1. When we came in, the children were cleaning their desks.
2. When we came the family was getting everything ready for Christmas. Bob and Helen were decorating the Christmas tree.
3. When I was washing the floor, I found my old toy under the sofa.
4. When granny was reading a book on the sofa, she fell asleep.
5. When I was playing in the yard, I suddenly saw my old friend.
6. When Nick was running about in the yard, he fell.
7. You slept for three hours in the afternoon.
8. My mother was dusting the furniture when I came home yesterday.