Make these sentences interrogative.
1. The sick was sleeping when the doctor came.
2. He was eating dinner when we came.
3. The little boy was fishing when he fell into the river.
4. She was walking along the street when she an old friend.
5. He often went to the British Museum when he was studying at London University.
6. Jack was doing his homework when his father came home from work.
7. It was raining when I left home.

Добавляешь на слова was  окончание nt.Например wasn't.