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1. I was studying...

2. While I was studying...

3. I was watching TV...

4. ... she was writing…

5. ...we were having...

6. Sally was working...

7. ...was sleeping…

8. ...I was eating…

9. I was studying while he was making...

10. ... was reading... was watching…

11. They were eating dinner, discussing their plans and having a good time.

12. When her husband came home, Anne was watching television.

13. I was preparing dinner when the telephone rang.

14. What were you doing yesterday at 10 p.m.?

15. Julie learnt to drive when she was working in London.

16. Where were you sitting when the show began?

17. I visited Athens while I was touring Greece.

18. John fell down when he was crossing the street.

19. What did you see while you were waiting for the bus?

20. Where were you going when your car broke down?

21. Julie met Peter when she was walking in the park.