4 Complete the sentences with must or mustn't.
1 You
use your mobile
phone in the classroom.
2 give the dog some water.
He's thirsty.
3 Stop it! You be rude to
people.
4. go home now. It's late.
5 They
drop litter.​

4 Complete the sentences with must or mustn't.

1 You mustn't use your mobile phone in the classroom.

2 You must give the dog some water. He's thirsty.

3 Stop it! You mustn't be rude to people.

4. I must go home now. It's late.

5 They mustn't drop litter.​