th语法专题名词性从句
高中英语知识点归纳名词性从句的特殊用法与考点
高中英语知识点归纳名词性从句的特殊用法与考点高中英语知识点归纳：名词性从句的特殊用法与考点介绍：名词性从句是英语中的一个重要语法要点，它作为一个句子的成分在句中起到名词的作用。
名词性从句的特殊用法及考点在高中的英语学习中经常出现，掌握这些知识点对于提高学生的语言表达能力和理解能力至关重要。
一、名词性从句的特殊用法：1. 作主语：名词性从句可以作为主语出现在句子中，常常使用的引导词是“that”或者是连接代词“wh-”引导的从句。
例如：（1）That he is coming is good news.（2）Whether we will go camping is still undecided.2. 作宾语：名词性从句可以作为及物动词的宾语出现在句子中，常使用的引导词有“that”和连接代词“wh-”。
例如：（1）I believe that you can do it.（2）He asked me how to solve the problem.3. 作表语：名词性从句可以作为句子的表语出现，通常使用引导词“that”或者是连接代词“wh-”。
例如：（1）The truth is that she loves you.（2）The question is whether we should trust him or not.4. 作补语：名词性从句可以作为一些特定动词的补语出现在句子中，常用的引导词有“that”和连接代词“wh-”。
例如：（1）I consider it necessary that we take action.（2）We all hope that he can win the game.5. 作定语：名词性从句可以作为定语修饰一个名词或代词，通常使用的引导词是连接代词“wh-”。
例如：（1）I have no idea which book to choose.（2）The person who told me the news is my best friend.二、名词性从句的考点：1. 名词性从句的语序：名词性从句的语序要遵循主从结构，通常是由从句引导词引导，跟在主句之后。
高中英语语法：名词性从句知识汇总
高中英语语法：名词性从句知识汇总在复合句中具有名词的性质的作主语、表语、同位语、宾语的从句叫名词性从句。
因此，我们把主语从句、表语从句、同位语从句和宾语从句这四种从句统称为名词性从句。
当名词性从句要采用陈述句语序。
由一个含疑问意义的连词引起时，必须将该连词放在名词性从句的开头，且该从句语序不能倒装。
一、引导名词性从句的关联词引导名词性从句的关联词大致相同，它们分别是：连词：that, whether, if；关系代词：who, what, which , whom, whose, whatever, whoever, whomever, whichever；关系副词：when, where, how, why, however, whenever, wherever。
引导从句时一般不用逗号和主句分开。
连词that在从句中不作成分，不含疑问意义；而wh-连词在从句中作成分，且含有疑问意义；或what/where从句相当于一个名词后加一个定语从句。
It worried her a bit that her hair was turning grey.她的头发在变白令她有点担忧。
（that在从句中只起引导词作用，不作成分）What caused the accident is still a complete mystery.事故发生的原因仍然是个不解之谜。
（What在从句中作主语）2、that与whether引导名词性从句的区别。
（1）动词doubt表示“怀疑、不知道”解时，肯定句接whether引导的宾语从句；否定句don’t doubt和疑问句Do you doubt要接that引导的从句。
I don’t doubt that he will come soon.我不怀疑他不久会来。
（此处不用whether）Can you doubt that he will win?你怀疑他会赢吗？（此处不用whether）比较：doubt表示“不信”解时，表示强烈的不相信时，在陈述句中可接that从句。
2020高考英语语法专题汇总(三)：名词性从句
2020高考英语语法专题汇总（三）：名词性从句在复合句中起名词作用的从句叫作名词性从句。
种类主语从句、宾语从句、表语从句和同位语从句。
注：由于名词性从句在句中不同的句法功能（即名词性从句在复合句中，能充当主语、宾语、表语、同位语等。
），相应地，名词性从句可以分为主语从句、宾语从句、表语从句和同位语从句。
引导词主语从句主语从句可直接放在句首，也可用形式主语it代替，而将主语从句后置。
that引导的主语从句1)that引导的主语从句置于句首（that此时在从句中不充当任何成分，无含义，只起连接作用，不能省略）That the earth moves around the sun is known to all.注：从句作主语，谓语动词用单数形式。
2)在that引导的主语从句中，常用it作形式主语，that引导的真正的主语从句后置，常见的此类句型有：①It+系动词+形容词+that从句。
常用于这种结构的形容词有：It is likely that he can’t come to the meeting.It is obvious that you have made a big mistake.注：It is necessary/important/surprising/strange/unthinkable/unbelievable/incredible that+主语(should)+动词原形+其它。
e.g. It is necessary that a college student (should) master one or two foreign languages.It is strange that you (should) trust Jane.②It+系动词+名词+that从句。
It is a pity that you did n’t attend the lecture yesterday.It is no wonder that you’ve achieved so much success.③It+ be+过去分词+that从句。
th语法专题 名词性从句
语法专题名词性从句(Noun Clauses) 1.概念在句子中起名词作用的句子叫名词性从句。
