1. Has your son graduated the university?
2. Did his daughter finish school last year?
1. He was writnig a letter, when I came in.
2. He was doing his job, while his brothers were playing football.
3. I fall, when i was running after the bus.
4. We were doing our homework, when the rain started.
5. When a teacher was giving a lesson a new teacher entered the class.
6. When the telephone rang I was working in the garden.
7. I saw my classmates when I was walking down the street.
8. The rain started when we were watching the game.