主语从句讲解

初中语法主语从句讲解及主语从句：即在复杂句中充当主语成分的句子例如"That XXX"，他在很短的时间内写完作文让我们都很惊讶,此复合句主要描述的是某事让我们惊讶，某事就是该复合句的主语，因此"That XXX"便是该复合句的主语从句。

主语从句使用陈述语序，其通常结构为“引导词+主语+谓语+其他成分”；但当连接代词同时充当从句主语时，其结构为“连接代词+谓语+其他成分”。

时态：主语从句的时态不受主句时态的影响和限制引导主语从句的连词主要有:从属连词:that、whether（只起连接作用，不充当句子成分）连接代词:who、whoever、whom、whose、what、whatever、which、whichever（既有连接作用，又做从句的主语、宾语、表语或定语）连接副词:when、where、how、XXX、wherever（既有连接作用，又做从句的状语）例句：1.that指导例句：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。

2.whether指导例句：Whether they would support us was a problem.他们是否会支持我们还是一个问题。

3.连接代词引导例句：XXX is top from wins the game when two matched players meet.两强相争勇者胜。

4.毗连副词指导例句：How this happended is not clear to anyone.这件事怎样发生的，谁也不清楚。

5.what引导例句：What struck me was that they have all suffered a lot.给我很深印象的是他们都受过很多苦。

名词性从句之主语从句一、名词性从句概述：在句子中起名词作用的各种从句统称为名词性从句。

根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。

二、主语从句定义：在句中起主语作用的从句称为主语从句。

引导主语从句的连接词主要有：单纯连词(that, whether/ if)、连接代词(what, whatever, who, whoever, whom, whose, which, whichever 等)和连接副词(when, where, why, how, whenever, wherever, however 等)。

1)that引导的主语从句(1)由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。

例如：That you will win the medal seems unlikely.你能得奖看起来不大可能。

That light travels in straight lines is known to all.众所周知，光沿直线传播。

That you don’t like him is none of my business.你不喜欢他不管我的事。

(2)形式主语it替代主语从句位于句首，that引导真正的主语从句会放到句子的后面。

常用的句式主要有如下几种：1.It+系动词+形容词+that从句。

如：It is necessary that … 有必要 .....It is clear that … 很清楚.....It is likely that … 很可能.....It is important that … 重要的是.....类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc.例如：It was really astonishing that he refused to talk to you.It is essential that he should be here by the weekend.It seems obvious that we can not go on like this.It is necessary that you (should)master the computer.It is important that a student learn English well.It' s clear that they badly need help.It is likely that a hurricane will arrive soon.知识拓展：在“It is necessary / important/surprising/strange/unthinkable/unbelievable/incredible+that 从句”这类主语从句结构中，从句中谓语动词常用(should) +动词原形”，形式，即要用虚拟语气should 可省略。

主语从句讲解及练习什么是主语从句？主语从句是由一个从句充当主语的句子结构，它由连接词引导，用来说明主语的内容或者起到引入主题的作用。

主语从句的引导词一般情况下，主语从句由以下连接词引导：- that- whether/if- who/whom- which- what- whatever- whoever- whichever主语从句的用法主语从句在句子中承担主语的角色，可以帮助我们表达某个动作、状态、事件或者事实的主题。

下面是一些常见的用法示例：1. 表达事实或真理：例如：That he is innocent is beyond doubt.（他的无辜是毫无疑问的。

）2. 表达感觉或观点：例如：What he said is very interesting.（他说的话很有趣。

）3. 引导宾语从句：例如：I believe that he will succeed.（我相信他会成功。

）主语从句的位置一般情况下，主语从句位于句首或者句中，具体位置取决于句子的结构和语境。

主语从句的练题请根据下面的句子，填写合适的主语从句：1. __________ you did yesterday surprised everyone.（你昨天做的事让大家都吃惊。

）2. __________ will happen remains unknown.（将会发生什么还不确定。

）3. __________ is important to study hard.（努力研究是很重要的。

）5. __________ we need is more time.（我们所需要的是更多的时间。

）参考答案：1. What2. What3. It4. Whether/if5. What以上是对主语从句的讲解及练习，希望对你的学习有所帮助。

主语从句1．定义：用作主语的从句叫做主语从句。

2．引导主语从句的关联词有三类：（1）从属连词that、whether。

如：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.Whether he’ll come here isn’t clear。

他是否会来这里还不清楚。

从属连词：that， whether等.that 引导主语从句只起引导作用,本身无实际意义，在主语从句中不充当任何成分，但不能省略.由whether及其他连词引导的主语从句放在句首，句后都可. If只能放在句中.造句:1。

、很明显他是个好人.2。

、他通过了考试让妈妈很高兴。

3、天气是否会转晴还不确定。

(3）（特殊疑问词）连接代词who, whom， whose， what, which, whoever， whatever, whichever 如：__________watch was lost is unknown.__________she did is not yet known. 她干了什么尚不清楚.__________side will win is not clear。