2. 种类1) 主语从句:主语从句+ 谓语动词+ 其他2) 表语从句:主语+ 系动词+ 表语从句3) 宾语从句:及物动词/介词+ 宾语从句4) 同位语从句:名词/代词+ 同位语从句例句展示◆That they will win the game is certain. →It is certain that they will win the game.◆Whether the task can be finished on time is still unknown.→It is still unknown whether the task can be finished on time.◆Why he didn’t come here is not clear to anyone.→It is not clear to anyone why he didn’t come here.◆Whoever breaks the law should be punished.◆What he said at the meeting is important.例句展示★Can you tell me when and how I can get to the city?★I don’t understand what he means.★I am not sure whether he would help me.★He said that he had visited his former English teacher several times.例句展示◆It is still a question whether the bridge can be completed next month.◆When she heard the news that the earthquake happened in her hometown, she lost consciousness.◆They have no idea whether they should go on with the search.◆The question who can go to the meeting hasn’t been decided.名从考点：1. what和that_____he can’t finish the work on time is ____makes us worry. (KEY:That，what) 注：what在从句中作主语、宾语、表语等。
高考英语名词性从句语法知识点讲解
高考英语名词性从句语法知识点讲解高考英语名词性从句语法学问点讲解名词性从句指充当名词成分的从句，下分许多类型，是英语学习的重点，详细都有哪些学问点呢?我整理了相关资料，盼望能关心到您。
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，但有区分只用whether只用whether只用whether特别疑问词留意语序要用陈述语序名词性关系从句留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,pro bable,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，间或可作except, in 的宾语。
英语语法：名词性从句最详分析
英语语法：名词性从句最详分析英语语法:名词性从句最详分析名词性从句是由if, whether, that 和各种疑问词充当连接词所引导的从句，其功同名词一样。
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。
被强调部分指人是也可用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(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…(4) it +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。
名词性从句英语语法知识点汇总
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
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。
名词性从句的语法解析
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。
高中英语知识点归纳名词性从句的用法
高中英语知识点归纳名词性从句的用法名词性从句是英语中一个重要的语法结构，它可以在句子中充当名词的作用。
名词性从句可以作主语、宾语、表语和同位语等，它的引导词有很多种，比如that, whether, who, whom, whose, which, what, when, where等。
本文将对名词性从句的用法进行归纳总结。
1. 名词性从句作主语名词性从句作主语时，常用it代替整个从句，并将从句放在句子的后面。
例如：It is important that we learn English well.（我们学好英语很重要。
）2. 名词性从句作宾语名词性从句作宾语时，常与一些动词或介词搭配使用。
例如：I believe that he will come.（我相信他会来。
）She is not sure whether he likes her or not.（她不确定他是否喜欢她。
）They asked me what time the train would leave.（他们问我火车什么时候开。
）3. 名词性从句作表语名词性从句作表语时，常用it代替整个从句，并将从句放在句子的后面。
例如：The important thing is that we try our best.（重要的是我们尽力。
）4. 名词性从句作同位语名词性从句作同位语时，修饰前面的名词，起进一步说明或解释的作用。
例如：The fact that he lied surprised me.（他撒谎的事实使我吃惊。
）除了以上几种常见的使用方式，名词性从句还有一些特殊的用法。
5. 名词性从句与疑问词连用名词性从句与疑问词连用时，疑问词可以是关系代词或关系副词，例如：I don't know who will come.（我不知道谁会来。
）Please tell me where you were last night.（请告诉我你昨晚在哪里。
语法中的名词性从句的引导词和用法总结
语法中的名词性从句的引导词和用法总结引言语法中的名词性从句是句子中扮演名词角色的从句，在英语中起到非常重要的作用。
名词性从句的引导词多种多样，每个引导词都有其独特的用法和语境。
本文将对名词性从句的引导词和用法进行总结和归纳，帮助读者更好地理解和运用。
