1.They were playing cards when the postman came.
2.I was sweeping the floor when i heard a noise.
3.She was watching TV when the doorbell rang.
4.Susan and Sally were playing tennis when it began to rain.
5.They were had their supper when they heard about the accident.
6.When the phone rang mum was working in the garden.
7.While George repaired his bike Bill was playing computer Games.
8.We talked about the movie while we were walking home.