名词性从句 语法讲解

名词性从句1.从句的分类状语从句（分9种）从句主语从句名词性从句宾语从句表语从句同位语从句2.说明：①名词性从句的功能相当于名词，根据其在句中充当的成份，有不同的叫法。

②引导名词性从句的词语主要有：a.从属连词that，无词义，不作句子成分；b.从属连词if，whether（是否）有词义，但不作句子成分；c.从属连词as if（=as though，似乎、好像）有词义，但不作句子成分；d.连接代词who，whoever，what，whatever，whom，whomever，which，whichever，how much，how many有词义，作成分；e.连接副词when，whenever，where，wherever，why，how，however，how often，how soon，how far，how long作句子成分。

③在名词性从句中，要用陈述语序。

【例】1.I don’t kno w where does he live.(false)I don’t know where he lives.(true) 我不知道他住在哪。

2.What life in the future will be like is unknown.(true)What will life in the future be is unknown.(false)④不可用no matter who，no matter what等引导名词性从句，只能引导状语从句。

一、主语从句1.定义：若处在主语的位置上是个句子，那么这个句子就叫做主语从句。

2.注意事项：a.在主语从句中，任何引导词都不可以省去。

【例】That her hair is turning grey worries her.b.在主语从句中，不用if，用whether。

【例】Whether he will come or not is not clear.(true)If he will or not is not clear.(false)c.主语从句作主语时，谓语动词用单数。

语法解析名词性从句一、概念说明名词性从句是从句的一种，它在句中的地位和作用相当于名词。

名词性从句可以充当主语、宾语、表语或同位语。

二、主语从句主语从句用来充当整个句子的主语。

示例：1. What she said is true.（主语从句作主语）2. Whether he will come is uncertain.（主语从句作主语）3. If it rains, we will stay at home.（主语从句作主语）三、宾语从句宾语从句用来充当及物动词或介词后面的宾语。

示例：1. She asked me what my name was.（宾语从句作宾语）2. I wonder if he is coming.（宾语从句作宾语）3. He told me where he lived.（宾语从句作宾语）四、表语从句表语从句用来充当系动词后面的表语。

示例：1. The important thing is that we keep trying.（表语从句作表语）2. His wish is that everyone be happy.（表语从句作表语）3. Her dream is to become a famous singer.（表语从句作表语）五、同位语从句同位语从句用来解释或说明名词的具体内容。

示例：1. The fact that he didn't study resulted in a poor grade.（同位语从句解释the fact）2. My understanding is that we need to work together.（同位语从句解释my understanding）3. The idea that she suggested is worth considering.（同位语从句解释the idea）六、关系代词引导的名词性从句关系代词引导的名词性从句在从句中充当成分的同时，引导词也在主句中充当成分。

名词性从句语法英语语法--名词性从句讲解(一)在句子中起名词作用的句子叫名词从句(Noun Clauses）。

名词从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，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主语从句、宾语从句、表语从句和同位语从句。

一、引导名词性从句的连接1. 连接代词：who， whose， whom， what， which.有词义，在从句中担任成分。

2. 连接副词：when， where， why， how.有词义，在从句中担任成分，作状语。

3. 连接词：that， whether， if， as if在从句中不担任成分，有时可省略；二. 具体分类1、主语从句作句子主语的从句叫主语从句。

What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。

It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。

Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行，还没有宣布。

有时为避免句子头重脚轻，常用形式主语it代替主语从句作形式主语放于句首，而把主语从句置于句末。

主语从句后的谓语动词一般用单数形式。

常用句型如下：（1）It + be + 名词 + that从句（2）It + be + 形容词 + that从句（3）It + be + 动词的过去分词 + that从句（4）It + 不及物动词 + that 从句另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：It is necessary (important, natural, strange, etc.) that …It is a pity (a shame, no wonder, etc.) that…It is suggested (requested, proposed, desired, etc.) that…2、宾语从句名词句用作宾语的从句叫宾语从句。

