1. i was at home when telephone rang
2.they were in the park when she saw him yesterday
3.He was so excited when he heard her voice
4.they were surprised when they opened the door
5.I was at home when it started raining
6.The telephone rang while i had my lunch
7.We wrote e-mails while we were surfing on the internet
8.he ran away while it wasn't to late
9.they had a very good time while i was shoping