主语从句引导词及用法总结

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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.