名词性从句之主语从句讲解
主语从句讲解及习题
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。
高考英语主语从句讲解
高考英语主语从句定义：用作主语的从句叫主语从句，它是名词性从句之一。
主语从句的时态：不受主句的时态影响和限制。
引导主语从句的连接词有：从属连词: that, whether；连接代词: who (whoever), whom, whose, what (whatever)和which (whichever)；连接副词: when, where, how和why。
连接词：1. 从属连词：that，whether1）that引导主语从句只起引导作用，在主语从句中不充当任何成分，that本身无实际意义，但不能省略。
2）whether意为“是否”，放在句首句末皆可。
由whether引导的名词从句做主语，表语，介词宾语，同位语时！不可用if代替。
a.That price will go up is certain.b. Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
2. 连接代词who ，what ，which, whatever, whichever, whoever (Who, whom, which, what可以和ever构成合成词，和what一样引导从句，ever起到强调作用。
此类主语从句不能用形式主语it引导，它们在句子中担任成分，不能省略，语序为陈述语序，既有疑问含义,又起连接作用,同时在从句中充当各种成分。
Which side will win is not clear. Whoever breaks the law will be punished.Whatever he did is right. Who killed the scientist remains a question.1）What和that引导的主语从句的区别：that 只起引导作用，不充当任何成分，没有意思。
What 不仅起引导作用，还要充当一定成分(主语、宾语或表语)，意思是：“什么”。
名词性从句与主语从句
名词性从句与主语从句在英语语法中，名词性从句和主语从句是重要的从句类型。
它们都属于从属从句，扮演着整个句子的一个成分。
本文将详细介绍名词性从句和主语从句的定义、特点和用法，并举例说明其在实际应用中的运用。
一、名词性从句的定义和特点1. 定义：名词性从句是指在复合句中充当名词成分的从句。
它可以充当主语、宾语、表语和同位语等。
2. 特点：a. 通常由连词that, whether/if, who, whom, which, what, when, where, why, how等引导；b. 在从句中担任名词的职能，整个从句作为整体在句中起到名词的作用；c. 可以替换为一个单词或短语，使句子更加简洁明了；d. 名词性从句的引导词根据从句所充当的成分来选择。
二、名词性从句的用法名词性从句的常见用法包括主语从句、宾语从句、表语从句和同位语从句。
下面将分别进行讲解。
1. 主语从句主语从句在句子中充当主语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
例如： - Whether we can finish the project on time is still uncertain.- That he stole the money is beyond doubt.- How to solve this problem remains a challenge.2. 宾语从句宾语从句在句子中充当宾语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
例如： - She asked me where I had been all day.- I don't know if he will come to the party.- We should consider whether this plan is feasible.3. 表语从句表语从句在句子中充当表语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
第05讲 名词性从句之主语从句(解析版)【暑假自学课】2023年新高二英语
第05讲名词性从句之主语从句1．了解主语从句的概念和用法。
2．可以根据本节课的内容来完成一些习题。
关于各种从句，有一个浅显易懂的规律：它在句子里面是什么成分，就是什么从句。
比如：▼ 定语从句：作定语的从句I have a dog that is very cute. 我有一只可爱的狗主语谓语宾语定语从句（句中做定语，限定修饰前面的名词dog）▼ 宾语从句：作宾语的从句，放在动词或介词后面I think the dog is very cute.我觉得这个狗很可爱主语谓语宾语从句（句中做think的宾语）▼ 状语从句：作状语的从句I bought a dog because it’s very cute. 我买了一只狗，因为它很可爱主语谓语宾语状语语从句（句中做状语，表原因）那么，主语从句是？聪明的人都能看出来——作主语的呗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：引导主语从句的词有连词：that, whether, if；连接代词：what, whatever, who, whoever, whom, whomever, whose, which, whichever；连接副词：when, whenever, where, wherever, how, however, why。
