高三英语语法专题(二)名词性从句
高中英语名词性从句知识讲解以及练习题 附答案
高中英语名词性从句知识讲解以及练习题附答案一、名词性从句概述名词性从句是一种充当名词作用的从句，通常在主句中作主语、宾语、表语或同位语。
它通常由引导词（如that, whether, if, who, whom, whose, which, what等）引导，并且从句中含有一个主语和谓语。
名词性从句的种类有很多，包括主语从句、宾语从句、表语从句和同位语从句等。
下面我们将逐一介绍这些从句。
二、主语从句主语从句作为一个名词，通常位于句首，是一个句子，主要作用是作为主句的主语。
引导主语从句的词：What (什么)；Whether (是否)；If (是否)；That (那个)。
例句：What he said is true. (他说的是真的。
)Whether it will rain tomorrow is uncertain. (明天是否会下雨还不确定。
)If you go, I will go too. (如果你走，我也跟着走。
)That he is coming is good news. (他来的消息是好消息。
)注意：主语从句的谓语动词通常要用单数形式。
What引导的主语从句通常用来表示“事物”的概念。
三、宾语从句宾语从句是一个名词，通常位于主句的动词后面，作为主句的宾语。
它可以由常见的宾语从句引导词引导，例如whether, if, that, who, whom, whose, what, when, where, how等。
引导宾语从句的词：Whether (是否)；If (是否)；That (那个)；Who (谁)；Whom (谁)；Whose (谁的)；What (什么)；When (何时)；Where (何处)；How (如何)。
例句：I know that he is coming. (我知道他要来。
)I wonder if he is telling the truth. (我想知道他是否说了真话。
高三语法复习名词性从句(教师版)
高三语法复习第4讲名词性从句名词性从句：主语从句，宾语从句，表语从句，同位语从句名词性从句的引导词可分为引导词1：who,whom, which,what, whatever,whoever,whomever,引导词2：that/ whether ,when, where,why,whose,whenever,wherever,how，however做题方法:首先通过从句所在的未知判断是名词性从句其次分析从句的成分从句中缺主宾表的情况，选择引导词1中的词从句中缺状语或定语，选择引导词2最后，翻译句子，判断逻辑关系引导词的用法1.What引导名词性从句时，要做主语，宾语，表语，要有实际的意义（什么）同样的用法有who，whom,2.that引导名词性从句时，在从句中不充当成分，不可省略，起连接句子的作用3.when，where,why 在从句中充当状语4.whether 的意思是：“是否”，可引导主语从句，不可以换成if 01.主语从句1）从句在主语的位置，也就是从句做主语即为主语从句Eg1. what made me so happy is the good news I received about herEg2.That he wins the first prize in the competition mad me so delighted . Eg3.where I will go hasn’t been decided .Eg4.whether I accept your invitation is up to you.It 做形式主语，真正的主语是从句，常见的句型有It is+ adj(necessary ,important,essential,natural,strange ) that...It is +n(a pity, shame, no wonder) that......It is said /reported/ believed......It seems /appears/matters that.......02宾语从句（在谓语动词后/介词后，一个句子作宾语）Eg1.I didn’t know what he was talking about .Eg2.I always wonder how close the relationship between them.Eg3.I am glad to know that he came back safe and sound .It 做形式宾语主语+ find、make,feel，consider，see to，depend onEg I find it important that we should respect the old people.03表语从句（be动词和系动词之后用句子做表语）Eg1. That is what I want to tell you .Eg2.what confused me is that he should break up with herEg3.By boat is the only way to get here, which is how we arrived.常见的表语从句句型(1)It seems/appears that...(2)This/That is because/why/where/when/how...(3)The question/problem is whether/when/where/how...(4)The suggestion/advice/purpose/aim/goal/dream is that...(5)What从句+be+ that从句例如:What annoyed me most was that he came late again.04同位语从句1）同位语从句的结构：表示内容的先行词+引导词+从句2）同位语从句是对先行词的解释说明3）同位语从句的先行词一般是包含一定内容的抽象名词，如；suggestion、advice、proposal、thought、doubt、belief、news、promise、word、notice、request、requirement，problemEg1. He made a promise to me that he won’t be late for the class once again.4）同位语从句和定语从句的区别定语从句对先行词是起修饰作用，做出限定同位语从句对先行词是解释说明that的用法不同，在定语从句中that是关系代词在从句中做主语宾语表语在同位语从句中，that在从句中不做任何成分Here comes the news that he is admitted to the university.(同位语从句) Here comes the news that I am looking forward to .