could have done couldn't have done might have do
could have done
couldn't have done
might have done
should have done
needn't have done.区别这几个？
couldn't have done：不能做
might have done：可以做
mightn not have done：不可以做
should have done：应该做
shouldn't have done：不应该做
need have done：需要做
needn't have done：不需要做
~_~
区别可以分出来吗？给你补了几个，希望可以采纳，谢谢！
could have done couldn't have done might have do
could have done：能做 couldn't have done：不能做 might have done：可以做 mightn not have done：不可以做 should have done：应该做 shouldn't have done：不应该做 need have done：需要做 needn't have done：不需要做 ~_~区别可以分出来吗？给你补了几个，希望可以采纳，谢谢！
could have done 和 might have done 的区别
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can't have done和couldn‘t have done 的区别
can't have done(不可能做过)是must have done(一定做过)的否定形式。 couldn't have done(可能没做过)是may have done(有可能做过)的否定形式。 一般认为can't have done有80%以上的把握.而couldn't have done则委婉的多,只有50%左右的把握. must do \/can't do一定,肯定80%把握。 may\/could do\/c...
can't have done和couldn't have done的区别?
can't have done：词性为短语，can't（can not）：不能；have：已经（助动词）；done（do的过去分词）：做过 couldn't have done：词性为短语，couldn't（could not）：不能；have：已经（助动词）；done（do的过去分词）：做过 通过下面的表格我们了解下can't have done和couldn't have done...
couldn't have done什么意思?
couldn't have done(可能没做过)是may have done(有可能做过)的否定形式。一般认为can't have done有80%以上的把握.而couldn't have done则委婉的多,只有50%左右的把握.must do \/can't do一定,肯定80%把握。may\/could do\/couldn't do有可能50%把握。might do\/mightn't do也许大概差不多30...
can have done和could have done有无区别?can't have done和couldn't...
1、can have done 和could have done 的区别 can have done是表示应该做某事而没有做,所以既然知道没有做,那肯定是已经发生了。could have done 表示本能做而实际未做,是虚拟语气.2、can't have done和couldn't have done的区别 can't have done（不可能做过）是must have done（一定做过）的...
can't have done和couldn‘t have done 的区别
done和can't have done都表示不可能,是对过去情况的推测。例句:he can't \/ couldn't have worked out the problem.他不可能解决了这个难题。can't 也可以用于对现在情况推测，couldn't have done可以用 和过去事实相反的虚拟语气。例如：if you hadn't gone to the party,you couldn't have m...
虚拟语气could\/should\/would\/might +have done 用法的差别?麻烦解答一...
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could have done 与might have dore的区别
如果使用might，语气就比较婉转或更加不肯定，如：Mary might have learned some Chinese before. ②可以表示过去本来可以做到而实际没有做到的事情，有“劝告”或“责备”的语气，如：You didn't do the work well that day. You might have done it better. (3)must后接完成式的用法：表示对过去...