一、引导名词性从句的主要词语1. that2. whether/if3. wh-疑问词（what, when, where, who, which, why, how等）4. 连接副词（where, when, why等）二、that引导的名词性从句1. 作主语例句：That she is successful makes me happy.2. 作宾语例句：I believe that he is telling the truth.3. 作表语/同位语例句：The fact that he won the competition surprised everyone.三、whether/if引导的名词性从句1. 作主语例句：Whether the weather will be fine tomorrow is still uncertain.2. 作宾语例句：She hasn't decided whether she will go to the party or not. 3. 作表语例句：The question is whether we should support this project.四、wh-疑问词引导的名词性从句1. whata) 作主语例句：What he said is worth considering.b) 作宾语例句：I don't know what she wants.c) 作表语例句：His suggestion is what I agree with.2. whena) 作主语例句：When we will meet again is still uncertain.例句：I can't remember exactly when she arrived.c) 作表语例句：The important thing is when we can finish this project.3. wherea) 作主语例句：Where we will go for the summer vacation hasn't been decided yet.b) 作宾语例句：She can't remember where she left her keys.c) 作表语例句：The key to success lies in where you choose to invest your time and efforts.4. whoa) 作主语例句：Who will win the game is still unknown.b) 作宾语例句：I don't know who she is talking to.例句：The question is who should be responsible for this problem.5. whicha) 作主语例句：Which one of the books is worth reading?b) 作宾语例句：I can't decide which dress I should wear to the party.c) 作表语例句：The difficulty lies in which method we should choose.6. whya) 作主语例句：Why he did that remains a mystery.b) 作宾语例句：I don't understand why he refused the offer.c) 作表语例句：The reason why she quit her job is still unclear.7. howa) 作主语例句：How we will solve this problem is yet to be determined.b) 作宾语例句：I'm not sure how she managed to finish the task so quickly.c) 作表语例句：The key to success lies in how you adapt to changes.五、连接副词引导的名词性从句1. wherea) 作主语例句：Where we will go for dinner tonight is still undecided.b) 作宾语例句：I can't remember where she placed the documents.c) 作表语例句：The question is where we can find the best coffee in town.2. whena) 作主语例句：When we will have a meeting depends on everyone's availability.b) 作宾语例句：I can't remember when we last met.c) 作表语例句：The important thing is when we can start the project.结论通过对名词性从句的引导词和用法进行总结，我们可以清楚地了解不同引导词在不同句子中的作用和意义。
英语语法名词性从句知识点总结
英语语法名词性从句知识点总结 名词性从句即指性质相当于名词的从句，是英语语法中⽐较难的从句。
以下是由店铺整理关于英语语法名词性从句知识点的内容，希望⼤家喜欢! 英语语法名词性从句知识点(⼀) 当名词后⾯所接的从句表⽰与名词同位并为名词的实际内容时，这个从句就是同位语从句。
如： The news that China has joined the WTO excite us all. 中国加⼊了世界贸易组织这⼀消息使我们⼤家兴奋不已。
He told us the truth that he fell down from his bike this afternoon. 他告诉了我们他从单车上摔下来这⼀真相。
同位语中应注意： 1. ⾼中所学能带同位语从句的名词不多，常见的有：answer, belief, conclusion, decision, discovery, doubt, explanation, fact, hope, idea, information, knowledge, law, message, news, opinion, order, possibility, problem, promise, proof, proposal, question, report, risk, rumor, story, suggestion, truth, theory, thought, wish, word等。
如： Hw sent us a message that he won’t come next week. 他送信来告诉我们说，下周他不来了。
There is no doubt that he is fit for this job. 毫⽆疑问，它适合这⼀⼯作。
2. 表⽰“命令、建议、要求” advice, demand, decision, desire, idea, insistence, instruction, order, plan, proposal, recommendation, request, requirement, suggestion, wish 等名词的同位语，须⽤虚拟语⽓。
