1) He was reading when mother came.
2) Dad was working while mother was cooking dinner.
3) Sam and Fanny were doing yoga at this time yesterday.
4) She was going to the theatre when she met him at the bus stop.
5) What were you doing when your sister was watching the DVD?
6) Was it stormy, when you were skiing?
7) The girls were listening to when it suddenly stopped.
8) I was listening to the ballet all evening yesterday.
9) He stayed at this parking from 1 till 5 o'clock yesterday.
10) The sun was going down while we were sailing.
Ответ: смотри выше