It was uncertain whether he could come or not. 他是否会来还不肯定。
这三句句首的it均为形式主语,相应的真主语分别是that he didnt come / what she did / whether he could come or not。
二、表语从句
表语从句就是在复合句中用作表语的从句。一般说来,可用于引导主语从句的引导词也可用于引导表语从句,如that, what, who, which, when, where, how, why, whether等。如:
My idea is that we should do it right away. 我的意见是马上就干。
That is what he meant. 这就是他的意思。
The problem is how we can find him. 问题是我们如何找到他。
The morning is when Im busiest. 早上是我最忙的时候。
Thats where you are wrong. 这就是你不对的地方。
Thats why he didnt come. 这就是他没有来的缘故。
另外,表语从句还可以用as if, as though, because等来引导。如:
It is because he is too foolish. 那是因为他太蠢了。
It is not as though we were poor. 又不是我们家里穷。
三、宾语从句
1. 引导词:宾语从句就是在复合句中用作宾语的从句。一般说来,可用于引导主语从句的引导词也可用于引导宾语从句,如that, what, who, which, when, where, how, why, whether等。如:
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