（定语从句）05wh-ever引导的名词性从句（无论....）1）引导词1：whatever/ whoever/ whomever/whichever（无论哪一个）在从句中做主宾表成分引导词2：whenever/ wherever/however在从句中做状语I can do whatever I want to doWhoever comes to English class late will sing a song for other students2）Wh-ever =no matter wh-Wh-ever 结构可以引导状语从句和名词性从句No matter wh-只能引导状语从句3）wh-和wh-ever 的区别wh-ever 译为无论.....，没有范围和条件wh-指特定的人，事情，地点等Eg1. Who is the next one to answer the question?Whoever answers the question can get a candy .Exercise 11.(2024·天津河西区模拟)_______ I’m concerned about most is_______we can collect a huge amount of money in such a short time. A.That; how B.What; if C.What; how D.As; whether【解析】选C。
高考英语语法名词性从句讲解及练习
语法复习之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，名词性从句厅分为主语从句、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1、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。
3、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（好象）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1、主语从句在复合句作主语。
e.g. Who will go is not important.2、用it作形式主语，主语从句放在句末。
e.g. It doesn’t matter so much whether you will come or not.3、that引导主语从句时，不能省略。
e.g. That he suddenly fell ill last week made us surprised.（三）表语从句1、表语从句在复合句中作表语，位于系动词之后。
e.g. The question was who could go there.2、引导表语从句的连接词that有时可省去。
e.g. My idea is (that) we can get more comrades to help in the work.（四）宾语从句1、宾语从句在复合句中作宾语。
高考英语语法知识点：名词性从句
高考英语语法知识点：名词性从句1500字名词性从句是指在句子中充当名词的成分的从句。
名词性从句分为主语从句、宾语从句、表语从句和同位语从句。
在高考英语中，名词性从句是考查的重点之一，我们需要对名词性从句的结构和用法有透彻的理解。
下面是关于名词性从句的一些重要知识点：1.主语从句主语从句在句中充当主语的作用。
主语从句通常以that引导，也可以用whether或if 引导。
例如：- That he is guilty is certain.- Whether we will win the game is yet to be seen.- If it will rain tomorrow is still uncertain.2.宾语从句宾语从句在句中充当宾语的作用。
宾语从句通常以that引导，也可以用whether或if 引导。
需要注意的是，当主句的动词是说、tell、ask、think、believe、know等表示说话、思考、感觉的动词时，常用连词that引导宾语从句，但如果宾语从句的主语与主句的主语相同，可以省略连词that。
例如：- I know that he is a good student.- She asked me if/whether I had finished my homework.- He told her (that) he loved her.3.表语从句表语从句在句中充当表语的作用。
表语从句通常以that引导，也可以用whether或if 引导。
例如：- The fact that he didn't come is disappointing.- The question is whether we should proceed with the plan.- My concern is if/whether we have enough time.4.同位语从句同位语从句用来解释或说明前面名词的具体内容或意义。
高考英语语法专题精讲精练-名词性从句
语法专题二：名词性从句1. 名词性从句的基本概念：1) 主语从句：在句中充当主语；亦可用it作形式主语，主语从句置于句末。
2) 宾语从句：在句中充当及物动词或介词的宾语；亦可用it作形式宾语，宾语从句置于句末。
3) 表语从句：在句中充当系动词的表语。
4) 同位语从句：常置于fact, idea, news, promise, doubt, suggestion, possibility, belief等表示有内容的名词后，起解释、说明作用。
2. 注意：1) 名词性从句要用陈述句语序。
2) 名词性从句中缺少主语、表语、宾语时：常用what 导，亦可用which表示选择，用who/whom/whoever指人。
缺少状语：用where（表地点）, when（表时间）, how（表方式）, why（表原因）。
3) 如不缺成份：主语从句、同位语从句用that引导，不能省略；表从、单个动词宾从可省略引导词that；介词宾从、第二个宾从，引导词that一般不省略；it作形式主语或宾语时，引导实际主从或宾从，一般that不省略；当主从、宾从本身为复合句时，引导词that不省略。
如：He told us sadly that what he had done secretly was dis covered by his parents.4) 含宾从的复合句中，主句和从句的时态保持一致，但如果从句中表示是客观现象，虽然主句是过去时态，从句仍用一般现在时。
5) 主语从句做主语，谓语动词用单数；如果由and 连接两个或两个以上的主语从句做主语时，谓语动词用复数；由两个或多个连接词引导一个主语从句，谓语动词用单数。
