1. Meaghan drove (drive) to Portland to find out that she had forgotten (forget) her passport.
2. He had walked (walk) the dog before he went (go) to school.
3. Had your parents already left (leave) when you came (come) home?
4. The accident had just happened (happen) when you arrived (arrive).
5. We asked (ask) her a question right after she had finished(finish) her exam.
6. They had already checke(check) in their bags before they boarded(board) the plane.