1. He mustn't be at school, I saw him at the gym.
2. She must be 30 years old.
3. He must be the murderer.
4. Congratulations on passing your exam! You must be very happy.
5. The jacket you bought is very good quality. It must have been very very expensive.
6. She must have gone home early.
7. We should invite a lot of people to (et pas <<at>>) to our party.
8. You look tired. You should go to bed early.
9. Imagine how the immigrants must have felt when they arrived in New York. They must have been amazed.
