1. Complete the sentences with must/may/need. 1. You ______ not say anything if you don't want to. 2. I can hear you quite well. You ______ not shout. 3. He has left the army and doesn't ______ to wear a uniform any more. 4. I've bought everything, so you ______ not go shopping. 5. Tim gave me a letter to post. I ______ not forget to post it.

Решение:

1. You must not say anything if you don't want to. (Это правило или запрет, который нужно соблюдать).
2. I can hear you quite well. You must not shout. (Это необходимость или запрет, который нужно соблюдать).
3. He has left the army and doesn't have to wear a uniform any more. (Это отсутствие необходимости).
4. I've bought everything, so you don't need to/don't have to not go shopping. (Это отсутствие необходимости).
5. Tim gave me a letter to post. I must not forget to post it. (Это сильная рекомендация или обязанность).

Ответ: 1. must; 2. must; 3. have to; 4. don't need to/don't have to; 5. must.