Past Modals of Deduction
Rewrite the sentences using Past Modals of Deduction and the correct form of the verb

1. It's possible that I made a big mistake.
2. Perhaps Stonehenge was royal tomb.
3. I'm sure she didn't drive to work today.
4. It's possible that the crunch walls were painted by Giotto.
5. The place was definitely built here in the 12th Century.
6. They aren't at home. They're probably on their way to the station right now.
7. it is impossible that that was my jacket.
8. I am expecting a call from Sheila. The phone is ringing now.
9. I think it's possible that I've seen this movie before.
10. There's a possibility that he's already left.