答案第1页，共15页1. 连词that, whether, if引导的主语从句that在主语从句中不作成分，没有意思，不能省略；whether和if虽不作句子的成分，但有“是否”的意思，且if引导的主语从句不能位于句首。
名词性从句-主语从句
主语从句的构成
主语从句的构成包括引导词和陈述句两部分。引导词是主语从句的开头，陈述句则是主语从句的具体 内容。
例如：“That he will come is certain.”这个句子中，“that”是引导词，“he will come”是陈述 句，合起来构成了主语从句“that he will come”。
特殊情况下的语序变化
在某些特殊情况下，如强调或倒装句中，主语从句的语 序可能会发生变化。例如，“It is he who is responsible for the accident.”（是他负责这起事故。）
主语从句的省略
省略条件
主语从句在某些情况下可以省略，通常是在从句内容与主句内容重复或从句内容不重要的情况下。
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名词性从句-主语从 句
目录
• 主语从句的定义 • 主语从句的引导词 • 主语从句的句型结构 • 主语从句的用法 • 主语从句的注意事项
01
主语从句的定义
什么是主语从句
主语从句是名词性从句的一种，在句子中充当主语成分，表示句子中的主要内容。 主语从句通常由一个连词引导，如that、whether等，后面跟随一个完整的句子。
引导词who
总结词
表示人或身份
详细描述
who作为主语从句的引导词，通常表示人或身份，在句子中起到连接主语和谓语的作用。例如，“Who will win the game is still unknown.”（谁将赢得比赛仍然未知。）
引导词which
总结词
表示选择或范围
详细描述
which作为主语从句的引导词，通常表示选择或范围，在句子中起到连接主语和 谓语的作用。例如，“Which team will win the game is still unknown.” （哪个队将赢得比赛仍然未知。）
高中英语2024届高考名词性从句知识分类讲解(主语从句+宾语从句+表语从句+同位语从句)
高考英语名词性从句知识讲解名词性从句是指在复合句中起名词作用的句子，功能相当于名词词组。
名词性从句在复合句中能作主语、宾语、表语、同位语等，根据在句中的语法功能可分为主语从句、宾语从句、表语从句和同位语从句。
一、主语从句【定义】在复合句中，作主语的句子称为主语从句。
常见的连接词：（连接词在句中不能省略）that, whether, who, what, whatever, whoever, where, when, why, how等。
【用法】1.连接词 that 引导That we should learn English well is very important.主语从句中 we should learn English well句子完整，不缺成分，用that引导，that 不能省连接词whether，if 引导whether 引导的主语从句可放句首，也可放句中，表“是否”if 引导的主语从句只能引导动词后的宾语Whether I will go or not depend on the weather.It remains to be seen whether / if they can finish the task in time.2.连接代词what, who, which, whose, whatever, whichever，whoever等引导What matters most is your attitude.3.连接副词when，where，why，how等引导How he made it is still unknown.4.it作形式主语为了避免句子头重脚轻，通常把形式主语it放在句首，真正的主语放在句子后面。
常见句型：(1) It is + n.+ that + 句子It is +（a pity / a shame / a fact …）+ that ...(2) It is + adj.+ that + 句子It is +（true / clear / important …）+ that ...(3) It is + 过去分词 + that + 句子It is+ said / announced / expected / believed / hoped… + that ...(4) It seems /appears / happens / turned out that + 句子(5) It hit sb./occurred to sb.that + 句子二、宾语从句【定义】在复合句中，作宾语的句子称为宾语从句。
主语从句的考点归纳
考点剖析名词性从句是指从句在句子中起名词作用，其功能相当于名词或者名词词组，可以在句子中作主语、宾语、介词宾语、表语、同位语等。
名词性从句包括四种，分别为：主语从句、宾语从句、表语从句以及同位语从句。
本篇主要介绍一下主语从句。
