英语语法——名词性从句精讲
语法精讲03-名词性从句
三、名词性从句(一)名词能做什么成分？1.The movie looks attractive.主语2.I appreciate his mother.宾语3.Gump is a man.表语4.I enjoy the part,the end.同位语（同样位置的语。
作文中只要见到名词，都可以在他后面再加一个名词，作为他的同位语。
）Teamwork ,a Chinese conventional virtue ,plays a crucial role on the road to glories.(二)什么是名词性从句？1.什么是从句：引导词加主语加谓语2.什么是名词性从句：名词在句子中能够充当什么成分，从句在句子中也能充当什么成分，这就是名词性从句。
名词性从句一共包括四类：主语从句，宾语从句，表语从古和同位语从句1)What I saw is attractive.2)I appreciate what she said.3)Gump is who we should learn from.4)I enjoy the part that a feather is flying in the sky.(三)名词性从句的引导词1.That He has got divorced is my fault.2.Whether he Has got divorced is obvious.3.Who he will marry is a secret.名词性从句的引导词是按照从句的类型分的类，一共将引导词分成三类：1.That：当从句是陈述句时。
并且that在从句中没有意思也不充当任何成分，不可去掉2.Whether：当从句是一般疑问句时。
Whether在从句中依然不充当任何成分，但是意思可以翻译成“是否”。
3.所有的特殊疑问词：当从句是特殊疑问句时。
所有引导词在句子中都充当了本来充当的成分，并他具有确定的的意思，并且英语中所有的从句都应该是陈述句的形式，也就是引导词加主语加谓语的形式。
高考英语语法完全讲解——名词性从句课件(共17张PPT)
三、what/whatever与
which/whichever的区别
what/whatever意为“什么/无论什么”，描述的事物在上下 文中没有范围；which/whichever意为“哪个/无论哪个”， 描述的事物在上下文中有范围。 To be honest, I can hardly understand what/whatever you have said. Here is the dress. This is what I have been dreaming of. Here are many beautiful dresses. You can choose whichever you like.
高考英语语法完全讲解 名词性从句
定义及分类
在句中起到名词所能充当的句子成分的从句称之 为名词性从句，名词常用来作主语、宾语、表语、 同位语，因此，对应的名词性从句可以分为四大 类：主语从句、宾语从句、表语从句、同位语从 句。
主句从句
1、作句子主语的从句叫作主语从句。 2、为避免句子头重脚轻，常用形式主语it代替主语从 句，把主语从句置于句尾。常用的句型有：It is/was+ 形容词/名词/过去分词+that从句。
表语从句
位于系动词之后作表语的从句叫表语从句。 The problem is who is to pay and when we can start.
同位语从句
同位语从句说明其前面名词的具体内容。通常由that引 导，常接同位语从句的名词有：news, conclusion, possibility, rumor, certainty, story, word, mystery, idea, doubt, hope, truth, question, belief, fact, message, evidence, information, explanation, rule, probability, question, wish, thought, statement, report, opinion, principle等。
2023届高考英语语法名词性从句精讲之四大从句用法大全讲义
2023年高中英语语法名词性从句精讲之：四大从句用法大全主语从句主语从句的概念：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。
主语从句通常由从属连词that，whether，if和连接代词what，who，which whatever，whoever以及连接副词how，when，where，why等词引导。
that在句中无词义，只起连接作用。
主语从句用法：1、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：如：That he is still alive is a wonder. 他还活着，真是奇迹。
When we arrive doesn't matter. 什么时候到没有关系。
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、主语从句与形式主语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it，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that引导的主语从句，通常用形式主语代主语从句：如：It's a pity that he didn't 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：如：Whether they would support 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引导的主语从句，通常不用形式主语，总是主语从句放在句首：如：What we need is money. 我们需要的是钱。
名词性从句语法
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。
译林版八年级上册英语语法精讲
译林版八年级上册英语语法精讲一、名词性从句名词性从句是指在句子中充当名词的从句。
常见的名词性从句有三种：主语从句、宾语从句和表语从句。
1. 主语从句主语从句在句子中作主语，常常由连词“that”引导，也可以由“whether/if”引导。
例如：- That he is innocent is obvious.（他是无辜的是显而易见的。
）2. 宾语从句宾语从句在句子中作宾语，常常由连词“that”引导，也可以由“whether/if”引导。
例如：- I believe that he is telling the truth.（我相信他在说实话。
）- She asked me whether/if I had finished my homework.（她问我是否完成了作业。