6) 当主句是I/We think（或suppose, expect, believe, imagine, guess）时，其后的宾语从句如果是否定的，常常把否定词not从从句中移到主句中。
7) 只能用whether，不能用if表示“是否”的情况如下：(1) 在表语从句和同位语从句中；(2) 在主语从句中，如果用it做形式主语，whether和if都能引导主语从句，否则，只能用whether(3) 在介词之后；(4) 后面直接跟动词不定式；(5) 与or not连用；(6) 引导让步状语从句，只能用whether。
2023年高中英语语法：名词性从句用法详解及强化练习分析
2023年高中英语语法：名词性从句用法详解及强化练习分析名词性从句分类简述名词性从句，就是指其作用相当于名词的从句，它包括主语从句、表语从句、宾语从句和同位语从句。
一、主语从句1. 引导词：主语从句就是在复合句中用作主语的从句，引导主语从句的引导词主要有三类：一是that;二是whether;三是那些可以用作疑问词的词语，如what, who, which, when, where, how, why 等。
如：That we shall be late is certain. 我们要晚了，这是确定无疑的。
What he says is not important. 他说的话并不重要。
Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
2. 形式主语：有时为了避免句子显得“头重脚轻”，可用it作形式主语放在句首，而把真正的主语放在句末。
如：It’s a pity that he didn’t come. 很遗憾他没来。
It was uncertain whether he could come or not. 他是否会来还不肯定。
这三句句首的it均为形式主语，相应的真主语分别是that he didn’t come / what she did / whether he could come or not。
二、表语从句表语从句就是在复合句中用作表语的从句。
一般说来，可用于引导主语从句的引导词也可用于引导表语从句，如that, what, who, which, when, where, how, why, whether等。
如：My idea is that we should do it right away. 我的意见是马上就干。
That is what he meant. 这就是他的意思。
The problem is how we can find him. 问题是我们如何找到他。
高中英语高考名词性从句专项复习(知识点+易错点+练习题)
高考英语名词性从句知识点一、that从句1、主语从句that从句作主语时，常用it作形式主语，常见的句型有：It+be+形容词(obvious, true, natural, surprising, good, wonderful, funny, possible, likely, certain, probable, etc. ) + that 从句It+be+名词词组(no wonder, an honor, a good thing, a pity, no surprise, etc. ) + that 从句It+be+过去分词(said, reported, thought, expected, decided, announced, arranged,etc. ) + that 从句that可以省略，但that从句位于句首时，that不能省略。
2、宾语从句(1)常见的可以接that从句作宾语的动词有see, say, know, imagine, discover, believe, tell, show, think, consider, be sure, be afraid 等。
在可以接复合宾语的动词之后,如think, make, consider等，可以用it作形式宾语。
(2)That从句一般不能充当介词宾语，偶尔可作except, in的宾语。
3、表语从句(that不可省略)4、同位语从句连词that引导同位语从句时，应在某些抽象名词之后,如：fact, hope, desire, thought, suggestion, idea, news, problem, possibility 等，对前面的名词起补充说明的作用，that 在从句中不担当任何成分，不能省略。
二、whether/if 从句1＞在表语从句和同位语从句中，只能用whether不能用if；当主语从句放于句首时，只能用whether不用if；当it作形式主语，主语从句放在句末时用whether或if均可；discuss后引导宾语从句时，必须用whether。
高中英语知识点归纳名词性从句
高中英语知识点归纳名词性从句名词性从句是英语中的一个重要语法知识点，它在句子中起着名词的作用。
名词性从句一般由连接词引导，可以作主语、表语、宾语、同位语等。
它的运用能够使句子更加丰富多样，增加表达的灵活性。
本文将对名词性从句的几种常见情况进行归纳总结。
一、名词性从句作主语名词性从句可以作为句子的主语，它承担了动词的逻辑主语的地位。
常用的连接词有：that, whether, if等。
1. 引导词为that的情况：例如：That he didn't come as he had promised was disappointing.翻译：他没有按照承诺的那样来，真令人失望。
2. 引导词为whether/if的情况：例如：Whether he will come or not remains unknown.翻译：他是否会来还是个未知数。
二、名词性从句作表语名词性从句可以作为句子的表语，表达主语的性质、特点、状态等。
常用的连接词有：that, whether, what等。
例如：It is unclear whether he is telling the truth or not.翻译：他是否在说真话还不清楚。
三、名词性从句作宾语名词性从句可以作为句子的宾语，接在及物动词、介词后面。
常用的连接词有：that, whether, if, what, who, whom, which, whose等。
1. 当宾语从句是及物动词的宾语时，常用连接词是that。
例如：He said that he would come tomorrow.翻译：他说他明天会来。
2. 当宾语从句是介词的宾语时，常用连接词是whether/if, 当介词为介词to时，连接词也可以用为不定式to。
例如：She is not sure about whether/if he will join us.翻译：她不确定他是否会加入我们。
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。
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.
