1.You were sleeping when I came home.
2.He was readung on the sofa when I entered the room.
3. I was walking along the street with my friend when a tram passed.
4. She was looking out the window when I saw her.
5.We were answering the teacher's questions when the head teacher entered the classroom.
6.They were drinking tea when I returned home.
7. He was walking along the river when it started raining.
8. The old man was thinking adout his plan when the phone rang.
9.We listened to an interesting lecture yesterday.
10.When I entered the classroom, the teacher was writing some words on the board and the pupils were copying them into their exercise books.