）3. 表语从句表语从句在句子中作表语，常常由连词“that”引导，也可以由“whether/if”引导。
例如：- It is not clear whether/if he is satisfied with the result.（他是否对结果满意还不清楚。
）二、定语从句定语从句是指在句子中作定语的从句，用来修饰一个名词或代词。
定语从句通常由关系代词或关系副词引导。
例如：- The book that I borrowed from the library is very interesting.（我从图书馆借来的那本书非常有趣。
）- The girl whose father is a doctor is my classmate.（那个父亲是医生的女孩是我的同学。
）三、状语从句状语从句是指在句子中作状语的从句，用来表示时间、原因、条件、目的、让步、结果等。
常见的引导词有：when、while、before、after、since、because、if、unless、although、so that等。
例如：- I will go to bed when I finish my homework.（我完成作业后就会去睡觉。
名词性从句讲解-思维导图-附练习题-高中英语语法-三大从句-语法讲解与练习
名词性从句讲解思维导图（附练习题）catch a cold。
Ⅲwhichever ‘无论哪个;无论哪些’，既指人，又指物. 可修饰名词与of连用Whichever book you borrow doesn’t matter to us。
Whichever of us fulfills his task will lend a hand to others。
定义：在复合句中充当宾语功能的句子叫宾语从句We can learn what we didn't know。
We find it necessary that we （should）practice English every day.★某些作表语的形容词，如sure，happy, glad，certain等之后可带宾语从句I am glad that you can come and help me.:①wish/would rather后的宾语从句中要用虚拟语气。
I wish I had finished my homework yesterday。
I’d rather you had been there yesterday②在表示建议,命令, 请求的词后面的宾语从句当中用should + V，可以省略His pale face suggested that he was ill so I suggested that he should goto see the doctor.He insisted that he was innocent and insisted that he should be set free.③注意it作形式宾语的结构We all thought it a pity that we had missed the lesson。
I took it for granted that they were not coming.④ that一般不接介词宾语，偶尔可作except， in的宾语；其它介词后面需用it作形式宾语He differs from his roommates in that he devoted his spare time toreading.He knows nothing about Jim except that he is from London。
名词性从句精讲
1)The news （that /which） he told is right.
（that引导的是定语从句，that在从句中作宾语）
2)The news that Tom would go abroad is right.
连接词位置
请用正确的连接词填空。 That 1____________ he finished writing the composition in such a short time surprised us all. 2.Whoever comes will be welcome. ____________ What 3.______ we need are good doctors. 4. ______ we must study for is a question of Whom great importance.
三．① 宾语从句中，用 It 作形式宾语
it 不仅可以作为形式主语，还可以作为 形式宾语而真正的宾语that 从句则放在句 尾，特别是在带复合宾语的句子中。 例如： We thought it was good news that the fog had finally gone.
We thought （that）the fog had finally gone was good news.
宾语从句：连接词在及物动词，介词， 间接宾语，形容词之后，且that可省略。
请用正确的连接词填空。 1.The problem is _____millions of people die of that illnesses caused by smoking. 2.The question remains _______we can whether win the people. 3.It looked _______it was going to snow. as if 4.This is ________I want to say. what where 5.His trouble is ________he can find a new job.
高考英语必考语法点精讲精练：名词性从句(含高考真题)
⑤ We haven’t decided __w_h_e_t_h_e_r__ to take part in the competition. ⑥ No one have settled the question so far w__h_e_t_h_e_r the world will
The important thing in life is that you should have a great aim and the determination to attain it.
Appositive clauses:
e.g.: There is no doubt that he will win the game. He must answer the question why he did that. He failed again due to the fact that he didn’t work hard.
Tips: Nouns can function as subject, object, predicative, appositive.
Definition:
➢What impresses me most is your smile.
