1. He was talking with Mary, when Mrs. Smith came in.
2. They studiedtwo hours last night.
3. Jane was sleeping when the telephone rang.
4. As I was walking to the lab, I met my friend.
5. We watched TV last night.
6. The customer was paying his cheque when he dropped his credit card.
7. The barber cut my hair yesterday.
8. She was dancing when she hurt her ankle.
9. It was raining hard when I got up.
10. It rained hard last night.