主语从句常由三类引导词引导，分别是从属连词that,whether,连接代词what,who,whoever,whom,which,whichever ，连接副词when,where,why,how 等。
一、从属连词(that,whether)引导的主语从句1.That he failed the exam really surprised me.他考试不及格真让我吃惊。
(That 在句子中并无实际意义，只是充当连词，后面跟的是一个完整的句子作为主语，谓语是surprise ，宾语是me)2.Whether she could be elected mayor is still un-known.她是否能当选市长还不得而知。
(whether 意思是“是否”，后面接一个完整的从句一起充当整个句子的主语成份，这句话的谓语是be 动词is,后面是表语unknown)二、连接代词what,who,whoever,whom,which,whichever 引导的主语从句代词可以在从句中作主语、宾语、表语、定语等，如：1.What he tells you is not completely right.他告诉你的并不完全正确。
（what he tells you 充当整个句子的主语，谓语动词是be 动词is ，后面是表语。
在what he tells you 这个主语成分中，tells you 后面缺少成分，因此用what 引导）2.Who will be elected president is the hottest news now.谁将当选总统是现在最热门的新闻。
三、连接副词(when,where,why,how)引导的主语从句1.When my mother will visit my grandparents de-pends on the weather.我妈妈什么时候去看望我的祖父母取决于天气。
英语学习之主语从句详解
英语语法知识讲解之名词性从句:主语从句主语从句有三类：1．由what 等连接代词引导的主语从句由what 引导的主语从句表示“…….所…….的东西”，在结构上等于一个名词加一个定语从句，what 在主语从句中要充当句子成分。
如 What we need is more time.我们所需要的是更多的时间。
what 在主语从句中作 need 的宾语，此句可改写成定语从句 :The thing which we need is more time.What is dif ficult is to do good all one’s life and never do anything bad.难的是一辈子做好事，不做坏事。
（what 在从句中作主语）由 whatever, whoever 引导的主语从句也属于这一类。
如 Whatever was said here must be kept secret.这里说的话都必须保密。
Whoever fails to see this will make a mistake. 谁看不到这一点就会犯错误。
2.由连词that 引导的主语从句在 that 引导的主语从句中，that 不但当句子部分。
如 That she will come is certain. 她来是肯定的。
That he was chosen made us very happy.他被选中了使我们都很高兴。
在更多情况下，这类主语从句都放在句子的后部，而用 it 作形式主语。
如 It is certain that you will be able to make greater progress.你一定能取得更大的进步。
It’s obvious that he is wrong.很明显，他错了。
It’s a pity that you missed such a fine talk.这样好的报告你没听到真遗憾。
理解中的名词性从句主语从句宾语从句与表语从句
理解中的名词性从句主语从句宾语从句与表语从句理解中的名词性从句：主语从句、宾语从句与表语从句名词性从句是指在句子中充当名词的从句，常出现在句子的主语、宾语和表语的位置。
其中，主语从句充当句子的主语，宾语从句充当句子的宾语，而表语从句则充当句子的表语。
下面将分别对这三种名词性从句进行详细解释和举例说明。
一、主语从句主语从句在句子中充当主语的作用，常以从句的形式出现在主句中。
主语从句常由连接词“that”引导，也可以由连接词“whether”、“if”或“wh-”引导，具体使用哪种连接词要根据具体语境来确定。
主语从句的使用具有以下特点：1. 它可以引导一般疑问句、特殊疑问句和陈述句，但在陈述句中，通常省略连接词。
例如：- Whether he will come to the party is still uncertain. (一般疑问句)- What he said is true. (陈述句)2. 当主语从句的主语和主句的主语一致时，经常使用“It”作为形式主语。
- It is important to learn a foreign language. (主语从句的主语和主句的主语一致，故使用“It”)3. 主语从句位于句首时，主句要用倒装语序。
例如：- That he came to the conference was a surprise. (主语从句位于句首，主句倒装)- Whether she can finish the project on time is still uncertain. (主语从句位于句首，主句倒装)二、宾语从句宾语从句在句子中充当宾语的作用，常以从句的形式出现在主句中。
