. They were having tea when I came home. 2. He was walking along the river when a boat was passing. 3. We listened to an interesting lecture on UFOs yesterday. 4. When I entered the classroom, the teacher was writing words on the blackboard and the pupils were coping them into their exercise-books. 5. They were getting ready to go out when it began raining. 6. Yesterday at one o’clock I had lunch. 7. When he came in, I was doing my exercises. 8. What were you doing at eight o’clock yesterday? 9. At this time yesterday I was riding home by my bicycle. 10. You were sleeping when I went out. 11. I was walking along the street with my friend when a tram was passing. 12. We were discussing our plans for the weekend when Nick rushed into the room. 13. I was coping files from my flesh-card when suddenly the computer hung. 14. Yesterday my sister celebrated her birthday. The telephone rang the whole day. 15. The doctor examined the patient the whole week but did not find the cause of his pains.