TC➢itlpDaosodu:nasey’.sttphuattofuffntciltlitoonmaosrrsouwbwjehcatt,sohboujeldctb,e done
His broad smile suggested that he __h_ad__e_n_c_o_u_n_te_r_e_d____ (encounter) someone he adored.
whether & if（只用whether情况）
高中英语语法-名词性从句精讲(共73张PPT)
Whoever wants the book may have it. I’ll do whatever I can to help him. Buy whichever is cheapest.
连接副词 when, where, how, why
when • When they will start is unknown yet. where • Where she has gone is a mystery. how • How this happened is not clear. why • Why he did that wasn’t quite unclear.
主语从句关联词 连词 that, whether 连接代词 what, who, whom, which 连接副词 when, where, how, why
连词 that, whether
只起连接作用 在从句中不充当任何句子成分
• That he will win is certain.
• It has been reported that sales of beef in China will increase.
宾语从句关联词 连词 that, whether; if 连接代词 what, who, whom, whose, which 连接副词 when, where, how, why
• I doubt _______ he will come soon. • I do not doubt _____ he will come soon. • Do you doubt _____ he will come soon?
• what surprised me was what he said.
高中英语名词性从句精讲
高中英语名词性从句精讲从句是相对于主句而言的,即它是从属于某一个主句,而不能单独作一个句子。
在英语中,主要有三大从句,即名词性从句（包括主语从句,宾语从句,表语从句,同位语从句）、形容词性从句（即定语从句）、副词性从句（即状语从句,包括时间、条件、结果、目的、原因、让步、地点、方式等）。
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。
引导名词性从句的连接词可分为三类：（1）从属连接：that, whether, if（不充当从句的任何成分）（2）连接代词：what, whatever, who, whoever, whom, whose, which.（3）连接副词：when, where, how, why名词性从句知识点汇总1名词性从句的分类名词性从句，包括四种从句，即主语从句、宾语从句、表语从句、同位语从句。
因为主语、宾语、表语、同位语这四种成分均可以由名词构成，所以这四种从句在主句中都充当了名词的作用，故将这四种从句统称为名词性从句。
如：1.That she will help me made us happy.（主语从句）2.I can understand what he said.（宾语从句）3.This is where I was born.（表语从句）4.The fact that a heavy earthquake happened made me crazy.（同位語从句）2名词性从句的连接词分类1.that（无含义，不充当成分）2.whether,if（有“是否”的含义，但不充当成分）3.连接代词：what, whatever, who, whoever, whom, whomever, whose, which, whichever.（在从句中做主语、宾语、表语和定语）连接副词：when, whenever, where, wherever, how, however, why （在从句中做状语）4. as if,as though,because（不充当成分，在名词性从句中只引导表语从句）3连接词 that 在名词性从句中可以省略的三种情况1.it 做形式主语，that引导主语从句时It is said (that) he has been studying abroad.据说他一直在国外学习。
高考英语语法名词性从句高频考点精讲与精练
高考英语语法名词性从句高频考点精讲与精练考点一、名词性从句的分类与判断引导名词性从句的连接词用法区别 引导词是否担任成分 有无意义 thatwhetherwhWhat 与who 担任主语或宾语What happened/seemed/is knownWhat SB said/did/wanted/used to be/looks like考点二、名词性从句的语序在名词性从句中一律用语序The problem isA. when we will startB. when will we start考点三、主语从句主语从句: 在句中作主语的句子叫主语从句根据引导词可分为根据其在主句中担任的成分可分为X（一）主语从句的复合句主谓一致一般情况下单个的主语从句作主语，谓语动词用; 两个或以上的主语从句作主语，谓语动词用。
如:When he was born_______(be) not clear.When the person was murdered and why he was murdered_______ (be) still unknown.Who laughs last_______ (laugh) best.（二）主语从句五种句型(1) It is necessary/surprising/positive/certain/clear/obvious/evident/apparent/likely/probable/p ossible that sb do(2) It is a pity/a shame/an honour/a fact/a surprise/ a wonder/no wonder/ a coincidence/one’s responsibility/duty that sb do(3) It is said/known/believed/expected that sb do(4) It happens/comes about/occurs to sb/strikes sb/hits sb/turns out/worries sb a lot /seems/matters that sb do (It doesn't matter whether sb do)(5) What is known is that sb do考点四、宾语从句在复合句中用作宾语的从句叫宾语从句介词后的从句也叫宾语从句He was interested inyou told him.（一）that引导的宾语从句改错：She told me that she lived in Beijing and she was an actress .（二）用whether或if引导的宾语从句①I don’t know whether or not he will help us.