1)When my father CAME home,I WAS HAVING dinner.
2)When Alice RETURNED,I WAS LISTENING to the radio
3)When mother ENTER HER room,she WAS DRAWING a picture
И т.д
Крч,когда видишь WHEN,то после него употребляешь PAST SIMPLE,а остальная часть предложения будет в PAST Continuos(cont.)
7)(1 часть предложения ,WHEN нету,значит употребляем PAST CONT.)He WAS WASHING his face
(2 часть,есть WHEN,это PAST SIMPLE)
When somebody knocked at the door.