1. They were fishing when Jack fell into the water.
2. We were climbing the mountain when the rocks fell.
3. I lost my money when I was going to the shops.
4. I broke my leg while I was skiing.
5. We were dancing at the disco when we see Mary.
6. It was raining when I went out.
7. He was going for a walk when he met Jane.
8. The telephone was ringing while I was eating my dinner.
9. They were sitting in the garden when it started to rain.
10. He was driving to work when he had an accident.