1. When my mother came home, I was having dinner.
2. When Kate returned, I was listening to the radio.
3. When mother enter his room, her son was drawing a picture.
4. When my sister came in, I was doing my lessons.
5. My friend was playing with his cat when I came to see him.
6. When we were doing our homework, our sister left home.
7. They were disscussing the latest ivents when telephone rang.
8. The young people were dancing when Icame to the party.
9. When he was washing the dishes, he broke a plate.
10. What were they doing when you saw them?