摘要：引导词：主语从句引导词有that、whether、whom、whose、who、whoever、what、whatever、which、whichever等。用法：主语从句是在复合句中充当主语的从句...
引导词：主语从句引导词有that、whether、whom、whose、who、whoever、what、whatever、which、whichever等。用法：主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
主语从句引导词
从属连词：that，whether。
连接代词：whom，whose，who，whoever，what，whatever，which，whichever。
连接副词：why，when，whenever，where，wherever，how，however。
1、that引导。
例句：That you are coming to London is the best news I have heard this long time.你将来伦敦是好久以来我听到的最好消息。
引导主语从句的连词that有时可省，有时不能省，其原则是：若that引导的主语从句直接位于句首，则that不能省略;若that引导的主语从句位于句末，而在句首使用了形式主语it，则that可以省略。
例句：That you didn’t go to the talk was a pity.很遗憾你没去听报告。
2、whether引导。
例句：Whether they would come is still a question.他们会不会来还是一个问题。
3、连接代词引导。
例句：Whoever get the gold apple can be blessed by God.拿到这个金苹果的人，不管是谁，都会被神祝福。
4、连接副词引导。
例句：How this happended is now investigated by police.警察正在调查这件事是怎么发生的。
5、关系代词型what引导。
例句：What shocked me was that all of these children had no parents.我很震惊的是这些孩子都没有父母。
主语从句用法
主语从句是在复合句中充当主语的从句，通常放在主句谓语动词之前或由形式主语it代替，而本身放在句子末尾。
1、It 作形式主语和it引导强调句的比较
①主语从句常用it作形式主语，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句
例如：
It is still a question whether she will come or not.
It is strange that you should like him.
It is still unknown which team will win the match.
另外，还有一些比较多见的结构：
It turned out that……;
It has been proved that……;
It happened/occurred that……;
It is well-known that……等等
②而强调句则不同，它的结构是：It+be+被强调部分+that+从句
强调主语：It is the times that produce their heroes.时势造英雄
强调宾语：It is English that Prof.Lin teaches us.
强调状语：It was in shanghai that I saw the film.
判断是否是强调句有一个方法，就是将that以后的“句子的其余部分”拿出来单独看，看有没有缺成分，缺的是什么成分，再把谓语动词后面that前面的那部分，带到你认为缺成分的地方，如果放进去是一句完整的句子了，那就说明是强调句。
2、用it 作形式主语的结构
(1) It is +名词+that从句
It is a fact that … 事实是……
It is an honor that …非常荣幸
It is common knowledge that …是常识
(2) it is +形容词+that从句
It is natural that… 很自然……
It is strange that… 奇怪的是……
(3) it +不及物动词+that从句
It seems that… 似乎……
It happened that… 碰巧……
(4) it is+过去分词+that从句
It is reported that… 据报道……
It has been proved that… 已证实……
(4) 含主语从句的复合句是疑问句时，主语从句不可提前。例如：
Is it likely that it will rain in the evening?
4、What 与that 在引导主语从句时的区别What 引导主语从句时在从句中充当句子成分，如主语.宾语.表语，而that 则不然。
例如：What you said yesterday is right.
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