I don t think he could have done so much homework last night,did he?表推测的反意疑问句的问题..1.I don t think he could have done so much homework last night,did he?2.I don t think he could have done so much homework,has he?我知道第一

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I don t think he could have done so much homework last night,did he?表推测的反意疑问句的问题..1.I don t think he could have done so much homework last night,did he?2.I don t think he could have done so much homework,has he?我知道第一
I don t think he could have done so much homework last night,did he?表推测的反意疑问句的问题..
1.I don t think he could have done so much homework last night,did he?
2.I don t think he could have done so much homework,has he?
我知道第一句表示对过去事实的否定推测,所以用过去时,但是为什么第二句把last night去掉后就变成用has he了?

I don t think he could have done so much homework last night,did he?表推测的反意疑问句的问题..1.I don t think he could have done so much homework last night,did he?2.I don t think he could have done so much homework,has he?我知道第一
情态动词+have 过去分词 都表示对过去的事实进行推测,与表示过去时间的状语连用时,相当于一般过去时.如：You must have stayed very late last night,didn't you?
但是,不与过去时间连用时,则指过去的动作对现在产生影响,相当于现在完成时.如：
You must have seen the film Titannic,haven't you?你肯定看过电影泰坦尼克了,不是吗?(那我就不邀你去看了）

过去完成时

有明确时间的用过去时，没有明确时间，但已完成了，用过去完成时。

如果有明确的表示过去的时间状语，就按过去时理解，所以did he；否则按照完成时理解

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