(word完整版)高中英语语法总结-名词性从句(2),推荐文档
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。
高考英语语法知识清单：专题02 名词性从句八大考点归纳(讲义) +外刊原创语法填空(原卷版)
专题02 名词性从句八大考点归纳（讲义）原卷版养成良好的答题习惯，是决定高考英语成败的决定性因素之一。
做题前，要认真阅读题目要求、题干和选项，并对答案内容作出合理预测;答题时，切忌跟着感觉走，最好按照题目序号来做，不会的或存在疑问的，要做好标记，要善于发现，找到题目的题眼所在，规范答题，书写工整;答题完毕时，要认真检查，查漏补缺，纠正错误。
总之，在最后的复习阶段，学生们不要加大练习量。
在这个时候，学生要尽快找到适合自己的答题方式，最重要的是以平常心去面对考试。
英语最后的复习要树立信心，考试的时候遇到难题要想“别人也难”，遇到容易的则要想“细心审题”。
越到最后，考生越要回归基础，单词最好再梳理一遍，这样有利于提高阅读理解的效率。
另附高考复习方法和考前30天冲刺复习方法。
讲义目录考点清单一、that和what典型用法归纳P2 考点清单二、连词if和whether典型用法归纳P2 考点清单三、what和how引导的宾语从句的典型用法P3 考点清单四、wh- ever类从句典型用法归纳P3 考点清单五、两种典型的同位语从句归纳P3 考点清单六、it作形式主语/宾语的名词性从句P4 考点清单七、名词性从句中虚拟语气用法P4 考点清单八、名词性从句中的时态照应P5 分类训练（一）高考真题P6 分类训练（二）模拟试题P6 分类训练（三）单句改错P7分类训练（四）句式升级（书面表达真题）P7 分类训练（五）外刊原创语法填空P8 （一）二十四节气之大暑来历及风俗P8 （二）传统茶与咖啡混合饮料成为新时尚P8 （三）中国新能源汽车正在进入德国汽车市场P9考点清单一、that和what典型用法归纳要点精讲：①that是连词，只起连接作用，不作句子成分。
②what是连接代词，既起连接作用，又充当句子主语、宾语、定语、表语等。
③特别注意what的替代功能，相当于the thing/time/place/speed that…。
高中英语语法——名词性从句_2
表语 同位语
名词性从句的定义及种类 1. 定义: 在句子中起名词作用的各种从句，统称为名词性从句。 2. 种类: 根据它们在句中所充当的句子成分，可以分为主语从 句、宾语从句、表语从句和同位语从句。
请判断以下哪几句为名词性从句
1.Whether we will go for an outing tomorrow remains unknown. 主语从句 2.The question is when he can arrive at the hotel. 表语从句 3.It was Mary that helped me solve the problem. 强调句 4.Whoever breaks the law will be punished. 主语从句
1. 从属连词: that, if, whether
that: 无词义、不充当从句中的成分，引导第一个宾语从句可省略。 if: 表是否，不充当从句中的成分，引导宾语从句，不可省略。 whether: 表是否，不充当从句中的成分，引导名词性从句，不可省略。
1.__T_h__a_t __we will realize our dreams in the future is certain. 2.The fact is __t_h_a_t_ the Earth goes around the Sun. 3.__W__h_e_t_h_e_rshe will come back on time depends on weather. 4.I asked him __i_f/__w_h_e_t_h_e_r he could do me a favor. 5.Could you tell me the question _w__h_e_t_h_e_r English is useful for us now? 6.Word came ___t_h_a_t_ his son was admitted to Beijing University. 7.The christian Church rejected his theory, saying ___(_th_a_t_)__ it was against God's idea and ___t_h_a_t_ people who supported it would be attacked.
超实用高考英语复习：名词性从句
• Everyone knew what happened and that she was worried. • I think it necessary that you should read English aloud.
