Though not clearly specified, the question suggests that we rewrite the sentences so that they will be in their pastcontinuous forms. The answers have been provided below;
1. While we were having dinner, the phone rang.
2. When we were sleeping, there was a knock at the door.
3. The phone rang when she was having a bath.
4. While we were taking our English lesson, the lights went out.
5. While I was having dinner, the phone rang.
6. While we were sleeping, a burglar broke into our house.
7. When you phoned Anne, she was taking her lunch.
8. While I was having dinner, my friend came to visit me.
9. While we were taking our English lesson, the phone rang.
10. When Dana attended a party, the blizzard was started.
11. While she drove home, she was listening to her car radio.
12. She heard about the accident while listening to the news.
13. While she was talking to the police, she thought about her editorial for the morning paper.
14. While the pupils were playing games, the teacher came in.
15. While it was raining heavily, he went out without a raincoat.
16. When the cup broke, Mary was washing up.
The past continuous form of a verb typically begins with the subject, was/were, and a verb ending in -ing. It shows an action that was in progress at a particular time in the past. The sentences above, are in their past continuous forms.