高中名词性从句语法详解名词性从句：宾主同表（宾从，主从，同从，表从）一、宾语从句宾语从句的类型（1）主语+谓语+宾语从句He said that he wouldn’t take part in the sports meeting.（2）主语+be+adj+宾语从句I’m sure that our team will win.☆只限于少数adj. sure, certain, afraid, confident, etc（3）主语+谓语+宾（表）语+介词+宾语从句（except, in that在于，因为）He is a good student except that he is a little careless.I like the city,but I like the country better in that I have more friends there1. 宾语从句的连接词1）连词that,只起连接作用,在从句中不作句子成分,也无词汇意义,在口语中常被省略★由that 引导的宾语从句在以下情况下不能省略：(1).在主+谓+it(形式宾语)+宾补+that从句(真正宾语) 的句型中：表喜欢、憎恶等心理活动的动词或词组后习惯上先跟形宾it：hate, love, enjoy, dislike, don’t mind, feel like, appreciate, rely/depend on, count on, see to, take, owe等We must make it clear that we mean what we say.We heard it that she would get married next month.(2).由and连接的两个由that引导的宾语从句中,第二个that 不省略.He told me (that) he would come and that he would come on time. (3) 从句前有插入语：He may tell you, for example, that she is interested in Chinese(4）从句主语是that时：He says that that is a useful book(5)当that从句是双宾语中的直接宾语时，that不可省。

单个的主语从句作主语时，谓 语动词用单数形式。如果是两 个或两个以上的主语从句作主 语，谓语动词则用复数形式。 Where and when he was born has not been found. When the person was murdered and why he was murdered are still unknown.
I
名词性从句的种类
• 1.When we will start is not clear.
主语从句
• 2.Mrs Black won’t believe that her son has become a thief. 宾语从句
• 3. My idea is that we should do it right now. 表语从句 • 4.I had no idea that you were her friend.
宾语从句
在复合句中作主句的宾语,放在实义动词或介词的后 面.引导词有连词that (that 常可省略),whether, if; 代词有who, whose, what ,which; 副词有when ,where, how, why 等.如:
We believe (that) he is honest.
(4)用if不用whether的情况:
意:在主语从句中用来表示惊奇、不 相信、惋惜、理应如此等语气时，谓 语动词要用虚拟语气 “ should +do”， 常用的句型有：
It is necessary \ essential that…. It’s important that…. It’s natural that…. It's strange that …
同位语从句

This is why Sara was late for the meeting.
This is how they overcome the difficulties.
My strongest memory is when I attended an
American wedding.
5. 其他连词as if, because, as, as though 引导的表语从句
C．表示某种状态的：remain, keep, prove, continue, stay等.
1. that 引导的表语从句 that 仅起连接作用，无意义，在句中不作任何成分， 通常不可省略。这种从句往往是对主句主语的内容起 进一步解释的作用。
e.g. The chance is that one smoker in four will die from
think等变为否定形式;
e.g. I don’t think you are right．
(5) 在think，believe，imagine，suppose，guess，hope
等动词以及 I’m afraid 等后，可用so代替一个一定的
宾语从句，还可用not代替一个否定的宾语从句：
e.g. 一Do you believe it will clear up你认为天气会转晴吗
连接副词：when, where, how, why 连接代词和连接副词一般做句子的某一成份
The Subject Clause
用作主语的从句叫主语从句。引导主语从句的 连接词有：
连词that, whether；
连接代词what, whatever, who, whoever, whom, whomever, whose, which,

初中英语语法专题—名词性从句讲解名词性从句是由连接词引导的从句，用作名词的成分，常常在句子中充当主语、宾语、表语、同位语等，起到连接主句与从句的作用。

下面就是名词性从句的不同类型及其用法：主语从句主语从句作为句子的主语部分，通常由连接词 "that" 或"whether" 引导。

例如：- That he is late is not surprising.（他迟到了并不令人惊讶。

）That he is late is not surprising.（他迟到了并不令人惊讶。

）- Whether we can win the game is uncertain.（我们是否能赢得比赛还不确定。

）Whether we can win the game is uncertain.（我们是否能赢得比赛还不确定。

）宾语从句宾语从句作为句子的宾语，通常由连接词 "that" 或 "whether"引导。

例如：- I wonder whether he has finished his homework.（我想知道他是否完成了他的作业。

）whether he has finished his homework.（我想知道他是否完成了他的作业。

）表语从句表语从句用来补充说明主语的性质或状态，通常由连接词"that" 或 "whether" 引导。

例如：- The truth is that he is a good student.（事实是他是个好学生。

）that he is a good student.（事实是他是个好学生。

）- My concern is whether he understands the instructions.（我关心的是他是否理解了这些指示。

）whether he understands the instructions.（我关心的是他是否理解了这些指示。

名词性从句在句子中起名词作用的句子叫名词性从句 (Noun Clauses)。

名词性从句的功能相当于名词词组 , 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，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主语从句、宾语从句、表语从句和同位语从句。

