1. When I arrived at this house, he was still sleeping. 2. The light went out while we were having dinner. 3. Bill was having breakfast when I stopped at this house this morning. 4. She was washing up when Tam arrived at this house. 5. As we were crossing the street, we saw an accident. 6. Tom saw a serious accident while he was standing at the bus stop. 7. The children were playing football when their mother came back home. 8. The bell rang while Tom was taking a bath. 9. He was sitting in a car when I saw him. 10. We were cleaning the house when she came yesterday.