I was choosing a bracelet for Mum when Mum came into the shop
Loiuse was talking to Amy when the bus arrived
When Harriet was looking for some plasters she found her watch
The team was training when Ted had an accident
When we were walking around the ruins some stones fell
The actor was performing on stage when the director started to laugh
When I was carrying some bottles the carrie bag broke.
When they were shopping it started to rain.