I. Choose the correct answer I can / must go to the doctor. I’m feeling ill.
You could / may open your books. May / Must I have some more tea?
They can’t / mustn’t give alcohol to the animals.
That collar is too expensive. We can’t / may not buy it.
You must / mustn’t be home by 10 o’clock. I’ll be waiting for you.
I’m afraid I may not / can’t go to the dentist with you.
May / Can I take your dog to the vet? I’ve already told you!
You can’t / couldn’t eat any more sweets!
Yes, you may / must go out with your friends.