1. They were having tea when the doorbell rang.
2. I was sweeping the floor when I heard a noise.
3. A lot of children were waiting at the station when the star arrived.
4. He was having breakfast when the toaster blew up.
5. When I came into my office, my boss was waiting for me.
6. When we saw Brian, he was driving a taxi.
7. Father was waiting in the car while mother was doing the shopping.
8. When he arrived, we were having dinner.
9. While they were playing chess, we went shopping.
10. They were having a party while he was sleeping.
11. He took a photo when I was feeding the ducks.
12. They were playing football when the lights in the stadium went out.
13. While George and John were cleaning their room, she was doing the ironing.
14. Sam was doing the ironing when Jack phoned her.
15. We were waiting at Victoria station when the train arrived.
II.
1. They were playing cards.
2. I was sweeping the floor.
3. Sam was reading the newspaper
4. A lot of children were waiting at the station.
5. Mum was working in her office.
6. He was walking to school.
7. When they looked at her, she was smiling.
8. We were playing outside when it started to rain.
9. The boys were watching their favourite TV series.
10. I was working yesterday afternoon.
