1.I was doing my homework when my mother came from work.
2.She was reading a book when the telephone rang.
3.What was you doing when father came home?
4.They are playing football.
5.He was not taking his exam at 12 o'clock yesterday.
6.They were not sleeping when i came home.
7.Were they sleeping when you came home?
8.What were they doing when you came home?