宾语从句常由连接词“that”引导，但在口语中，常常省略连接词。
此外，宾语从句也可以由连接词“whether”、“if”或“wh-”引导。
宾语从句的使用具有以下特点：1. 它通常出现在动词后面，充当直接宾语。
名词性从句-主语从句 讲课版
名词性从句1.名词性从句：名词性从句的功能相当于 , 它在复合句中能担任等，因此根据它在句中不同的语法功能，名词从句又可分别称为一、主语从句：有时本身出现在主语的位置上，也有时出于句子结构的考虑退到句子的尾部，前面用形式主语it代替。
从句作主语时，谓语动词一般为单数形式。
结构：1.陈述句作主语从句的构成：That+陈述句+……注意：陈述句转化而来的主语从句，用连词that 引导，放句首，不可省略。
1.地球绕着太阳转是一个事实。
2.我们学好英语是很重要的。
3.你不能来到聚会真遗憾.4.他是对的，我们大家都知道。
2.it作形式主语(1)It+be+adj+(that)+主语从句.Eg.That we learn English well is important.---转化为it作形式主语：That Jack will win the game is possible.---转化为it作形式主语：常见的用法：It is certain that...可以确定......It is clear that ...显然....It is fortunate that ...幸运的是.....It is likely that ....可能......It is natural that ...很自然.....It is necessary that .... 有必要...It is strange that ...奇怪的是...It is important that...重要的是...Eg.重要的是他应该知道这件事.(2)It + be +过去分词+(that)+主语从句.常见的用法：It is said that...据说……It is reported that ...据报道……It is well known that...众所周知……It is believed that ...人们相信……It is thought that... 人们认为……It has been found that ...已经发现……It must be pointed out that ...必须指出的是……It should be noted that...应当注意的是……It has been proved that…已证实…Eg.据说他是中国最优秀的作家。
2023届高考英语语法名词性从句之主语从句全面剖析讲义
2023年高中英语语法名词性从句之主语从句全面剖析主语从句全面剖析为使同学们更好地掌握其用法,本文对主语从句语法做了一个详细的梳理，帮助大家梳理主语从句的语序，连接词的选用等内容，对于it构成的主语从句做了详细的解释。
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 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 newsI 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 mat ched players meet. 两强相争勇者胜。
Whichever (of you) comes in first will receivea prize. 无论(你们)谁先到都可以得奖。
Whichever you want is yours. 你要哪个哪个就是你的。
高考英语名词性从句之主语从句精讲(含例题) 课件36张PPT
总结：连接代词引导主语从句的用法
连接代词
1. 作用：连接主句和从句，在从句中充当主语、宾语、表语、定语
2. 分类: 充当主、宾、表：what(ever), who(ever), whom(ever)
充当定语：which(ever), whose
3. 与连接词对比
对比 相同点
连接词
连接代词
都起连接主从句的作用
地点状语：where, wherever 方式状语：how, 原 因 状 语 ： w h y,
时间类关系副词：when, whenever
when 指...的时间，在从句中做时间状语
When the speech contest will be held still needs to be discussed. 演讲比赛举办的时间还需要再讨论。 Whenever you want to come is fine with me. 无论什么时候你想来我都可以。
s方uc式ce状ed语is：cheortwain . frightened her.
在句中充当状语 Why the sun rises in the east is interesting.
原因状语：why
思考：如何选择主语从句连接词？
1. 找到从句标出来 2. 判断从句何类型 3. 判断是否缺成分 4. 判断用何连接词
whether / if 引导主语从句的区别
相同点 1. 都表示“是否” 2. 在从句中没有充当成分 3. 起连接作用 4. 可用it做形式主语，从句放句尾
区别
1. whether引导的主语从句可以放在句首 Whether the plan will be carried out is still unknown.
