1) After I had finished the test I left the classroom
2)We were tired because we had written two compositions
3) By the time they film started we had eaten all the popcorn
by the time the film started we had eaten all the popcorn
4) The kids hadn’t gone to sleep until their dad came home
5) when the fire brigade arrived we had put out the fire
6)After he had had a serious car crash he went to hospital