②I don’t care whether you have money.③I wonder whether sb do④He asked whether sb do⑤I am not sure whether sb do（三）宾语从句中的时态呼应主句是一般现在时，从句.①I know that he (study) English every day.②I know that he (study) English last term.③I know (that) he (study) English next year.④We know that he (study) English since 1998.主句用一般过去时，从句①We believed that he (earn) enough money to build a house.②The teacher told us that he (leave) us for America.当从句表示的是客观真理，科学原理，自然现象，则从句③The teacher told us that the sun（rise）in the east.（四）否定转移:I/ We think (suppose, expect, believe, guess, imagine) that sb not…变为I/ We don’t think that sb do sth判断改错：①We believe that he won’t win the game.判断改错：②He thinks he won’t do so.（五）it做形式宾语1、句型为"6123结构"2、like it/dislike it /hate it that sb doI’d appreciate it if sb dosee to it/rely/depend on it/take it for granted that sb dokeep it in mind that sb do (不能用it)（六）doubt后的宾语从句I doubt whether… I am not sure whether…I don’t doubt that…I am sure that…Do you doubt that… Are you sure that…例句：①We doubt he can win the game.②I don’t doubthe will win the game.（七）suggest/order宾语从句suggest that sb should do建议suggest that sb do/did/will do说明，以为着，认为①He suggested that a meeting_______ (hold) immediately.②The smile on his face suggested that he_______ (pass) the examination. insist that sb should do坚持要求insist that sb do/did/will do坚持认为①I insist that she _______ (do) her work alone②He insisted that he_______ (be) right.考点五、表语从句:表语从句:在句中作表语的句子叫表语从句。
英语名词性从句重难点精讲
▲注意辨别it作形式主语与it引导的强调句型的差异。如果把句中的it is/ was ... that/ who ...去掉,剩余部分仍能组成一个意义和结构均完整的句子,则原句是强调句型。
It was last summer that he graduated from the college.（→He graduated from the college last summer.） （强调句型）
It is strange that he didn’t come to school.
▲需要注意的是,当 what作“……的东西”讲引导主语从句时,一般不用it作形式主语。whatever， whoever， whichever引导的主语从句一般不用it作形式主语。
（×）It is more experience what he needs. （ 应说:What he needs is more experience.）
▲what指无限定范围的选择。若已限定了范围,则应用which。
That is what he chose.
Which team has won the game is not known yet.
▲what （ever），whoever， whichever 等是双重关系代词,它既起先行词的作用,又起关系代词的作用,此时不可在这些词前加that， all或在这些词后再加关系代词。
（×）All what she said is true. （可说All that she said is true. 或 What she said is true）
（×） Whatever that is worth doing should be done well. (应去掉that)
名词性从句精讲
名词性从句专题在一个句子中，名词能作主语、宾语、表语和同位语。
当我们在一个句子中用一个句子来担当主语、宾语、表语和同位语时，这个句子就叫做主语从句、或宾语从句、或表语从句、或同位语从句。
这些从句的统称为名词性从句。
名词性从句的功能相当于名词词组。
所以按其句法功能，名词性从句可分为主语从句、表语从句、宾语从句和同位语从句。
引导名词性从句的有连接词that, whether 和if，关系代词who, whom, whose, what, which, whatever, whichever, whoever以及关系副词when, where和how。
任何一种从句都必须由一个引导词来引导。
引导名词性从句的引导词在语法上称为连接词。
而连接词又根据它们在句子中的不同作用又被划分为：连接词连接代词连接副词. 一、名词性从句的引导词有：连接词：that、if、whether连接代词：who/ whom/whose/what/which/wh_ever连接副词：when/where/why/how/二、各种连接词的用法：1.连接词that、whether、if 不在它们引导的主语从句中充当句子成分。
2. 连接代词who、whose、what、which等都在句子中担当一个句子成分。
比如：主语、宾语、表语、定语等等。
3. 关系副词when、where、how、why等分别在句子中作时间状语、地点状语、方式状语等等。
主语从句（The Subject Clause）作句子主语的从句叫主语从句。
主语从句通常由从属连词that，whether，if和连接代词what，who，which，whatever，whoever以及连接副词how，when，where，why等词引导。
that在句中无词义，只起连接作用；连接代词在从句中起名词的作用，在句中既保留自己的疑问含义、又起连接作用，作主语、宾语、表语、定语等；连接副词在从句中起副词的作用，作状语。
高考英语语法总复习之名词性从句课件
A. What
B. That
C. It
D. As
05. ______ is going to do the job will be decided in tomorrow’s meeting.