名词性从句--主语从句
名词性从句---主语从句主语从句subject clauses)1、概述; 在复合句中起主语作用的从句叫主语从句。
引导主语从句的词有从属连词、连接代词、连接副词等。
引导主语从句的关联词有从属连词that、whether,连接代词: who, what, which , whom, whose, whatever, who (m) ever, whichever;连接副词: when, where, how, why, however, whenever, wherever等。
That you don't like him is none of my business.你不喜欢他不管我的事。
What he said is true.他说的是真的。
2、从属连词that, whether 引导的主语从句。
从属连词that, whether 在主语从句中的作用只是引导主语从句，它们在从句中不担任成分，不能省略。
Whether she will come or not is still a question.她是否会来仍是一个问题。
That they will go is certain.他们去是肯定的。
Whether she's coming or not doesn't matter too much.她来不来没有多大关系。
3、it作形式主语引导主语从句。
如果主语从句太长，为避免句子结构头重脚轻，我们可用it作形式主语,而把主语从句放在主句谓语部分之后。
That引导的主语从句可用it代替，that 不可省略。
用作it作形式主语的结构:(1) It is/was +形容词+that从句It's natural that... 很自然.... It's obvious that...显而易见......It's fortunate that幸透的是It's impossible that. (不)可能It's unlikely that..不可能It's strange that...奇怪的是(2 It is/was +名司+that从句It's a pity that.-遺憾的是It's a fact that..事実是It's good news that..是好消息-- It's a wonder that.不足カ奇It's an honor that..非常荣幸的是--- It's a shame that.. .真是可耻It's common knowledge that .是常沢..(3) It +不及物动词+that从句It seems that.--似乎It happened that..磋巧It appears that..看来It turns out that..結果(4) It is/was +过去分词+that从句It's not known that.. --不得而知It's said that..据説It's reported that.-据狠道It's decided that..尚未决定It's believed that..据相信It's announced that..据宣布-It suddenly struck me (occur to me that.我突然想到(感觉到)-(5)其他It doesn't matter是无美緊要的It makes no difference .. ,亳无区別-It is of little consequence that..无美緊要例句:It is a pity that she has made such a mistake.地犯込祥的錯俣是令人遺憾的事。
主语语从句知识点总结
主语语从句知识点总结名词性从句：名词性从句是一类特殊的从句，它在句子中充当名词的作用。
名词性从句包括：主语从句、宾语从句、表语从句和同位语从句。
主语从句是其中的一种，以下是主语从句的知识点总结。
一、主语从句的基本结构主语从句的基本结构是“连接词+主语从句”，“连接词”一般是连词that、whether或者特殊疑问词（what, who, which, where, when, how等）。
1. 连词thatthat引导的从句在口语中常省略，仅在从句谓语动词有一些不同时才需要保留。
例如：It is clear that she is a hardworking student.（她是一个用功的学生是清楚的。
）2. 连词whetherwhether表示“是否”的意思。
用whether引导的主语从句，一般用于宾语介词后。
例如：The question is whether we should continue to support them.（问题是我们是否应该继续支持他们。
）3. 特殊疑问词特殊疑问词用来引导疑问句，也可以用来引导主语从句。
例如：What she said is not important.（她说的不重要。
）二、主语从句的用法主语从句可以在句子中充当主语，通常出现在表述事实、真理、信仰、愿望等抽象概念的句子里。
1. 表述事实例如：That he is always late is well known.（他总是迟到是众所周知的。
）2. 表述真理例如：That honesty is the best policy cannot be denied.（诚实是最好的政策是无可否认的。
）3. 表述信仰例如：What he said is beyond my belief.（他说的超出了我的想象。
）4. 表述愿望例如：That you will come to my party makes me happy.（你能来参加我的聚会让我很高兴。
英语语法解析 名词性从句 主语从句
英语语法解析名词性从句主语从句主语从句是名词性从句的一种，名词性从句包括主语从句，宾语从句，表语从句和同位语从句，在复合句（由一个主句和一个或几个从句构成的句子叫复合句）中作主语，宾语，表语和同位语。
主语从句主语从句通常放在主句谓语动词之前，在复合句中作主语，也可以用形式主语it代替，把主语从句放在主句谓语动词后面。
1.主语从句的连接词：从属连词：that，whether连接代词：what，who，which，whatever，whoever，whichever 等连接副词：when，where，why，how2.从属连词that的用法以从属连词that引导的主语从句，that没有意义，只起连接作用，不做成分，不可以省略。
That my form teacher would visit my home surprised my parents. 我的班主任要来我家，这使我父母很惊讶。
That he used to be a dancer is known to all of us. 我们大家都知道他过去是个舞蹈演员。
3.从属连词whether的用法以从属连词whether（是否）引导的主语从句，whether不可以由if代替。
Whether we will play the football match today depends on the weather. 我们今天是否举行足球比赛要看天气而定。