初中英语知识点归纳名词性从句的特殊结构总结
初中英语知识点归纳名词性从句的特殊结构总结名词性从句是英语中的一个重要语法概念，它在句子中扮演名词的角色。
它可以充当主语、宾语、表语等，起到连接主句和从句的作用。
在名词性从句的特殊结构中，有一些需要注意的规则和用法。
本文将对初中英语中名词性从句的特殊结构进行总结。
1. 特殊疑问词引导的名词性从句特殊疑问词有：what, who, whom, whose, which, when, where, why, how等，它们可以引导名词性从句。
例如：- What she said is true.（她说的是真的。
）- Who will go with me is still unknown.（谁会和我一起去还不知道。
）- Can you tell me where he lives?（你能告诉我他住在哪儿吗？）2. "if"引导的名词性从句"if"在特定情况下可以引导名词性从句，表示条件或假设。
例如：- I don't know if he will come to the party.（我不知道他是否会来参加派对。
）- We will go to the park if it doesn't rain.（如果不下雨，我们会去公园。
）3. "whether"引导的名词性从句"whether"用来引导名词性从句，表示两个或多个选择之间的关系。
例如：- I'm not sure whether he will come or not.（我不确定他是否会来。
）- She hasn't decided whether to study abroad or to stay in her hometown.（她还没有决定是出国留学还是留在家乡。
）4. "that"引导的名词性从句在口语和书面语中，有时可以用"that"来引导名词性从句，作为连接词。
高中英语知识点归纳名词性从句的引导词和句型
高中英语知识点归纳名词性从句的引导词和句型高中英语知识点归纳：名词性从句的引导词和句型名词性从句是英语语法中的重要部分，常用于句子中作为名词的成分。
名词性从句由引导词和从句组成，可以充当主语、宾语、表语或同位语等。
本文将归纳总结高中英语中常见的名词性从句的引导词和句型。
一、引导名词性从句的关系代词1. 关系代词“that”关系代词“that”可以引导名词性从句，在句中可以充当主语、宾语或其他成分。
例句1：I believe that knowledge is power.（我相信知识就是力量。
）（主语从句）例句2：He told me that he would come tomorrow.（他告诉我他明天会来。
）（宾语从句）2. 关系代词“who/whom”关系代词“who”用于指人的名词性从句中，可充当主语、宾语或其他成分。
当在从句中作宾语时，它的宾格形式是“whom”。
例句1：She is the girl who won the singing competition.（她是那个赢得唱歌比赛的女孩。
）（主语从句）例句2：I talked to the girl whom you met yesterday.（我和你昨天见过的那个女孩交谈过。
）（宾语从句）3. 关系代词“which”关系代词“which”用于指物的名词性从句中，可充当主语、宾语或其他成分。
例句1：This is the book which I bought yesterday.（这是我昨天买的那本书。
）（主语从句）例句2：I lost the key which you gave me.（我丢了你给我的那把钥匙。
）（宾语从句）4. 关系代词“whose”关系代词“whose”用于指人或事物的所有关系，常用于名词性从句中，通常充当定语。
例句1：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。
名词性从句全面讲解
名词性从句全面讲解名词性从句是英语中的一种从属从句，它在句中充当名词的功能。
名词性从句可以在句子中作主语、宾语、表语和同位语等，并且可以由不同的引导词引导。
本文将全面讲解名词性从句的基本概念、用法及常见的引导词。
一、名词性从句的概念名词性从句是由一个词或一个词组引导的从句，它在句子中充当名词的角色。
名词性从句通常出现在复杂的句子中，起到连接主句和从句的作用。
名词性从句的引导词有很多种类，常见的有：that, whether, if, what, which, who, whom, whose, when, where, why等。
二、名词性从句的用法名词性从句可以在句子中作不同的成分，下面分别介绍其主要用法。
1. 名词性从句作主语名词性从句可以作为主语来引导句子，常用的引导词有：- That: That he is innocent surprises me.（他是无辜的让我吃惊。
）- Whether/If: Whether he will come or not is uncertain.（他是否会来还不确定。
）- What: What you said is true.（你说的是真的。
）2. 名词性从句作宾语名词性从句可以作为宾语来引导句子，常用的引导词有：- That: I know that he is a doctor.（我知道他是个医生。
）- Whether/If: I wonder whether/if it will rain tomorrow.（我想知道明天是否会下雨。
）- What: I don't understand what he is saying.（我不明白他在说什么。
）3. 名词性从句作表语名词性从句可以作为表语来引导句子，常用的引导词有：- That: The truth is that she is not happy.（事实是她不幸福。
）- Whether/If: The question is whether/if we should go or not.（问题是我们是否应该去。
【精品】高中英语语法讲解：名词性从句
高中英语语法讲解：名词性从句一、概念名词性从句在句子中起名词作用，它在整个句子中能担任主语、宾语、表语或同位语。
根据它在句中充当的不同成分，名词性从句可分别称为主语从句、宾语从句、表语从句或同位语从句。
没有主语从句、宾语从句/表语从句，整个句子就缺少了主语/宾语/表语，句子结构不完整；没有同位语从句，句子结构完整，但句意不完整。
注：区别于定语从句（形容词性从句）：限制性定语从句相当于一个形容词，修饰主句中的某个名词，做它的定语；非限制性定语从句，几乎完全独立于主句，没有定从，虽然句意不一定完整，但句子结构仍然完整。
