shall和will;should和would

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/12 11:41:21

shall和will;should和would
shall have been
will have been
should have been
would hane been
它们分别要在什么样的情况下用哪个啊？

shall have done
将来完成进行时,表示在将来某一时间以前已经完成或一直持续的动作.经常与before+将来时间或by+将来时间连用,也可与before或by the time引导的现在时的从句连用.
will have done
表示从将来的某一时间开始、延续到另一个将来时间的动作或状态,或是发生在某个将来时间,但对其后的另一个将来时间有影响的动作或状态.
should have been 表本应该做而没做的事
would have been 表示过去本来要做某事却因某种原因没做成

shall和will;should和would will和would,shall和should的关系 would 和should; shall和will 怎么区别运用, Will would; shall should ;can could区别和用法他们的区别:shall (should),will (would) 关于shall,will,would,should的问题! 用shall,should,will,would填空 be,have,do,shall,will,should,would must,can,may ,should,would,need和shall的区别情态动词can、could；shall、should；will、would的区别 will would ; shall should ; can could ; must need ; may migh shall 和should的区别