could have done 的意思有的书说意思是"过去可能做过某事"但有的书却说是"本来可以做某事(而实际上没做)"究竟谁对呢?

shouldn't have done couldn'd have done should have done could have done 他们的意思到底 实际有没有做就是比如说第一个的意思 到底实际上有没有做很纠结啊 would have done,might have done,could have done,should have done分别表示什么意思? couldn't have done与couldn't区别以及当could have done表示对过去的猜测时,could have done与could有什么区别? 情态动词加上完成时的意思?could not have done must not have done should not have done would not have done 以及它们的用法? 情态动词+have done 如 could have done,must have done,should have done 等等在如他么的否定词表示什么意思? need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明, I thought I could have done it 和 I thought I could do 有什么区别?知道could have done 是虚拟语气,但我觉得这2句话意思是一样的啊. 有没有can have done sth?could have done sth有两种意思吗?can't/couldn't have done sth意思又是什么能不能举几个例子? could have done和would have done的区别 should have done和could have done的区别? could have done 和 might have done 的区别 求情态动词＋have done中 Should、need、 could的意思是“本…?”有什么区别同题 should have done ;could have done; might have done 有什么区别 could have done 和 can have done 有什么区别?还有would have done can have done和 could have done有什么区别?那can have done什么用法？ 求could 、should have done的用法. could/should/mind have done sth.的区别could have done sth.should have done sth.mind have done sth.告诉我三者之间意思以及用法的区别! could never have done