1.They (meet) while they (study) at university
2. I (not listen) when the teacher (explain) the problem
3.We (see) Sue when we (play) in the park
4.When I (get up) this morning it (not rain)
5.What (you/do) when I (phone)?
6.What (you/ do) last weekend?
7.I (not go) to school yesterday because I (be) sick