1. I was walking down the street when I saw an accident.

2. I didn`t met my old friend while I was staying in Prague.

3. She walked into a tree when she was talking on her mobile phone.

4. While shopping he lost his wallet.

5. When I was doing the washing-up, I broke a glass.

6. They were driving home when petrol ran out.

7. He broke the key while he was trying to ppen the door.

8. We weren`t swim when we heard the screams.