I know the girl who is reading over there.He came home safe and sound, which was a great relief to his family.二、4类连接词&注意点1．that （1）连接主句与从句（2）无意义（3）不做从句中的成分（4）能否省略2．if/whether （1）连接（2）表“是否”（3）不做成分（4）whether与if区别3．疑问代词what, who, whom, which &whatever, whoever, whomever, whichever（1）连接（2）表不同含义（3）做从句中的重要成分4．疑问副词when, where, why, how（1）连接（2）表不同含义（3）做从句中的状语三、四种名词性从句1．主语从句（1）普通主语从句That he is still alive is sheer luck.注：that位于句首引导主从，一定不省。
Whether the plan is practicable remains to be seen.What we need are many instructive books.What we need is more time and money. 注：主从做主语，主句谓语动词一般用单数，但what引导的主从，根据后面表语的意义一致原则。
高中英语语法知识点：名词性从句
高中英语语法知识点：名词性从句(一)that引导的名词性从句that引导名词性从句时本身无意义，只起连接作用，也不在句中作任何成分。
它引导的名词性从句结构和意义都完整，往往用于陈述事实。
引导主语从句、表语从句和同位语从句时，that不能省略。
引导宾语从句时，在口语和非正式文体中，that可省略。
但下列情况下，that不可省略：1．that从句作介词的宾语；I don't know exactly where he lives, except that it's somewhere out in the wilds.他具体住在哪里我不是很清楚，只知道是远离城市的边远地区。
2．that引导的从句位于句首时；That the earth goes around the sun is known to us all.众所周知，地球围着太阳转。
3．宾语从句前有插入语时；We hope, on the contrary, that he will stay at home with us.恰恰相反，我们希望他和我们待在家里。
4．动词后有多个that引导的宾语从句时，只有第一个that可省略，从第二个从句开始that不可省略；He told me (that) he had to leave and that he would be back soon.他告诉我他得离开并且很快就会回来。
5．it作形式宾语时，that引导的宾语从句中that往往不可省略。
He has made it clear that the meeting will not be postponed.他清楚地表明会议不会被推迟。
(二)that引导主语从句时可用it作形式主语的四大句式1．It＋be＋形容词(necessary, right, likely, unlikely, wrong, important, certain, clear, obvious, strange, normal等)＋that从句It isn't likely that I should accept such an offer as that.我不可能接受像那样的帮助。
th语法专题 名词性从句
语法专题名词性从句(Noun Clauses) 1.概念在句子中起名词作用的句子叫名词性从句。
2. 种类1) 主语从句:主语从句+ 谓语动词+ 其他2) 表语从句:主语+ 系动词+ 表语从句3) 宾语从句:及物动词/介词+ 宾语从句4) 同位语从句:名词/代词+ 同位语从句例句展示◆That they will win the game is certain. →It is certain that they will win the game.◆Whether the task can be finished on time is still unknown.→It is still unknown whether the task can be finished on time.◆Why he didn’t come here is not clear to anyone.→It is not clear to anyone why he didn’t come here.◆Whoever breaks the law should be punished.◆What he said at the meeting is important.例句展示★Can you tell me when and how I can get to the city?★I don’t understand what he means.★I am not sure whether he would help me.★He said that he had visited his former English teacher several times.例句展示◆It is still a question whether the bridge can be completed next month.◆When she heard the news that the earthquake happened in her hometown, she lost consciousness.◆They have no idea whether they should go on with the search.◆The question who can go to the meeting hasn’t been decided.名从考点：1. what和that_____he can’t finish the work on time is ____makes us worry. (KEY:That，what) 注：what在从句中作主语、宾语、表语等。
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语法专题 名词性从句 (Noun Clauses)1.概念在句子中起名词作用的句子叫名词性从句。
2. 种类1) 主语从句: 主语从句 + 谓语动词+ 其他2) 表语从句: 主语 + 系动词+ 表语从句3) 宾语从句: 及物动词 /介词+ 宾语从句4) 同位语从句: 名词 /代词+ 同位语从句 3.名从引导词分类及作用:名词性从句的引导词作用 连接词that, whether/if （是否） 不作成分只起连接作用 连接代词what(ever) ，who(ever)， whom(ever) ， which(ever) whose 作主、宾、表、 定语 连接副词 when(ever), where(ver), why, how, 作状语缺主/宾/表/ 定补代词what(ever)who(ever) whom(ever) which(ever) whose只缺“是否”意思补whether ，if 什么都不缺that 补副词when(ever),where(ver), why, how 解题方法：2 、分析从句句子成分,缺什么，补什么1、找主句谓语，确定是什么从句3、确定词性后,再根据句子意思选择引导词。
