while we were shopping ,our friends came to us
My mom was tidying my room when she found your letter.
when the teacher came in ,he was reading a comic book.
I heard a strange noise as I was watching television.
someone called her up while she was talking to her friend.
I was feeding my goldfish when one jumped out of the tank.
he entered the room while i was looking for a pen.
where were you going when I passed you yesterday evening?
How many people were queuing behind you when the concert began?