英语语法：I could have fooled you.情态动词+完成时形成虚拟语气用法,本来可以作但没做,但今天人说

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英语语法：I could have fooled you.情态动词+完成时形成虚拟语气用法,本来可以作但没做,但今天人说
I might have killed a man last night.是表猜测,奇怪了,情态动词换了个就不是虚拟了?而且last night是过去,这里该用完成时?情态动词+动词的句子有过去时和进行时吗?

你好.
1 I might have killed a man last night.是表猜测== It is possible that I killed a man last night.

2 I could have fooled you (if I had wanted to). -------这是虚拟语气,假设过去的事情.一般来说,情态动词 + 完成式 -------指代已经过去的事情.
it was possible that she was writing at that time == She might be writing at that time 情态动词+进行式.
it was possible that she was a nurse at that time == she might be a nurse at that time 情态动词+过去式------这个“过去式”体现在“情态动词”上面：may --- might

英语语法：I could have fooled you.情态动词+完成时形成虚拟语气用法,本来可以作但没做,但今天人说英语语法：You could have fooled me.情态动词虚拟语气表本来可以做（但是没做）而这句话的疑问句形式英语语法：you could have fooled me.意思是：你已经可以愚弄我了?情态动词+完成式感觉不好理解. 情态动词中 should might could would + have done 与它们在if 虚拟语气中用法有情态动词用法疑问句虚拟语气情态动词在虚拟语气中的用法, 英语语法1.could have been/would be是什么用法,都可以表示虚拟语气吗?2.the editor 情态动词(虚拟语气) 关于虚拟语气在虚拟语气的主句中,would/could/should/might这几个情态动词可以互换吗? 虚拟语气里对过去的虚拟即should\could\might+动词过去完成时和另一种虚拟语气情态动词+HAVE DONE 英语语法题求解,情态动词与虚拟语气英语虚拟语气的用法但谓语动词为instruct 等时,从句的虚拟语气的动词形式和主句的事态无关么?如：Our teach