have been do和have been doing的不同

might be和 may have been的区别?还有是might do和 may have done have been do和have been doing的不同 have been done和have been do的区别 have been done 和 to be done have been=be Do not be afraid,we have been here accompany you! have been和be been是一个意思吗? 请问they have been able to do的时态是什么?been able to 和 be able to的区别是什么? have since been 和 have been since have been 和have ever been区别! have been needing to do 存在have been doing、have being doing、和have be doing吗? also would be,would also be和would be also有什么区别?类似的还有“always have been”,have always been以及have been always. have been + 形容词 和be+形容词 有什么区别? may have been和may be怎么翻译 have been done和be done的区别 must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be Have been Be请问She may be swedish .和 She may have been swedish.的区别.have been什么意义?谢谢.