3 Look at the library rules and make sentences with must or mustn't. Don't make any noise. Be quiet. Don't eat or drink. Be careful with the books. Don't leave books on the table when you leave. Put the books back in the right place.

Решение:

Формируем предложения, используя правила поведения в библиотеке, с модальными глаголами 'must' (должен) и 'mustn't' (не должен).

1. You mustn't make any noise.
2. You must be quiet.
3. You mustn't eat or drink.
4. You must be careful with the books.
5. You mustn't leave books on the table when you leave.
6. You must put the books back in the right place.