详解shall与should的用法区别.

详解shall与should的用法区别. shall用法 和should的区别 shall与should的区别? would do的用法详解,would do与should do的用法区别? shall /should的区别 shall should 的区别 shall should may might can could must虚拟语气的用法与区别比较讲一讲用法吧, shall与will的用法区别 shall work与shall be working的区别和用法 should和shall用法有什么区别 should与shall的使用上的区别是什么? should和could的用法与区别? should 和could的用法与区别 shall 做情态动词的用法详解 shall we和will you 的用法与区别 Will would; shall should ;can could区别和用法 should 与must用法区别 是What should i buy 还是What shall i buy?同上请阐述理由。顺便说说 should 和 shall的区别和用法