在英语里coms been、must been和may been和come have been、must have be

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在英语里coms been、must been和may been和come have been、must have been和
may have been的区别?请举例!哪些词是宾语、定语、介词,请举例!
coms应该是comes

你说的应该是can/could be、must be、may/might have been、must have been
can/could be：表猜测,可能
must be:一定
may/might be：可能,语气比can/could弱
must have been:一定做过,表动作已发生
may/might have been:可能做过,表动作已发生

在英语里coms been、must been和may been和come have been、must have be must be和must have been有什么区别 can't have been和must have been must have been done/must be done 关于must have been MUST have been done must have been A.must be B.may have been C.can have been D.could be ,为什么呢, must be和must have been 在句子中作什么成份及其时态? 选词填空（can't have been\must be\must have been\can't be \may ha i think he must have been a mechanic,中的must和have been是什么词啊? must have/ must have been的区别