A. Which
B. That
C. What
D. Who
宾语从句
陈述
• that He believes that the earth is flat. ➢ that一般可以省略，但在如下情况则不能省
同位语从句
陈述
• that
The news that he has fallen in love has spread across the school.
疑问
• whether
I have no idea whether he’ll come or not.
• wh-/how(-ever)
It is a question how he will get a good score without memorizing words.
that
无意义，不作从句主干成分，在宾从中可省
I hear (that) he has joined the football club.
有意义，不作从句主干成分，不省略
I didn’t know whether/if he would attend the concert.
whether和if
两者区别
1) 并列几个宾语时，从第二个起不省 He believes (that) the earth is flat and that the sun turns around the earth. 2) 有插入语等其它成分干扰 He said, I remember, that he would help you, but…
【语法课件】高考英语名词性从句讲解(最全版)
1、主语从句 ( subject clause )
分类
2、表语从句 ( predicative clause ) 3、宾语从句 ( object clause )
4、同位语从句 ( appositive clause )
引导词
从属连词（3个）：that 、if、 whether
连接代词 （9个）：who、 whom 、 what、 which、 whose、 whoever whomever、 whatever、 whichever、
7.The doctor can hardly answer the question
_w__h_e_t_her the old man will recover soon.
名词性从句引导词的用法（2）：
“who”---“谁”、作主语、起连接作用
“whom”---“谁”、作宾语、起连接作用
连接代词
（表语从句）
3、You could choose whichever book you want .
（宾语从句）
名词性从句引导词的用法（4）：
“when”-- “什么时候”、作状语、起连接作用
连接副词
“where”-- “什么地方”、作状语、起连接作用 “why”---- “为什么”、作状语、起连接作用
表语从句
“whether”---“是否”、不作成份、起连接作用
1、Whether she will come back on time depends on
weather（. 主语从句）
2、The problem is whether you could give us some
valuable advice（. 表语从句）（宾语从句）
2025届高考英语语法复习名词性从句知识讲解练习讲义
名词性从句讲解练习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】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。
高考英语语法一轮复习——名词性从句精讲及练习(附答案)
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。
一．主语从句主语从句是在主句中作主语的句子，它由连接词引导，通常位于谓语动词之前。
1. 连词：在从句中不充当任何成分，常用见的引导主语从句的连词有三个，即that, whether和if.That he got the first prize excited him much. 他获得一等奖一事使他非常兴奋。
Whether you can succeed or not depends on how hard you work at it. 你能否功取决于你努力的程度。
注意：whether引导的主语从句常用置于句首，表示“是否”之意；if引导主语从句时不置于句首。
2. 连接代词：在从句中起名词或代词的作用，常作从句的主语、宾语、表语或定语，有具体意义且不能省略。
常见的连接代词有who, whom, whose, what, which, whoever, whomever, whatever, whichever.What we should do with the problem is undecided. 我们如何处理这上问题还未作出决定。
3. 连接副词：在从句中起副的作用，常作从句的状语，表示时间、地点、原因、方式等。
常见的连接副词有when, where, how, why, whenever, wherever, however等。
How they will solve the serious problem has not been decided. 他们将如何解决这个严重的问题还没有决定。
Why he did that wasn’t quite clear. 他为什么做那件事还不十分清楚。
专升本英语从句语法知识点精讲
专升本英语从句语法知识点精讲在专升本英语的学习中，从句语法是一个重点和难点。
掌握好从句语法，对于提高英语水平、在考试中取得好成绩以及在实际应用中准确表达意思都有着至关重要的作用。
接下来，让我们一起深入学习和探讨专升本英语中常见的从句语法知识点。
一、名词性从句名词性从句包括主语从句、宾语从句、表语从句和同位语从句。
（一）主语从句主语从句在句子中充当主语，通常位于句首。
例如：“What he said is true”（他说的是真的。
