1
1 since
2 for
3 since
4 for
5 since
2
1 lived
2 worked
3 had
4 haven't seen
5 known
3
1 How long have they been in class?
2 How long has he known John?
3 How long has Mary worked in Miami?
4 How long have Pat and Ray been married?
5 How long has my mother had a motorbike?
6 How long have they studied Chinese?