1. He broke the plate while he was washing the dishes
2. I was listening to radio when Alice returned
3. When mother entered his room, he was drawing a picture
4. When my sister came in, i was doing my lessons
5. She catched cold while her mum was airing the room
6. She was going to the office when I met her
7. When my father came home, I was having dinner
8. He was washing his face when somebody knocked the door
9. The young people were dancing when I came to the party