第一节知识点讲解顾名思义，主语从句在句子中作主语。

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。

如 :What I saw was beyond any verbal description.That his hair was turning grey worried him a bit.Why the company denied the contract is still unknown.When and where the government will build a city square is under discussion.It is pretty annoying that a small part of the machine is missing.It remains to be seen whether the new novel will be well received.Tips: 主语从句的 that 绝对不能省去。

因为句子是不能做主语的，故用 that 引导。

若去掉则没有了主语，而宾语从句的 that 可省。

主语从句： That he is right is known to all of us.宾语从句： We all know (that) he is right.1.It 作形式主语和 it 引导强调句的比较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 引导的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。

1、It depends on weather if she will come back on time .
2、I asked him if he could do me a favor .
If与whether的区别：
1、If不能引导放于句首的主语从句，而whether可以。 2、引导表语从句用whether，不用if。 3、引导同位语从句用whether，不用if。 4、whether可以引导从句作介词的宾语，不用if 。 5、whether or not 连在一起可以，但if不可以。而 “whether-----or not = if -----or not”
同位语从句：
定义：在复合句中充当同位语的句子。 同位语从句用来对其前面的抽象名词进行解释说明，被解释说明的词和 同位语在逻辑上是主表关系。 同位语常见名词：fact, suggestion, advice, idea, decision, news, thought, hope, belief, truth, doubt, promise, possibility, truth, warning, message, reason, report, question，explanation, wish, problem等。 常见的连接词：that, whether, what, who, how, when, where等。 用法： The thought that I want to buy my mother a birthday gift makes me excited.that 引导的同位语从句，解释说明 thought，从句不缺成 分 There is some doubt whether he will come. whether 引导同位语从句，if 不能引导同位语从句 we haven’t made the decision where we are going to spend our vacation. 有时同位语从句可以不紧跟解释说明的名词后面。 The news is surprising that he won the match.

now.
表语从句
• 4.I had no idea that you were her friend.
同位语从句
什么是名词性从句?
在英语的句子结构中，本来该由名词充当的主语、宾 语、表语和同位语，由一个句子来充当,这个句子就叫 名词性从句。
主语从句 ( The Subject Clause)
名
词 宾语从句 ( The Object Clause) 性
I 名词性从句的种类
• 1.When we will start is not clear.
主语从句
• 2.Mrs Black won’t believe that her son has
become a thief.
宾语从句
• 3. My idea is that we should do it right
错误 That he will not come to the meeting this evening is true.
3).whether可以引导主语从句 解释为”是否”,但if不能.
4).whoever, whatever, whichever等词可以引导主 语从句, 但no matter who, no matter what 等不能, 它们只能引导让步状语从句.
2).连接代词: who, whom, whose, what, which, whoever, whatever, whichever
Whose bag is it ?
It can`t be told. Whose bag it 来自s can`t be told.
It can`t be told whose bag it is .
Will we visit the Great Wall tomorrow? It has not been decided.

名词性从句名词性从句包括主语从句、宾语从句、表语从句和同谓语从句。

一、连接词连接代词：that, what, who，which, whom，whose, whatever, whoever, whichever等连接副词：whether, how, why, when ,where, wherever等二、连接代词（除that外）和连接副词在名词性从句中都有词义，它们除了引导名词性从句外，还在从句中充当成分，即做主语、宾语、表语、定语和状语。

Who will go there is not important.Where she has gone hasn’t been known yet.I don’t know what I should do.He asked whose dictionary it was.Please tell me when we shall discuss our work plan.I have no idea how soon they are coming.要注意以下几点问题：1、连接代词‘that’的用法：在名词性从句中that 无词义，在从句中不充当任何句子成分，只起连接从句的作用，在宾语从句中，that在口语中可以省略。

但在引导主语从句时不能省略。

That he was chosen made us very happy.We heard the news that our team had won.The truth is that he is the best in his class.He said (that) he would see me the next week.2、引导宾语从句的that可省略，但及物动词后有两个宾语时，可省略第一个that, 不省略第二个that；如有形式宾语时，连接真正宾语的that 不能省略。

They made it a rule that they got up at six every day.3、由连词that引导的名词从句很少做介词的宾语，只在except, but , besides介词后看到，其他一些介词的宾语从句如果由连词that 引导，需用it作形式宾语。

