4. She was washing up when Vinh 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. 1. I was going down the street when it began to rain. 2. At this time last year, I was attending an English course. 3. Jim was standing under the tree when he heard an explosion. 4. The boy fell and hurt himself while he was riding a bicycle. 5. When we met them last year, they were living in Santiago. 6. The tourist lost his camera while he was walking around the city. 7. The lorry was going very fast when it hit our car. 8. While I was studying in my room, my roommate was having a party in the other room. 9. Mary and I were leaving the house when the telephone rang. 10. We were sitting in the cafe when they saw us.