Помогите! 30 баллов!

1. While I was waiting for the bus, I met my friend Ercan.
2. She was cooking dinner when the telephone rang.
3. It began to rain while they were sitting in the garden.
4. While she was driving home, she had an accident.
5. While we were watching TV, the cat stole the dinner.
6. I was writting a letter when my friend came into the room.
7. The robber broke the window while she was sleeping upstairs.
8. The computer broke down while he was writting an e-mail.
9. When I saw Ayse, she was quarreling with her boyfriend.
10. While they were watching a video, Mum was cooking lunch.