We were playing tennis when it started to rain.

Mum was cooking dinner while Dad was watching TV.

Emma was doing homework when her mother entered the room.

Susan cut her finger while she was slicing the bread.

When I last saw Mrs. Black, she was watering the flowers.

While I was studying yesterday morning, Tom dropped by to see me.

We were swimming while David and Peter were jogging by the lake.

When they arrived at the station, it was snowing heavily.

While she was reading the newspapers, her brother was listening to music.