5 предложений о каком нибудь действии в прошлом которое произошло раньше другого действия в прошлом

1. The train had left before I came to the station. 2. I closed the door and inderstood that I had forgotten my keys. 3. We came to buy that book, but somebody had bought it five minutes before. 4. two of the students were late - the lesson had already started. 5. I called Jane to tell her that amazing story, but Sarah had already told her everything.