1. what are you doing tonight?
2. how often do they visit their parents?
3. I'm waiting for you for 2 hours.
4. He has been slipping since ..........
5. I've never been to Australia.
6. Peter was cooking when the phone rang.
7. Betty had been writing since 9 o'clock. She has written seven reports up to know.
8. took, left,drove
9. What were you doing when we called you yesterday?
10. you have ever given
11. I didn't go to school yesterday
12. had already cooked dinner