名词性从句详解名词性从句包括主语从句、表语从句、宾语从句、同位语从句。

其关联词有连接词that，if，whether；疑问代词who，what，which和疑问副词when，where，how，why等。

一.语法讲解1.主语从句主语从句在句中做主语。

它可以放在主句谓语动词之前，但多数情况由it作形式主语，而把主语从句放在主句之后。

例如：Who did that is known to all.It is interesting that you should like him.2.表语从句表语从句在句中作表语，位于主句中的系动词之后。

如：The question is who can complete the difficult task.表语从句不能用if引导，但可用as if引导。

例如：He looked as if he was going to cry．3.同位语从句同位语从句跟在名词后面，进一步说明该名词的具体内容。

引导同位语从句的名词主要有fact，news，promise，idea，truth等。

连接词用that（不用which），及连接副词how，when，where，why等。

例如：His delay is due to the fact that the car went wrong halfway．The news that our team has won the match is true.She asked the reason why there was a delay．4.宾语从句1.宾语从句在句中作及物动词或介词的宾语。

例如：We can learn what we did not know．He will talk to us about what he saw in the U.S.如果主句的谓语动词是及物动词make，find，see，hear等，则把宾语从句置于宾语补足语之后，用it作为形式宾语。

名词性从句的语法解析名词性从句是指在句中充当名词的成分的从句，可以作主语、宾语、表语、同位语等。

名词性从句的引导词有“从属连词”和“连接代词”两种。

一、主语从句主语从句在句中充当主语，常引导主语从句的连接词有“that”和“whether/if”。

其中，“that”在口语中常省略，而“whether/if”则一般用于句中有“or not”时。

例如：1. That he passed the exam is good news.（非正式：He passed the exam is good news.）2. Whether he will come to the party is still uncertain.（非正式：If he will come to the party is still uncertain.）二、宾语从句宾语从句在句中充当宾语，常引导宾语从句的连接词有“that”、“whether/if”、“what”和“who/whom”。

其中，“that”在口语中常省略。

例如：1. She said that she would go shopping later.（非正式：She said she would go shopping later.）2. I don't know whether/if he is coming to the party.（非正式：I don't know if he is coming to the party.）3. She asked me what I wanted for dinner.4. He asked who/whom I was talking to on the phone.三、表语从句表语从句在句中充当表语，常引导表语从句的连接词有“that”、“whether/if”和“what”。

例如：1. The important thing is that we are safe.（非正式：The important thing is we are safe.）2. The question is whether/if he will pass the exam.3. The problem is what we should do next.四、同位语从句同位语从句通常用来进一步解释说明某个名词或代词指代的内容，引导同位语从句的连接词有“that”、“whether/if”、“what”、“who/whom”等。

只能用whether不能用if的情况
1.在介词后面： I’m thinking of whether we should go fishing. We didn’t think about whether it would rain the next day. 2.在动词不定式前： They asked me whether to sit at the front.
.
2.注意点
1).宾语从句一律用陈述句的语序. 2).引导宾语从句的连词that也无实际意义,多数 情况下可以省略. 3).whether和if都可以引导宾语从句,但二者用 法不同.
5).that在宾语从句中的省略与保留
(1).在主+谓+it(形式宾语)+宾补+that从句(真正宾语) 的句型中不省略. 例: We must make it clear that we mean what we say. (2).由连词and连接的两个由that引导的宾语从句中, 第一个that 可以省略,第二that不能省. He told me (that) he would come and that he would come on time. (3)that一般不充当介词宾语偶尔可作 except, in ,but的宾语;其它介词后要用that 从句作宾语须用it 作形式宾语.
Hale Waihona Puke 1. ____ we can't get seems better than ____ we
have. A.What , what C. That , that
B. What , that D. That , what
2. It worried her a bit ____ her hair was turning grey. A．while C．if B．that D．for

语法讲解：名词性从句语法讲解：名词性从句名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。

因此，名词性从句可分为主语从句、表语从句、宾语从句和同位从句。

一、引导名词性从句的连接词连接代词：who，whose， whom， what， which.有词义，在从句中担任成分，如主语、表语、宾语、或定语等。

2. 连接副词：when， where， why， how.有词义，在从句中担任成分，作状语。

连接词：that， whether，if， as if.that 无词义，在从句中不担任成分，有时可省略；if （whether）， as if虽有词义，但在从句中不担任成分。

