His doctor told Peter that he should eat more fruits and vegetables. (OUGHT)
→ His doctor told Peter that he ought to eat more fruits and vegetables.

Listen! That may be Lisa—she said she'd call at 4:30. (MIGHT)
→ Listen! That might be Lisa—she said she'd call at 4:30.

We studied nearly 20 hours for the chemistry test because the teacher was absent again. (NEEDN'T)
→ We needn't have studied nearly 20 hours for the chemistry test because the teacher was absent again.

Smoking is not allowed in restaurants, schools, and offices. (MUSTN'T)
→ You mustn't smoke in restaurants, schools, and offices.

It isn't necessary to bring all your books to school every day. (HAVE)
→ You don't have to bring all your books to school every day.

I think you should give up smoking immediately. (HAD)
→ You had better give up smoking immediately.

I expect we will get there by 5:00, if there isn't too much traffic. (SHOULD)
→ We should get there by 5:00 if there isn't too much traffic.

Is it necessary for me to bring my passport? (HAVE)
→ Do I have to bring my passport?

I am sure that the cat is in the house somewhere. (MUST)
→ The cat must be in the house somewhere.

An aerial is not required with this radio. (HAVE)
→ This radio doesn’t have to have an aerial.