Jawaban:

1. Brenda was eating breakfast when her friends called yesterday morning.

2. We were discussing our plans while they prepared something yesterday morning

3. He got a phone call from my father when he was working in the office yesterday morning

4. Jenny was cooking the lunch when her friends came to her house

5. When she came to my house last night, I was typing this letter.

6. While Jane was cleaning the apartment, her husband was reading a magazine.

7. Jack was painting the house when you called him yesterday morning

8. When he left me, I was talking to one of our regular costumers.

9. We were having lunch when you came to my office yesterday.

10. the students were talking when the teacher entered the room.