）在这个句子中，“What he said”就是主语从句。
需要注意的是，为了避免句子头重脚轻，常用 it 作形式主语，而将真正的主语从句放在句末。
比如：“It is obvious that he is wrong”（很明显他错了。
）（二）宾语从句宾语从句在句子中充当宾语，常跟在及物动词、介词或某些形容词后。
例如：“I believe that he will come”（我相信他会来。
）“She is worried about what she should do”（她担心她该做什么。
）宾语从句的时态要根据主句的时态来变化。
一般情况下，如果主句是一般现在时，宾语从句可以根据实际情况使用任何时态；如果主句是一般过去时，宾语从句则要用相应的过去时态。
但如果宾语从句表示的是客观真理、自然现象等，无论主句是什么时态，从句都要用一般现在时。
（三）表语从句表语从句在句子中充当表语，位于系动词之后。
例如：“The problem is whether we can finish the work on time”（问题是我们能否按时完成工作。
）（四）同位语从句同位语从句用于解释说明前面的名词，通常与先行词在内容上等同。
常见的先行词有 idea, news, fact, belief 等。
例如：“The news that he won the game is exciting”（他赢得比赛的消息令人兴奋。
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名词性从句精讲在复合句中起名词作用的从句叫名词性从句，包括作主语从句、表语从句、宾语从句和同位语从句。
(1)主语从句就是在复合句中作主语的从句。
主语从句常用that, whether, who, whom, whose, what, which, when, where, how, why, whatever, whoever等引导。
如：Whether he will be able to come remains a question. 他是否来还是问题。
That China is a great socialist country is well known. 众所周知，中国是一个伟大的社会主义国家。
注：为避免头重脚轻，使句子平衡，常用it作形式主语，而将主语从句后置。
如上述第二例常说成：It is well known that China is a great socialist country.但是，由连接代词what, whatever, whoever等引导的主语从句一般不能用形式主语。
如：What he found surprised me greatly. 他的发现使我非常吃惊。
Whoever is finished may rest. 凡是做完工的人都可以休息。
(2)表语从句就是在连系动词之后作表语的从句。
引导表语从句的连接除与引导主语从句的连接词外，还有as if，as though。
如：The question is whether he is able to do it alone. 问题是他能否单独做这件事。
It looks as if (though) it is going to snow. 天好像要下雪似的。
注意：要区分以下句式：1. that’s why+结果；that’s because+原因。
2. the reason why /for…is that…He is absent. That’s because he is ill. 他缺席，这是因为他生病了。
He is ill. That’s why he is absent. 他病了，这就是他缺席的原因。
The reason why he is absent is that he is ill. 他缺席的原因是他生病了。
(3)宾语从句就是在复合句中作宾语的从句。
引导这宾语从句的连接词与引导主语从句的连接词基本相同。
如：They didn’t say which they wanted. 他们没有说他们想要哪一个。
I am sure (that) no harm will ever come to you. 我肯定你永远不会受伤害。
I was surprised at what has happened.我对发生的事感到惊讶。
注意：当think, believe, suppose等的疑问式后面跟连接代词或连接副词引导的宾语从句时，习惯上将这些连接词置于句首，即“连接代/副词＋do you think /believe /expect＋宾语从句的其余部分？”如：Who do you think is the best player this year? 你认为今年谁是最佳运动员?What do you suppose you will do after school? 你想放学后干什么？(4)同位语从句就是在句中作同位语的从句。
它通常有放在thought, idea, news, word(=news), plan, doubt, question, fact, suggestion, belief等抽象名词的后面，说明这些词的具体内容或含义。
同位语从句大多由that引导，也可由whether, how, when, where, why等引导，但不能由which引导。
如：The idea that the earth is round is not a new one. “地球是圆的”这种观点并不新鲜。
He must answer the question whether he agrees to it or not. 他必须回答他是否同意此事这们一问题。
I have no idea when he will set out. 我不知他什么时候出发。
注：有时，同位语从句并不紧跟在它所说明的词的后面。
如：The whole truth came out at last that he was a wolf in sheep’s clothing. 真相终于大白了，他原来是一只披羊皮的狼。
