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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。
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 discovered 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。
名词性从句知识点在英语语法中，名词性从句是一个重要且复杂的部分。
它在句子中起着名词的作用，包括主语从句、宾语从句、表语从句和同位语从句。
接下来，让我们逐一深入了解。
一、主语从句主语从句即在句子中充当主语的从句。
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。
引导主语从句的连接词主要有三类：1、从属连词：that、whetherThat he will come is certain （他会来是肯定的。
）这里的“that”在从句中不充当成分，只起引导作用。
Whether she will go there is not decided （她是否会去那里还没决定。
）“whether”表示“是否”。
2、连接代词：what、who、which、whose、whatever、whichever、whoever 等What you need is more practice （你需要的是更多的练习。
）“what”在从句中充当宾语。
3、连接副词：when、where、why、how 等When the meeting will be held has not been announced （会议何时举行还未宣布。
）需要注意的是，主语从句后置时，常用 it 作形式主语，而将真正的主语从句放在后面。
例如：It is unknown whether he will come （他是否会来还不知道。
）二、宾语从句宾语从句在句中充当宾语。
比如，“I know that he is a student”（我知道他是个学生。
）“that he is a student”就是宾语从句。
引导宾语从句的连接词与主语从句类似：1、从属连词：that（在口语或非正式文体中常省略）、whether、ifHe said （that) he was busyI wonder if/whether he will come2、连接代词：what、who、which、whose、whatever、whichever、whoever 等She asked me what I was doing3、连接副词：when、where、why、how 等Could you tell me how I can get there?宾语从句的时态要根据主句的时态来变化。
名词性从句英语语法知识点汇总名词性从句是在句子中起名词作用的句子。
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。
下面就是小编给大家带来的名词性从句英语语法知识点汇总，希望大家喜欢！引导名词性从句的连接词可分为三类：连接词：that,whether,if 不充当从句的任何成分)连接代词：what, whatever, who, whoever, whom,whose, which.连接副词：when, where, how, why不可省略的连词：1. 介词后的连词2. 引导主语从句和同位语从句的连词不可省略。
That she was chosen made us very happy.We heard the news that our team had won.比较：whether 与 if 均为"是否"的意思。
但在下列情况下，whether 不能被 if 取代：1. whether 引导主语从句并在句首2. 引导表语从句3. whether 从句作介词宾语4. 从句后有"or not"Whether he will come is not clear.大部分连接词引导的主语从句都可以置于句末，用 it 充当形式主语。
It is not important who will go.It is still unknown which team will win the match.1)由从属连词 that 引导的从句叫做名词性 that-从句。
That 只起连接主句和从句的作用，在从句中不担任任何成分，本身也没有词义。
名词性 that- 从句在句中能充当主语、宾语、表语、同位语和形容词宾语，例如：主语：That he is still alive is sheer luck. 他还活着全靠运气。
宾语：John said that he was leaving for London on Wednesday. 约翰说他星期三要到伦敦去。
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。
高考英语一轮复习语法填空专题应对策略专题20 名词性从句学问网络考点考法1.功能1.作主语：主语从句：__________ he has got the scholarship is true.（答案为That）2.作宾语：宾语从句：Mr Li said __________the earth goes around the sun.（答案为that ）3.作表语：表语从句：My idea is __________we should do it right away.（答案为that ）4.作同位语同位语从句：I got the impression __________ you are unhappy.（答案为that）2.四种类型1)主语从句：1.that引导：__________Tom should cheat me is disappointing. （答案为That ）2.whether引导：__________ we’ll have a picnic hasn’t been decided. （答案为Whether）3.连接代词：__________ you need is a good long vacation. （答案为What）4.连接副词：__________ he arrives doesn’t matter. （答案为When）5.形式主语：It happened __________ she was out when we called.（答案为that）It is reported __________ ten people were killed in the explosion.（答案为that）2)宾语从句：1.that引导：He insisted __________ we (should) accept the gifts.（答案为that）2.whether /if引导：I doubt __________ he will come.（答案为whether /if）3.连接副词：She inquired __________ we are getting on. （答案为how）4.连接代词：He did __________ he could to comfort her. （答案为what）5.形式宾语：I find it strange __________ she doesn’t want to travel. （答案为that）I hate it __________ people talk about me behind my back. （答案为when）3)表语从句：1.that引导：The trouble is __________ we are short of money.（答案为that）2.whether引导：The question is __________ you will support me.（答案为whether）3.连接副词：That’s __________ you are wrong. （答案为where）4.连接代词：He is no longer __________ he used to be. （答案为what）5.其他：That’s __________ she spoke French so well. （答案为why）4)同位语从句：1.that引导：There is no doubt __________ he is guilty. (紧跟抽象名词后)（答案为that）The story goes__________ she got promoted.(与名词分开)（答案为that）He gave me some advice __________ I should read English every day.（答案为that）2.whether引导：There is some doubt __________ he will come. （答案为whether）3.连接副词: I have no idea __________ large the physical universe is. （答案为how）4.连接代词：The question __________ will replace him is still not clear.（答案为who）真题回顾语法填空：在空白处填入1个适当的单词。
语法专项复习：名词性从句一、名词性从句的类型：1.主语从句(Subject Clause)：充当句子的主语；置于句首或句末(常用“it”作形式主语)例句：Whether Native Americans arrived in California 15,000 years ago or 14,000 years ago is not important.*从句作主语时，谓语动词一般用单数。
但是what和who引导主语从句时，有时主句的谓语动词的数应与主句中表语的名词保持一致。
