含I don't know 的几个宾语从句问题

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含I don't know 的几个宾语从句问题
I don't know ___.
答案是where my class teacher lives now
为什么不能是where my class teacher is living now
I don't know ___.
答案是how well I did in the exam
为什么不能是if I had passed the exam
这个我有猜测下……因为没有时间点所以不需要用过去完成时?就是说如果是if I passed the exam就可以么?

1.主语时态是一般现在时,所以从句也是一般现在时而不用现在进行时.
2.if I passed the exam可以.你说得对,过去完成时要有明显的表示过去的时间点或段.一般很少直接用的.

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