1 While I was walking home, I met my
friend.
2 My parents were having an argument when I
walked into the room.
3 The students were talking all the time while the teacher was explaining the exercise.
4 What were you doing when you heard
the news?
5 The students were writing an essay when the
teacher told them to stop.
6 My mum was driving when her mobile phone
started to ring.
7 The birds were singing when we left home this morning.