Поставьте глаголы в past indefinite, present perfect либо past continuous.1. When

Поставьте глаголы в past indefinite, present perfect либо past continuous.
1. When the coach (to return ) the students (to do) the forth exercise.
2. The students (to do) all the exercises before the coach (to return).
3. We (to discuss) two important questions at the last meeting/
4. The runner already (to set) a new record before his friend came to the contest.
5. We (to discuss) all the problems by 5 oclock in the evening.
6. When you phoned, the students (to do) morning exercise