may have been和may be怎么翻译

may have been和may be有什么区别? may have been怎么用 might be和 may have been的区别?还有是might do和 may have done He may have been busy和He might be busy 请问May be 和May have been 的区别,它们分别在什么时候用? may have been 和may have done的区别,特别是may have been doing和may h 在英语里coms been、must been和may been和come have been、must have be could have been 和may have been 有什么区别? may not have been...与 may have not been ... A.must be B.may have been C.can have been D.could be ,为什么呢, She may well be late.怎么翻译 there may be instances when . 怎么翻译?