1.went
2.got
3.go
4,didn't go
5.met
6.didn't buy
7.left
8.do
9.began
10.was
11.wasn't
12.wore
13.were
14.go
15.was/was
16.go
17.was
18.didn't come
19.were

1: went
2: got
3: What time did you ( go)   go   to bed last night
4: hasn't gone
5: met
6: didn't buy
7: When did he ( leave)  leave  for work last week
8: When did he ( leave)  do  for work last week
9: began
10: was
11: was not
12: wore
13: were
14: Did you go
15: was
16: Where did he go
17: was
18: Why didn't you come
19: were