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.
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.