例句：1. What they bought was water.2. What they bought were books.“It”作形式主语的句型：1) It is/was +名词( no wonder, an honor, a good thing, a pity, no surprise…)＋主从例句：It is a pity that we can’t go.2) It is/was ＋形容词(obvious, natural, surprising, wonderful, possible, likely,certain…)＋主语从句例句：It is clear that Tom has returned.3) It is/was＋过去分词(said / reported / believed / known / thought / expected /decided / announced / arranged…)＋主语从句例句：It is said that President Jiang will visit our school next week.4) It＋动词(happens /occurs / seems…) ＋主语从句例句：It occurred to him that he failed in the examination.5) It doesn’t matter how/whether…例句：It doesn’t matter whether he is wrong or not.2.宾语从句(Object Clause)：作句子的宾语；位于动词或介词之后。
1.宾语从句，是名词性从句的一种。
在主从复合句中充当宾语，位于及物动词、介词或复合谓语之后的从句称为宾语从句。
宾语从句分为三类：动词的宾语从句，介词的宾语从句和形容词的宾语从句。
2.宾语从句的引导词有三种：(1)以that引导的宾语从句：that引导的宾语从句一般都是由陈述句充当，引导词that没有实际意义，不在从句中作任何成分，that可以省略，而且从句成分齐全，句意完整。
Do you think (that) it will rain? 你认为天会下雨吗?He said (that) he could come on time. 他说他会准时来的。
(2)以whether或if引导的宾语从句：从属连词if,whether引导的名词从句是由一般疑问句或选择疑问句转化而来的，变成从句后，语序由原来的倒装语序变成陈述语序。
whether和if意为“是否”。
Let us know whether / if you can finish the work before Friday.请让我们知道你是否能在星期五以前把工作做完。
I don’t care whether you like the story or not.我不在乎你是否喜欢这个故事。
(3)特殊疑问词what/ when/ where/ who等引导的宾语从句：此类宾语从句原来是特殊疑问句，变成宾语从句后要用陈述语序，由wh-开头的疑问词引导。
包括who, whom, whose, what, which等连接代词和where, when, how,why等连接副词，这些引导词有各自的意思，在从句中要作相应的成分，不能省略。
例如：Could you tell me which gate we have to go to?请问我们得走哪个门?He didn’t tell me how long he would stay here.他没有告诉我他要在这里呆多长时间。
高中英语语法专题名词性从句常见搭配高中英语语法专题名词性从句主语从句宾语从句表语从句同位语从句作及物动词宾语作介词宾语that一般不省略可以省略一般不省略一般不省略一般不省略Whether/if（是否）放于句首时只用whether用whether/if均可，但有区别只用whether只用whether只用whether特殊疑问词注意语序要用陈述语序名词性关系从句注意语序要用陈述语序一、that 从句1、主语从句(1)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(2)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。
语法专题——名词性从句名词性从句的分类Who will win the match is still unknown. 主语从句I want to know what he has told you. 宾语从句The fact is that we have lost the game. 表语从句The news that we won the game is exciting. 同位语从句主语从句在复合句中作主句的主语.引导词有连词that (that不可省),whether; 代词有who, what ,which, whoever, whatever;副词when ,where, how, why 等.如:1.That he is a famous singer is known to us.(It is known to us that he is a famous singer.)2.When he will go to America is not yet fixed.(It is not yet fixed when he will go to America.)3.Whether he will come hasn’t been decided.(It hasn’t been decided whether/if he will come.)连词that, whether在从句中不担任句子成分,只起连接作用,不能省略What you said yesterday is right.That she is still alive surprised me.it 作形式主语和it引导强调句的比较形式主语:◆It is a pity that you didn’t go to see the film.◆It doesn’t interest me whether you succeed or not.强调句:◆It is in the morning that the murder took place.◆It is John that/ who broke the window.宾语从句在复合句中作主句的宾语.引导词有连词that (that 常可省略),whether,if;代词who, whose,what ,which;副词when ,where, how, whyHe has got a pen. I think…I think ( that ) he has got a pen.Where do they study English? Lily asks…Lily asks where they study English.Will you help me? I ask…I ask if you will help me.When will Professor Li give us a talk? We wanted to know …We want to know when Professor Li would give us a talk.Jim is a good student. The teacher said …The teacher said (that) Jim was a good student.Has Mr. Green been in Beijing for five years? He asked …He asked if/whether Mr. Green had been in Beijing for five years.注意: 1. 陈述语序2. 引导词3. 时态与主句时态相对应连接词that不能省略的情况1.agree/ argue/ assure/ hold(认为)/ indicate(指出)/ maintain(主张)/ inform/ object(抗议)/suggest + that2. 主句谓语+宾语从句1+ and + that +宾语从句2I know you aren’t a doctor and that you want your son to become a doctor.否定前置现象:I don’t think he will see you.I don’t believe he will go.We don’t expect he is coming.写出下列句子的反义疑问句I don’t think he can do it, __can he__?He thought you are right, __didn’t he__?表语从句在复合句中作主句的表语.引导词有连词that (that不可省),whether, as if;代词who, what ,which;副词when ,where, how, why 等.The problem is that we didn’t get in touch with him.This is how Henry solved the problem.His suggestion is that we (should) finish the work at once.because 也可引导表语从句。
专题02 名词性从句(期中重点语法)知识串讲一、名词性从句的分类（一）根据从句在句中不同的语法功能，名词性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四种。
（二）根据引导名词性从句的连接词可分为三类：1.连接词：that, whether, if （不充当从句的任何成分）2.连接代词：who, what, which, whose, whoever, whichever, whomever, whatever3.连接副词：where, when, why, how (how much, how long…), wherever, whenever, however二、各个连接词用法及意思。
注：whether与if：只有在及物动词后引导宾语从句，且不与or not 直接连用时，可以互换。
其余的主，宾，表，同位从句中都用whether.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。
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。
