1) I was sitting in a cafe when you called.
2) When you arrived at the party, who was there?
3) Susie was watching a film when she heard the noise.
4) Yesterday I went to the library, next I had a swim, later I met Julie for coffee.
5) We were playing tennis when John hurt his ankle.
6) What were they doing at 10pm last night - it was really noisy?
7) He was taking a shower when the telephone rang.
8) He was in the shower when the telephone rang.
9) When I walked into the room, everyone was working.