Read and underline. Then act out.

1 A: You must/mustn't put your hand up to ask a question.

B: OK, Miss.

2 A: What's the matter.Officer?

B: You must/mustn't park your car here.

3. A: You must/mustn't do any sports for two weeks.

B: OK, thank you, doctor.

4 A: You must/mustn't buy a ticket before you get on the bus.

B: Really? Where do I get one from?