1. He must be jealous of her.
2. You shouldn't have refused his proposal.
3. He might be arrested at the customs.
4. He is unlikely to have paid the loan bank before the deadline.
5. She needn't have rushed to the airport.
6. They can't have gone to bed on such a starry night.
7. He can't have done it on purpose.
8. You don't have to learn all those formulas by heart.
9. My sister must have passed the exam.
10. You don't need to help me.
11. I couldn't ask him to drop in.
12. Mr. Smith couldn't join Billy on that trip.
13. You ought to stop being such a couch-potato and help me!
14. You shouldn't have yawned during the interview.
15. She must have been discouraged by the doctors about the plastic surgery.
16. He shouldn't have sent his parents to an old men's home.
17. They can't be torn apart.
18. She must suffer from homesickness.
