1. He’s a brilliant student – he doesn’t have to work hard to get good marks.
2. You can stay up late, but you mustn’t make a lot of noise and wake up your sister.
3. We mustn’t forget the name of our hotel.
4. She always pays by credit card so that she doesn’t have to carry a lot of money with her.
5. You mustn’t tell Jack about the party – it’s a secret!
6. The bus leaves at 9 a.m. exactly, so you mustn’t be late.
7. We don’t have to wear a uniform to school, but we mustn’t wear jeans or trainers