第1个回答 2012-02-22
That引导主语从句
如:That they were in truth sisters was clear from the facial resemblance between them.很明显,她们确是亲姐妹,她们的脸型很相似。
有时that可以放在句首,但当that引导的主语从句出现在疑问句中时,要以it作形式主语,而把主语从句后置。如:Is it true that the scientist will give us a lecture next week?
当主语从句出现在感叹句中时,要以it作形式主语,而把主语从句后置。如:
How strange it is that the children are so quiet! 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:例如What she did is not yet known. 她干了什么尚不清楚。
What makes him disappoint isn’t clear untl now.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,是又范围的选择,而what是没有范围。例如which one you choose is right.