Here are completed sentences in the past continuous tense:

1. They were taking the exam.
2. When he was working there?
3. They were drinking coffee when you arrived.
4. We were talking when the accident happened.
5. He was not exercising enough.
6. Why was he studying on a Saturday night?
7. I was going to school when you saw me.
8. She was working when I called.
9. We were not leaving when you called.
10. Were we making too much noise?