4.连接代词：what，who，which，whatever，whoever，whichever等的用法①连接代词what，who，which，whatever，whoever，whichever等引导主语从句时，连接代词都带有本身的含义：what （所…的），who（谁），which（哪一个；哪一些），whatever（无论什么），whoever（无论谁），whichever（无论哪个；无论哪里）②连接代词在主语从句中要作成分，作主语，宾语或定语。
名词性从句主语从句
主语从句导入：观察并指出句子成分A treehas fallenacrossthe road.Youarea student.To find your waycan bea problem.Smokingisbadfor you.一．概念：主语：主语是指句子谈论的主题，说明的人或事物。
也就是句中动作、行为、性质和状态的主体，一般位于句首主语从句：在句中充当主语的从句二·基本结构关系词简单句谓语动词宾语同位语Thathe finished writing the composition in such a short timesurprisedusall.他在很短的时间内写完作文让我们都很惊讶三关系词(引导词)1．从属连词：that whetherthat 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。
That she left him cut him to the heart.That he will come is certain.注意：有时为了使句子结构平衡, 避免 "头重脚轻”, 常用 it 作形式主语, 而把从句放在后面。
E.gThat she has made such a mistake is a pity.It is a pity that she has made such a mistake.这样就构成了下面一些常用句型:1) It is + adj. +从句It is necessary that…有必要…It is important that …. 重要的是…It is obvious that……很明显……2) It +不及物动词+从句It seems/appears that... 似乎……It happened that... 碰巧……It occurred to me that……我突然想起……3) It + be +过去分词+从句It is said that... 据说……It is known to all that... 众所周知……It is reported that... 据报道……It is believed that... 据信……;人们相信……It is suggested that... 有人建议……It must be pointed out that... 必须指出……It has been proved that... 已证明…….4) It is + n. +从句It is common knowledge that……是常识It is a surprise that …. 令人惊奇的是…It is a fact that……事实是……由whether及其他连词引导的主语从句放在句首，句后都可。
名词性从句之主语从句讲解
名词性从句之主语从句讲解TYYGROUP system office room 【TYYUA16H-TYY-TYYYUA8Q8-名词性从句---主语从句1. What is needed for the space trip is careful preparation.2. Her wish is that she can lose weight soon.3. I think that woman can reach every high achievements in many fields of science.4. We were very excited at the news that our team had won.引导名词性从句的关联词可分为三类：一．从属连词：that（无任何词意）whether, if（均表示“是否”表明从句内容的不确定性）as if ,as though（均表示“好像”，“似乎”）以上在从句中均不充当任何成分二．连接代词：what, who, whom, which，whose, whatever, whoever, whichever(作主宾表定)三．连接副词：when, where, how, why(作状语)I. 主语从句1.定义：在句子中担当主语的是一个从句,这个从句就叫做主语从句。
2.位置：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。
3.引导主语从句的关联词：(1)从属连词that,whether,if (在从句中不充当成分，仅起连接作用)That Jack won the match yesterday surprised us.Whether he’ll come here isn’t clear. (此处不能用if)(2)连接代词who, whom, whose, what, which, whoever, whatever, whichever(充当主宾表定) What she did is not known.Whoever comes is welcome.(3)连接副词 where,when,how,why(在从句中充当状语)How this happened is not clear to anyone.When the meeting will be held is decided by our manager.4.有时为了避免头重脚轻，常用it作形式主语，而把真正主语放在句子末尾。
初中主语从句讲解
主语从句名词性从句包括：主语从句、表语从句、宾语从句和同位语从句。
引导名词性从句的连词有：A.连词：that,whether,if（这三个词都不作从句的成分，同时，that 无含义，而whether和if都表“是否”）B.疑问代词：who,whom,whose,what,whichC.疑问副词：when,where,why,how（一）主语从句：在复合句中充当主语的从句。
1.that引导主语从句that引导主语从句时不同于其他的连词，既无词义也不作成分，只起单纯的连接作用，且通常不可以省。
为了强调that引导的主语从句而置之于句首时，that不可省。
①Thatthedrivercouldnotcontrolhiscarwas obvious.很明显司机不能控制住他的车了②Thatshewaschosenmadeusveryhappy.她被选上让我们很高兴③Thathewillcomeiscertain.他要来已经千真万确了★通常，that引导主语从句时用it做形式主语，把从句置于句尾，此时that有时可省。
例如：①Itwasobviousthatthedrivercouldnotcontrolhiscar.很明显司机不能控制住他②Itmadeusveryhappythatshewaschosen.她被选上让我们很高兴③Itiscertainthathewillcome.他要来已经千真万确了★如果以that从句为主语的句子是疑问句，就只能用先行词it结构。
