must提问,否定回答问什么不能用no,you mustn't?而用may提问,否定则用no,you mustn't.mustn't 和can't有什么区别?

问题描述:

must提问,否定回答问什么不能用no,you mustn't?
而用may提问,否定则用no,you mustn't.mustn't 和can't有什么区别?