№1
1.b
2.b
3.c
4.a
5.c
6.b
№2
1.had been
2.they would go
3.he liked
№3
1.she was watching TV.
2.they had cleaned the windows.
3.his mother would be 50 years old.
№4
1.to give him the key.
2.to play it again.
3.not to talk to him like that.
4.not to let him in.