例如：①Isitcertainthathewillcome?②Isittruethathewouldtaketherisk?▲it做形式主语有以下几种不同的结构：(1)It+be+形容词+that-从句①Itislikelythathewillcome.他可能会来②Itisstrangethatshehasevertrustedhim.她相信他，真令人奇怪(2)It+be+名词+that-从句Itiscommonknowledgethatthewhaleisnotafish.鲸鱼并不是鱼，这是常识It'sapitythatheshouldhave?catchedthetrain.(3)It+be+-ed分词+that从句Itissaidthatheisafamouswriter.据说他是个着名作家Itisreportedthattherewillbeastormthisafternoon.据报道下午将有一场暴风▲在表示建议、要求、命令等意义的被动结构中，that从句中的谓语动词常用(should)do。
名词性从句详解(主语从句、并与从句、表语从句与同位语从句)
主语从句如果一个句子在复合句中充当主语,那么这个句子就是主语从句。
主语从句主要有以下三类：1．由what等代词引导的主语从句：这类主语从句可由三类代词引起：1)whatWhat you need are more friends．What I did made my teacher angry．2)whateverWhatever I have done is for you.Whatever has been done here is helpful for your future．3)whoeverWhoever comes here will be welcome．Whoever take part in the activity will get reward．what 引导的主语从句，主句谓语动词通常用单数形式，但有两种特殊情况：a)what在从句中作主语时，主句谓语动词的单复数与从句的谓语动词保持一致。
What makes him happy also makes me happy.What are put into the box are important to me.b) 当主句中的表语是复数时，主句谓语动词用复数，否则用单数。
What he gave are five books.2．由that引导的主语从句：这类主语从句大多数用it作形式主语，而真正的主语放到句子后部，以保持句子的平稳，也有少数直接用这种从句作主语，不用it。
（主语从句位于句首时，that不可省略；当用it作形式主语，真正的主语放置在句尾，且谓语动词为seem、appear、be a pity、be a wonder、be likely时，that可省略。
）1）It’s a pity(that)you can’t come to my party．2）That she works hard makes her leaders satisfied．3）That Jack becomes a doctor is his mother’s wish. 3．由连接代（副)词及whether引导的主语从句：这类主语从句可以直接放在句首，也可以放到句尾，前面用先行词it作形式上的主语。
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名词性从句---主语从句1. What is needed for the space trip is careful preparation.2. Her wish is that she can lose weight soon.3. I think that woman can reach every high achievements in many fields of science.4. We were very excited at the news that our team had won.引导名词性从句的关联词可分为三类：一．从属连词：that（无任何词意）whether, if（均表示“是否”表明从句内容的不确定性）as if ,as though（均表示“好像”，“似乎”）以上在从句中均不充当任何成分二．连接代词：what, who, whom, which，whose, whatever, whoever, whichever(作主宾表定) 三．连接副词：when, where, how, why(作状语)I.主语从句1.定义：在句子中担当主语的是一个从句,这个从句就叫做主语从句。
2.位置：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。
3.引导主语从句的关联词：(1)从属连词that,whether,if (在从句中不充当成分，仅起连接作用)That Jack won the match yesterday surprised us.Whether he’ll come here isn’t clear. (此处不能用if)(2)连接代词who, whom, whose, what, which, whoever, whatever, whichever(充当主宾表定) What she did is not known.Whoever comes is welcome.(3)连接副词where,when,how,why(在从句中充当状语)How this happened is not clear to anyone.When the meeting will be held is decided by our manager.4.有时为了避免头重脚轻，常用it作形式主语，而把真正主语放在句子末尾。
How the book will sell depends on its author.= It depends on its author how the book will sell.That he is the best student in the class is obvious.= It is obvious that he is the best student in the class.用it作形式主语的几种常见结构：(1) It is ＋名词＋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＋从句It is natural that… 很自然It is strange that… 奇怪的是…(3) It is ＋不及物动词＋从句It seems that… 似乎… It happened that… 碰巧…It ap pears that… 似乎…(4) It ＋过去分词＋从句It is reported that… 据报道… It has been proved that… 已证实…It is said that… 据说…注意：主语从句不可位于句首的五种情况(1) if 引导的主语从句不可居于复合句句首。
(例子见上面)(2) It is said , (reported) …结构中的主语从句不可提前。
例如：It is said that President Xi will visit our school next week.(3) It happens…, It occurs… 结构中的主语从句不可提前。
