1. Peters was playing a video game when his brother, Jack entered the room. 

2. I was studying for my English test when my mother came home from work. 

3. Emma was washing the dishes when the telephone rang. 

4. I was eating a sandwich while my parents were drinking coffee. 

5. I was watching a DVD when my cat jumped on me. 

6. I didn't hear the thunder during the storm last night because I was sleeping. 

7. It was beautiful yesterday when we went for a walk in the park. The sun was shining. The birds were singing. 

8. My brother and sister were talking about something when I walked into the room. 

9. Tom went to his friend's house, but the boys weren't there. They were playing soccer in the vacant lot down the street. 

10. The little boy fell asleep while his mother was reading him a story. 

11. I really enjoyed my holiday last January. While it was snowing in Iowa, the sun was shining in Florida. 

12. It was snowing when I left home this morning. 

13. It was a sunny afternoon and people were sitting on the grass in the park. Then suddenly it started to rain. 

14. My brother was talking on the phone when I arrived, but when he saw me, he finished the call. Perhaps he thought that I was listening to his conversation. 

15. We were climbing the wall when the gardener saw us. 

16. Susan was playing the piano while Mary was singing. 

17. Were you listening to the teacher when she was explaining this exercise? 

18. Linda was having a beautiful dream when the alarm clock rang.