关系代词作介词宾语,即 介词+关系代词,指物只能用which
非限制定语从句中,指物只能用which,亦可指整个前面的句子.
what 一般指代主语
That引导主语从句
That they were in truth sisters was clear from the facial resemblance between them.
释义:很明显,她们确是亲姐妹,她们的脸型很相似。
How strange it is that the children are so quiet!
释义:孩子们这么安静真奇怪!
what引导主语从句
what可以在从句中充当主语和宾语:
What she did is not yet known.
释义:她干了什么尚不清楚。
What makes him disappoint isn’t clear untl now.
释义:到目前为止,什么事情(东西)使他很失望还不清楚。
which 引导主语从句,意思为哪一个,哪一些,一般后面需要紧跟名词,做具体说明是什么东西,是有范围的选择,而what是没有范围。
which one you choose is right?
释义:你选择哪一个是正确的?