Noun Clauses
Learning Aims
知道名词性从句的分类，能识别出各个从句 熟练使用名词性从句的引导词，把握高考考点
指出名词在句子中的作用
1.The world loves nature.
主语
宾语
2.Knowledge is power .
主语
表语
3.We Chinese are peace-loving.
宾从
2. She wondered if the buses would still be running. 宾从
3. The truth is that the fog is too thick for the bus to run that far.
表从
4. When we will start is not clear.
主语从句 宾语从句 介词后的宾从
表语从句 同位语从句
Practice time：指出下列各名词性从句的种类
1. At lunchtime, the radio weatherman reported that the mist would become a thick fog in the afternoon.
❖I don’t know what happened . ❖May I ask what your plans are.
专题02 名词性从句(讲解)-备考2021年高考英语语法分类讲解+十年真题解析
名词性从句1.定义起名词性作用的从句，叫名词性从句。
换言之，本来该由名词充当的主语、宾语、表语和同位语部分，换由一个句子来充当，这样的句子就是名词性从句。
主语从句His job is important (What he does) is important.宾语从句I like his job. I like (what he does every day).表语从句This is his job. This is (what he does every day).同位语从句I know Tom, our monitor. I know the fact (that Lucy is married).2.分类名词性从句包括四大从句：主语从句，宾语从句，表语从句和同位语从句。
3.结构（常见）主语从句：(连接词引导的句子)+谓语+（宾语）宾语从句：主语+谓语+(连接词引导的句子)或者介词+（连接词引导的句子）表语从句：主语+系动词+（连接词引导的句子）同位语从句：抽象名词+（连接词引导的句子）4.起止点起点:1）通常是从连接词开始。
2）连接词that省略时，从第二个主语开始。
名词性从句的止点止点:1）通常是连接词词后面的标点符号。
2）连接词后面的第二个谓语动词前。
I believe I can fly.My idea is that we should do it right now.Whether she will come back on time depends on weather .I knew the news that our team won the match.Who will go to the college is still uncertain.They agree with what I said just now .宾语从句3. 宾语从句概念从句在主句中作宾语4.宾语从句的分类1）动词后宾语从句结构：①及物动词+宾语从句②及物动词+宾语1+宾语从句I know that well begun is half done .He promised us that he would offer us more assists later on.He has informed me when he is to solve the problem.注:谓语动词通常为接双宾语的及物动词,如tell, give, inform等,结构通常为v.+ sb. + sth.考查形式为：“v. +( v.+其它)”All of us have already known she will choose is the opportunity to go abroad2）介词后宾语从句结构：介词+宾语从句We are not interested in whether you will agree with us about who will win the game.When you are reading, make a note of what you think is of great importance.注: 在介词后的宾语从句中，连接词that不可以省略。
高三语法复习-名词性从句
引导名词性从句的关联词
1
在名词性从句中一律用陈述句的语序，即使从句表达的是疑问含义。
2
The problem is what he has done to the little boy.
3
问题是他对那个小男孩做了些什么。
在句中作主语的句子叫主语从句。
主语从句通常由从属连词that，whether 和连接代词what, who, which, whatever, whoever以及连接副词how,when,where, why等词引导。
2）It + be + 形容词(obvious, true, natural, surprsing , possible, likely, certain, probable, etc.+ that从句 It is certain that she will do well in her exam. It is probable that he told her everything. 3）It + be + 动词的过去分词 (said, reported, supposed, expected, announced,suggested, proposed , desired , etc. ) + that从句 It is said that Mr. Green has arrived in Beijing. It is decided that the meeting has been put off till next Monday.
Everything depends on whether we have enough money.
