1:If that movie looked interesting, I'd go see him.
2:What would you do if you lost the train?
3:Of course if I had lost the train I should have taken the bus.
4:He will go to school as soon as he finishes his homework, does not he?
5:They will not go skiing unless they're snowing, do they?
6:It's possible he did not understand the problem, and that's why he got a bad note, did not he?
7:I'm sure he'll solve the problem if you explain them, do not you?
8:He probably lost the keys and that's why he did not come to school until now, did he?