn’t eat any more cake. I’m on a diet.

I think you should / must go to bed early tonight. You look really tired.