例如：It occurred to him that he failed in the examination.(4) It doesn’t matter how/whether …结构中的主语从句不可提前。
例如：It doesn’t matter w hether he is wrong or not.(5)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?5.语序：主语从句用陈述语序。
(关联词位于句首不能省略)How he became a great scientist is known to us all.Who the watch belongs to is unknown.That he finished writing the composition in such a short time surprised us all.6.主语从句中注意的事项：1）主语从句后的谓语动词一般用单数。
Whatever he says is of no importance.Whoever says this is wrong.但谓语动词用单数还是复数，不可一概而论，而要视句子的意义而定What I need is money.What I need are books.2）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则不作任何成分。
What you said yesterday is right.That she is still alive is a consolation.3）it作形式主语和it用于强调句的比较：it作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化；而it用于强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。
被强调部分指人时也可用who/whom。
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.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。
It is still a mystery what caused the accident.It is a mystery that his death remained.4）whether与ifwhether引导主语从句时,常置于句首(此时whether不能用if代替),也有后移的用法(此时whether可以用if代替)Whether they will come is not yet known.It is not yet known whether/if they will go there.whether和if的区别还有：1. 引导表语从句用whetherThe question is whether you should accept it.2. whether可以引导从句作介词的宾语I’m not interested in whether they’ll go or not.It depends on whether we have got enough money.3. whether可以直接跟动词不定式连用I didn’t know whether to laugh or to cry.She hasn’t decided whether to go or not.4. 与or not连用时，只能用whether。
I don't know whether I should go there or not.随堂练习：1. has helped to save the drowning girl is worth praising.A. WhoB. The oneC. AnyoneD. Whoever2. It was he said disappointed me.A. what ; thatB. that; thatC. what; whatD. that; what3. we’ll go camping tomorrow depends on the weather.A. IfB. WhetherC. ThatD. Where4. he said at the meeting surprised everybody present.A. WhatB. ThatC. whichD. who5. was to return to school.A. That really interested himB. What really interested himC. Which really interested himD. That interest him really6._______ he made an important speech at the meeting was true.A. ThatB. WhyC. WhatD. How7. It worried her a bit ______ her hair was turning gray.A. whetherB. thatC. whatD. when8.What I say and think ___ none of your business.A. isB. areC. has D have9. Does _______ matter if he can't finish the job on time?A. thisB. thatC. heD. it10. _______ is a fact that English is being accepted as an international language.A. ThereB. ThisC. ThatD. It11. _______ what they told me really true?A. HasB. IsC. DoesD. Have12. It matters little _____ a man dies, but ____ matters much is ____ he lives.A. how; what; howB. how; it; howC. why; it; whyD. that; what; that13. ____ she couldn't understand was ____ fewer and fewer students showed interest in her lessons.A. What; whyB. That; whatC. What; becauseD. Why; that14. _______ fashion differs from country to country may reflect the cultural differences from one aspect.A. WhatB. ThatC. ThisD. Which15. -What made her parents so angry?- _______ she had failed in the examination.A. AsB. BecauseC. SinceD. That。