10 I was opening the window at six o'clock yesterday.
11 Did you go to the cinema yesterday?
12 I didn't see Mike last week.
13 When I opened the door, my friends were sitting around the table.
14 When did you begin doing your homework yesterday?
15 We were discussing the last news from three till four yesterday.
16 When I read the newspaper yesterday, I found an interesting article on UFOs.
17 Did you watch TV yesterday? Yes, we were watching the whole evening yesterday.
18 When did you go to bed yesterday?
19 I was going to bed at ten o'clock yesterday.
20 At half past ten yesterday I was sleeping.
21 When I came home from school yesterday, my little brother was sitting on the floor with all his toys around him. He was playing with them. I told him to put his toys into the box as he was making too much noise.