__________comes is welcome。

不论谁来都欢迎。

__________ was said has left us much to think。

这里说的话都应当保密.造句：1. 我们需要的是时间。

2。

谁将成为我们的班长还没有决定。

3。

哪本书更好还不知道。

(4) （特殊疑问词）连接副词 where, when, how， why，wherever，whenever，however。

___________ he did it remains a mystery.When they will start is not known yet.How this happened is not clear to anyone。

主语从句讲解• 主语从句• 一、主语从句的引导词• 主语从句通常由连词that和whether/if、连接代词或连接副词引导。

• 1. that引导• 2. whether引导• 3. 连接代词引导• 4. 连接副词引导• 5. what引导• 1. that引导• That he is still alive is a wonder. • 他还活着，真是奇迹。

• That we shall be late is certain. • 我们要晚了，这是确定无疑的。

• That he should have ignored the working class was natural.• 他忽视工人阶级是很自然的。

• That she is still alive is a consolation.1• 她还活着是使人感到宽慰的。

• That she became an artist may have been due to her father’s influence.• 她成为画家可能是受她父亲的影响。

• That you are co ming 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。

• That she was chosen made a tremendous stir in her village. • 她被挑选上，在她村子里引起很大轰动。

• Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。

• Whether they would support us was a problem. • 他们是否会支持我们还是一个问题。

• 3. 连接代词引导• who will give us a talk is unknown at all . • Whichever (of you) comes in first will receive a prize.无论(你们)谁先到都可以得奖。

2023年高中英语语法精讲之主语从句详细讲解主语从句结构及用法在句子中担当主语的从句就叫做主语从句，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。

通常结构为“引导词 + 主语 + 谓语 + 其他成分"。

一. 概念：在句子中担当主语的从句就叫做主语从句，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。

主语从句使用陈述语序，其通常结构为“引导词 + 主语 + 谓语+ 其他成分", 但当连接代词同时充当从句主语时，其结构为“连接代词 + 谓语 + 其他成分”。

二. 引导词：1. that引导eg. That you are coming to London is the best news I have heard this long time.2. whether引导eg. Whether they would come to conference was a question.3. 连接代词引导: who,whom, whose, what, which, whoever, whomever, whichever, whatevereg. Whoever is top from wins the game when two matched players meet.4. 连接副词引导: therefore, besides, otherwise, however, moreover, still, thus, meanwhileeg. How this happended is not clear to anyone.5. 关系代词型what引导三. 形式主语it:1. 对关系代词型what引导的主语从句，可以使用形式主语。

eg. It is clear enough what he meant.2. 如果句子是疑问句，则必须用带形式主语it的结构.eg. Is it true that all of us need to to conference?主语从句有哪几类如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句。

一、主语从句的引导词主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导。

1. that引导That he is still alive is a wonder. 他还活着，真是奇迹。

That we shall be late is certain. 我们要晚了，这是确定无疑的。

That he should have ignored the working class was natural. 他忽视工人阶级是很自然的。

That she is still alive is a consolation. 她还活着是使人感到宽慰的。

That she became an artist may have been due to her father’s influence. 她成为画家可能是受她父亲的影响。

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。

That she was chosen made a tremendous stir in her village. 她被挑选上，在她村子里引起很大轰动。

2. whether引导Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。

Whether they would support us was a problem. 他们是否会支持我们还是一个问题。

3. 连接代词引导Whoever is top from wins the game when two matched players meet. 两强相争勇者胜。

Whichever (of you) comes in first will receive a prize. 无论(你们)谁先到都可以得奖。

初中主语从句讲解主语从句是指在一个句子中，作为主语的从句。

研究主语从句可以帮助我们丰富句子结构，使句子表达更准确、更丰满。

以下是初中主语从句的讲解：1. 主语从句的构成主语从句由一个从句充当主语，在句子中承担主语的功能。

从句通常以连词引导，如：that, whether, if, who, which, what, when, where, why等。

2. 主语从句的位置主语从句通常位于句首或句尾。

位于句首时，需用逗号与主句隔开；位于句尾时，与主句之间无需逗号分隔。

示例：- That she is my best friend is known to everyone.（以从句开头）- It is known to everyone that she is my best friend.（以从句结尾）3. 主语从句的时态和语序主语从句的时态和语序要与主句保持一致。

如果主句是现在时，从句通常也是现在时；如果主句是过去时，从句通常也是过去时。

示例：- She said that she is going to the park.（现在时）- She said that she would go to the park.（过去时）4. 引导主语从句的连词常用的引导主语从句的连词有：that, whether, if, who, which, what, when, where, why等。

不同的连词对应不同的情境。

示例：- It is important that we study hard.（that引导，表示重要性）5. 主语从句的变换主语从句可根据需要进行变换，如将陈述句变为疑问句、将陈述句变为感叹句等。

示例：- He knows where the library is. → Where is the library?（变为疑问句）- It's strange that he hasn't arrived yet. → How strange it is that he hasn't arrived yet!（变为感叹句）以上是初中主语从句的讲解。