6.1)wasn’t going
2) hasn’t been going
3) hadn’t gone
4) hadn’t been going
7.1)checked we in
2) have we checked in
3) had we checked in
4) we were checking in
8. 1) left
2) was leaving
3) had left
4) has left
9.1) would begin
2) had begun
3) was begun
4) was beginning
10. 1) would go
2) went
3) had gone
4) was going
