如下,请解释一下为什么要这么写
1The Cabdian girl knows little Russian,does she?
2He has a lot of work to do, hasn't he?
3Your parents must be in the library,aren't they?
4We must study English hard or we can't be good at it,must it?
5You may use his eraser,can't you?
6Let me try it a second time,will you?
如果能总结出以上几句分别存在的客观,普遍的语法规律,额外加分呦
请大家针对以上几条逐一回答