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

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shall和will;should和wouldshallhavebeenwillhavebeenshouldhavebeenwouldhanebeen它们分别要在什么样的情况下用哪个啊?shall和w

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