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2. Someone must have forgotten to lock the door.
3. They have bought this house for ten years.
4. At the end of the course, we had a big party.
5. The pop star that we invited onto the chat show didn't turn up.
6. Despite her saying that she would come, I don’t think she ever will.
7. No sooner had the plane left than the accident happened.
8. Had you slept very well last night, you wouldn't feel tired now.
9. How long is it since you started the project
10. The church which their wedding will be held is lovely.

Ex7/
1. My father doesn't play football anymore.
2. I was given a present on my last birthday by Jane.
3. She suggests going swimming.
4. He offered me a cup of coffee.
5. If we had had a map, we wouldn't have got lost in the jugle.
6. I haven't seen Bob since I was in Ho Chi Minh City.