问题标题：
canhavedonecouldhavedoneshouldhavedoneshouldtodoshouldn'thavedoneshouldn'ttodo还有needn'thavedoneneedn'tdomustn'thavedonemaynothavedonemightnothavedone
问题描述：
canhavedonecouldhavedoneshouldhavedoneshouldtodoshouldn'thavedoneshouldn'ttodo
还有
needn'thavedone
needn'tdo
mustn'thavedone
maynothavedone
mightnothavedone
李中凯回答：
would/could/should/needn't+havedone表示本来……实际却没有
本来想要/能够/应该/不必做某事而实际上却相反
must/may/might/can't+havedone表示对过去发生的情况进行推测
过去一定是/可能是/也许是/一定不是
shouldtodo/shouldn'ttodo不存在
这些词都是情态动词后面要么加动词原形要么加havedone
陈栋华回答：
那oughtn'ttohavedone和oughtn'ttodo呢？
李中凯回答：
oughtn'ttohavedone属于第一类oughtto是情态动词词组意义与should相同这是否定形式表示本来不应该做实际上却做了oughtn'ttodo=shouldn'tdo不应该做某事情态动词的基本用法
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