注意1 语序问题不管什么词引导，从句的语序始终用陈述语序。
如：(1)He asked how he could find his courage. 他问道他如何才能找到他的勇气。
(2)The question is why there is little rain here. 问题是这里为什么雨水少。
注意2 连接词的选用问题A．that，whether，if，as if(限用于表语从句)都不作句子的任何成分。
因此，它们所引导的句子结构必须完整。
that 一般用于确定的语气中，引导宾语从句时，口语中的that可省略，而其他情况中的that一般不可省；而whether，if一般用于不确定的语句中。
如：(1)That he learnt English before is certain. 他学过英语是肯定的。
(2)I don’t know whether / if he will come. 我不知道他是否会来。
(3)He looks as if he knows the answer. 看起来他好像知道答案。
B．whether和if1)whether可用于任何名词性从句中，而一般只能用于宾语从句中。
如果if引导主语从句时，只能放在句中，而不能置于句首。
如：(1)Whether he will come or not doesn’t matter. —It doesn’t matter whether he will come or not. 他来还是不来都没关系。
(2)Do you know if / whether his words are true. 你知道他的话是否真实吗？2)whether可与or not连用，而if则不可以。
如(1)I’m not sure whether / if he can overcome the difficulties. 我没有把握他能否克服这些困难。
(2)The radio didn’t say whether it would rain or not tomorrow. 收音机并没有报道明天是否下雨。
3)若用if会产生歧义时，则用whether。
(1)Let me know whether he will come. 告诉我他是否会来。
(2)Let me know if he will come. 可理解为：告诉我他是否会来。
也可理解为：如果他愿意来，就告诉我一声。
4)whether可与不定式连用，而if不可以。
Have you decided whether to go there tomorrow? 明天是否去那儿，你决定了吗？(句子中的whether不能用if替换)5)whether引导的从句可作某些介词及动词discuss的宾语，而if则不可以。
如：(1)They are talking about whether they will take part in the strike. 他们在谈论他们是否要参加这次罢工。
(2)They are discussing whether they can employ the new way. 他们在讨论他们是否可以采用这种新的方法。
(以上两个句子中的whether 不能用if替换)6)宾语从句若为否定句，连接词则用if 而不用whether。
如：Do you know if he hasn’t been to Washington? 你知道他是否没有去过华盛顿吗？此句子中的If不能用whether替换。
一、词序问题名词性从句总是用陈述句词序，则不能使用疑问句词序，尤其是当名词性从句由“疑问词”引导时，不能受疑问句的影响而误用疑问句词序：误：I didn’t know where did he live.正：I didn’t know where he lived. 我不知道他住哪儿。
误：Who will he marry remains unknown.正：Who he will marry remains unknown. 他同谁结婚还不知道。
二、时态问题由于由when引导的时间状语从句和以if引导的条件状语从句要用现在时表示将来意义，而不能直接使用将来时态，所以许多同学容易受此影响在when和if引导名词性从句时也用现在时表示将来意义。
请看几题：(1) I don’t know if he ________ or not tomorrow.A. comeB. comesC. will comeD. is coming此题答案选C，句中if引导的不是条件状语从句(if≠如果)，而是宾语从句(if＝是否)，句意为“我不知道明天他是否会来。
”(2) I don’t know if she ________, but if she ________ I will let you know.A. comes, comesB. will come, will comeC. comes, will comeD. will come, comes答案选D，第一个if 引导的是宾语从句，第二个if 引导的是条件状语从句。
(3) “When he _____ is not known yet.”“But when he ____, he will be warmly welcomed.”A. comes, comesB. will come, will comeC. comes, will comeD. will come, comes答案选D，第一个when 引导的是主语从句，第二个when引导的是时间状语从句。
另外，当主句为过去时态时，宾语从句通常要用过去的某种时态与之呼应(表客观真理时除外)：The teacher told us that he knew everything. 老师告诉我们他知道一切。
The teacher told us that light travels faster than sound. 老师告诉我们光比声音传播得快。