注意：连接代词与连接副词在句中不再是疑问句，因而从句中谓语不用疑问式。

连接代词与连接副词在从句充当句子成分，连接词whether 和if（是否），as if （好像）在从句中不充当句子成分，只起连接作用。

根据句义，如果连接代词与连接副词，whether、if 和as if 都用不上时，才用that作连接词（that本身无任何含义）。

二、主语从句主语从句在复合句作主语。

g. Who will ga2. 用it作形式主语，主语从句放在句末。

g. It doesn‘t mauch wu willat引导主语从句时，不能省略。

g. That he suddenly fell ill last week made us surprised.三、表语从句表语从句在复合句中作表语，位于系动词之后。

g. The question was who could g2. 引导表语从句的连接词that有时可省去。

g. My idea is （that）we can gadlw四、宾语从句宾语从句在复合句中作宾语。

引导宾语从句的连词that一般可省略。

g. I hope （that）everything is all rig2. 介词之后的宾语从句，不可用which或if连接，要分别用what或 wg. I'd in wu'vd the work……I'd in what you've saidwhether与if都可以引导宾语从句，常可互换。

名词性从句第一部分：语法讲解名词从句是指在句子中起名词作用的各种从句。

根据它们在句子中所起的作用不同，名词从句可以分为主语从句、表语从句、宾语从句和同位语从句。

如：That the earth is round is a fact.I don’t know if he needs my help.I don’t know where he went.2．主语从句1）主语从句在句中作主语。

如：Whether he will accept the invitation is not clear.他是否会接受邀请还不清楚。

When he left is unknown.他什么时候离开还不知道。

That he will come to the discussion is certain.他来参加讨论是肯定无疑的。

2）主语从句放在句首，句子常常显得比较笨重，因此常把它移至句子末尾，而用it作形式上的主语。

如：It is strange that she did not come yesterday. 很奇怪，她昨天没有来。

It has not been announced when the plane is to take off.飞机何时起飞还没有宣布。

It is a pity that Mr.Brown can’t attend our English meeting.真可惜，布朗先生不能出席我们的英语晚会。

3）有些用“it”作形式主语的主语从句结构已形成固定的用法。

a)It is +名词+从句如：It is a fact that…事实是……It is common knowledge that………是常识b)It is +形容词+that从句如：It is necessary that…有必要……It is likely that…有可能……It is important that…重要的是……c)It is +过去分词+从句如：It is said that…据说……It is reported that …据报道……It is well known that…众所周知……It is estimated that…据估计……d)It +不及物动词+从句如：It seems that …好像……It happened that…碰巧……如：It is estimated that millions of galaxies exist in the vast space outside the Milk Way.据估计，在银河系之外的辽阔星空中存在着千百万个星系。

初中英语语法复习讲义之名词性从句一、概说名词性从句，即指具有名词性质的从句，它包括主语从句、宾语从句、表语从句和同位语从句。

名词性从句是高中英语学习中的一个语法重点，也是历年高考重点考查的内容之一。

学习名词性从句主要应注意其引导词的用法与区别，从句的词序以及名词性从句与其他从句的区别。

二、主语从句1.主语从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What we need is money.我们需要的是钱。

What I want to know is this.我想知道的就是这一点。

Whether they would support us was a problem.他们是否会支持我们还是一个问题2.主语从向与形式主语it有时为了考虑句子平衡，通常在主语从句处使用形式主语i，而将真正的主语从句移至句末。

这分三种情况:(1)对于以连词thatgl导的主语从句，通常用形式主语代主语从句:It’s a pity that he didnt come.很遗憾他没来。

(2)对于以连接代词(副词)引导的主语从句，可以使用形式主语代主语从句，也可直接在句首使用主语从句:Whether they wouldsupport us was a problem.他们是否会支持我们还是一个问题。

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

(3)对关系代词型what引导的主语从，通常不用形式主语，总是主语从句放在句首:What we need is money.我们需要的是钱。

What I want to know is this.我想知道的就是这一点。

(4)如果句子是疑问句，则必须用带形式主语it的结构:Is it true that he is the girl's father? 他是那女孩的父亲，是真的吗?How is it that you are late again? 你怎么又迟到了?3.连词that的省略问题引导主语从句的连词that有时可省，有时不能省，其原则是:若ha导的主语从句直接位于句首，则ha不能省略;若hat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则可以省略: That you didn’t go to the talk was a pity. 很遗憾你没去听报告。