1) did you see him
2) were playing, were watching
3) happened
4) came back, called
5) were you doing
6) left the office
7) knocked the door, sat
8) was born
9) borrowed
10) was reading, was sitting, watching
11) I was late
12) did you meet
13) was sleeping
14) I couldn't visit
15) I didn't like
16) did you leave the room
17) was sleeping
18) was
19) We had a good
20) was joking
