1. Will you go to the dentist with me?
2. They had made a serious error.
3. He has seemed happy every day this week.
4. The children may play for an hour.
5. Instructors should always help their students.
6. In another ten minutes, I will have been waiting for four hours.
7. My guitar has been out of tune for weeks.
8. Have you repaired that flat tire?
9. You should have repaired it last week.
10. They were hoping for straight A's this semester.
11. He has never played Monopoly before.
12. Can you polish the mirrors for the party?
13. Her furniture has seen better days.
14. These flowers are wilting.
15. They could have tried harder.