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       考研英语复习中，离不开要涉及到拾起英语语法知识。那么我们怎样做，才能做到事倍功半呢?这里，小编建议考生紧扣《考研英语大纲》，提炼重点，从基础部分突破。只有目的明确才能让英语备考不偏离方向。下面是为2020考研者，整理了考研英语重点语法知识:主语从句，供考生参考。

2020考研英语重点语法知识:主语从句

一、定义

主语从句是指在复合句中做主句的主语的从句。

二、表现形式

A.由从属连词(that,whether/if)引导

That the plates are moving is beyond dispute.

板块在运动，这是无可质疑的。

【提示】不能这样表达：The plates are moving is beyond dispute。尽管that并没有实际含义，但是它起到引导从句的功能，在这里不可或缺，否则句子结构会出现混乱。

That our environment has little,if anything,to do with our abilities,characteristics and behavior is central to this theory.

这种理论的核心是，我们的环境同我们的才能、性格特征和行为即使有什么关系的话，也是微不足道的。

B.由连接代词引导

Who will go to the energy conference is not important.(疑问分句用作主语)

谁将去参加能源会议并不重要。

What he wanted to see was an end to all the armies of the world.

他想看到的是世界上一切军队的消亡。

(2001,text 2)What was less visible then,however,were the new,positive forces that work against the digital divide.

C.由连接副词引导

How he manages to finish the job is of interest to us all.

他是如何设法完成这项工作的，我们对此都很感兴趣。

D.用it作形式主语

由于主语从句位于句首会使句子显得头重脚轻，因此常把它移至句子后部，句首用引导词it来作形式主语。

It is our hope that the two sides will work towards peace.

我们希望双方朝着和平的方向努力。

【提示】习惯上不能说There is our hope that the two sides will work towards peace。

It doesn’t matter whether Mary comes to the party or not.

玛丽是否来参加聚会没有多大关系。

E.两个从句共同做主语

(2005,text 1)Whether such a sense of fairness evolved independently in capuchins and humans,or whether it stems from the common ancestor that the species had 35 million years ago,is,as yet,an unanswered question.

(1993,74)It is imagined by many that the operations of the common mind can be by no means compared with those of the scientists’minds,and that they have to be acquired by a sort of special training.

       以上是北京文都考研网给出的“2020考研英语重点语法知识:主语从句”，希望对考生在公共课英语的复习上面有所帮助!祝2020考研顺利!

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