Réponse:
1. You must wear a tie if you want to go to that restaurant. It is one of their rules!
2. I have to go away on business, my boss wants me to visit our firm in Japan.
3. Don't be silly, you have to take these tablets four times a day !
4. You mustn't speak too loud, the baby is sleeping.
5. I have to work my english : I want to speak fluently.
6. This room is a mess, I really have to find time to clean it !
7. You musn't smoke in Paul's car or he 'll get very angry with you !
8. You don't have to do that Jane, I'll do it later, don't worry.
9. You really must stop driving so fast or you'll have an accident !
10. I really have to remember to post that letter before five o'clock.