I don’t care about whether you have money or not. /whether or not you have money . 介词后的宾语从句一般不用which和if引导，要用whether和what。that也很少引导介词宾语从句，只在except, but, in等之后才用。
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高三英语语法专题（二）名词性从句在英语中，通常把主语从句、表语从句、同位语从句和宾语从句统称为名词性从句。
名词性从句在句中相当于一个名词或名词词组，在句中充当主语、表语、宾语或同位语等。
引导名词性从句的词通常分为三类:①连接词有that/whether/if等;②连接代词有what/ who / which/ whatever / whoever / whichever / whom / whomever 等;③连接副词有when / where / why / how等，名词性从句中缺少什么成分就找什么引导词，如果不缺少成分通常用that来引导。
一．主语从句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。
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。
被强调部分指人时也可用who/whom。
例如：It is a pity that you didn‟t go to see the film.It doesn‟t interest me whether you succeed or not.It is in the morning that the murder took place.It is John that broke the window.2. 用it 作形式主语的结构(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It is a pity that…可惜的是……(2) It is ＋形容词＋从句It is natural that…很自然……It is strange that…奇怪的是……It is certain that… 很肯定(3) It＋连系动词或不及物动词＋从句It seems that…似乎……It happened that…碰巧……(4) It is＋过去分词＋从句It is reported that…据报道……It has been proved that…已证实……3. 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。
(2) It is said , (reported) …结构中的主语从句不可提前。
例如：It is said that President Jingo will visit our school next week. (right)That President Jiang will visit our school next week is said. (wrong)(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. (right)That he failed in the examination occurred to him. (wrong)(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 whether he is wrong or not. (right)Whether he is wrong or not doesn‟t matter. (wrong)(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? (right)Is that will rain in the evening likely? (wrong)4. 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 则不然。
1) What you said yesterday is right.2) That she is still alive is a surprise to all of us.二．宾语从句宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词（及物动词）或介词之后。
1. 作动词的宾语由that引导的宾语从句（that 通常可以省略）,例如：I heard that he joined the army.注意：在insist, order, demand, require, suggest, advise等表示坚持、命令、要求、建议等意义的动词后，that从句常用“（should）+ 动词原形”的结构（虚拟语气）。
2. 作介词的宾语Our success depends upon how well we can cooperate with one another.3. 作形容词的宾语I am afraid (that) I‟ve made a mistake.I am confident that I can get the job.that 引导的从句常跟在下列形容词后作宾语：anxious, aware, certain, confident, convinced, determined, glad, proud, surprised, worried, sorry, thankful, ashamed, disappointed, annoyed, pleased, hurt, satisfied, content 等;也可以将此类词后的that从句看作原因状语从句。
4. It 可以作为形式宾语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。
I think it necessary that we read English every day.用于此句型常见的动词和短语:appreciate, like, dislike, hate, love, count on/upon(期待), depend on/upon (依靠),rely on (指望), see to (确保), insist on, take…f or granted（相当然）, bring…to one‟s attention等Please see to it that the door is locked before you leave.I don‟t like it that people speak with their mouthes full.You may rely on it that everything will be ready by Monday.5. 否定的转移若主语为I/we think/consider/ suppose/ believe/expect/guess/imagine等，其后的宾语从句若含有否定意义，一般要把否定词转移到主句谓语上，从句谓语用肯定式。
例如：I don‟t think this dress fits you well.（我认为这件衣服不适合你穿。
）三．表语从句表语从句是在复合句中作表语的名词性从句，放在系动词之后，一般结构是“主语＋连系动词＋表语从句”。
可以接表语从句的连系动词有be, look, remain, seem等。
1) The question is whether we can make good preparations in such a short time.2) This is why we can‟t get the support of the people.3) The fact remains that we are behind the other classes.4) The reason why he is late for school is that he missed the early bus.四．同位语从句同位语从句就是在复合句中作名词的同位语的名词性从句。
它对前面的名词作进一步解释，说明名词的具体内容，一般由that引导，例如：1) The king‟s decision that the prisoner would be set free surprised all the people.2) The order that all the soldiers should stay still is given by the general.同位语从句有时可以不紧跟在它所说明的名词后面，而是被别的词隔开。
例如：He got the news from Mary that the sports meeting was put off.五、名词性从句考点扫描：考点一:一些引导词的使用★that引导主语从句、表语从句、同位语从句时，只起连接主从句的作用而不充当句子的任何成分，此时that不可以省略; that引导宾语从句时，不充当成分，往往可以省略，但以下几种情况一般不省略:①在句型"主语+谓语+it(形式宾语)+ 补足语+that从句"中，that不可以省略。
如:The manager has made it clear to us that he doesn't agree with us.②当由两个that引导的从句作同一个动词或介词的宾语时，第二个从句中的that不能省略。
如: Mr Smith told the workers (that) John had worked very hard and that he wanted him to stay.③当宾语从句是由主从复合句充当并且从句在前时，that一般不省略. 如: She says that if her father allows her to join us，she will come here on time.④有插入语或其它成分把宾语从句和主句分开时。
如: She explained to me that she was not wrong.⑤当that引导的宾语从句的主语是非谓语动词或主语从句时。
如:He explained that what she was looking for was a pair of socks.⑥当从句的主语是that时。