缺状语例句展示◆That they will win the game is certain. →It is certain that they will win the game.◆Whether the task can be finished on time is still unknown.→It is still unknown whether the task can be finished on time.◆Why he didn’t come here is not clear to anyone.→It is not clear to anyone why he didn’t come here.◆Whoever breaks the law should be punished.◆What he said at the meeting is important.例句展示★Can you tell me when and how I can get to the city?★I don’t understand what he means.★I am not sure whether he would help me.★He said that he had visited his former English teacher several times.例句展示◆It is still a question whether the bridge can be completed next month.◆When she heard the news that the earthquake happened in her hometown, she lost consciousness.◆They have no idea whether they should go on with the search.◆The question who can go to the meeting hasn’t been decided.名从考点：1. what和that_____he can’t finish the work on time is ____makes us worry. (KEY:That，what) 注：what在从句中作主语、宾语、表语等。
that只起连接作用, 在从句中不作任何成分。
2. 名词性从句中的谓语语气问题1) I advise that he ____________ (stay) and wait here．2) It is advised that we __________ (hold) another meeting to discuss the question.3) My advice is that the injured man ________ (send) to hospital at once．KEY 1) (should) stay 2) (should) hold 3) (should) be sent注：表“建议、命令、要求、安排”等词其后的名词性从句要用虚拟语气：（should）+动词原形。
此类词有：advise/suggest/propose/ recommend/insist/order/command/demand / require/ request等等。
3. that的省略与保留1) _______ they would take the risk is clear.2) The reason is ______ he is careless.3) I don’t think _______ she is coming.4) We all knew ______ he got the first prize and ______ he was very excited.5).We must make it clear ______ we mean what we say.KEY 1)That 2)that 3) (that) 4) (that), that 5)that注：可省：单个的宾语从句中不可省：主从，表从中；并列宾语从句中, 第2个宾语从句中的that不省；在it作形式主/宾语的句型中。
4. which, what1) I can’t imagine _______ made him act like that.2) ______ he wants is a book.3) I read about it in this book or that book, I can’t remember ______ it was.4) Would you mind telling me ______ language your friend speaks, English or French?KEY 1) what 2) What 3) which 4) which注：what 什么, 泛指；which哪个, 一般有选择范围。
EX1 语法填空1. The fact has worried many scientists the earth is becoming warmer and warmer these years.2. Could I speak to is in charge of International Sales please?3. We have been prepared to do it takes to save her life.4. News came from the school office Wang Lin had been admitted to Beijing University.5. As a new diplomat, he often thinks of he can react more appropriately on such occasions.6. was most important to her, she told me, was her family.7. When asked they loved most, 90% of the kids turned it to their parents.8. The little girl who got lost decided to remain she was and wait for her mother.EX2 完成句子1. 大家都公认，树木对于环保是很必要的。
(It is universally acknowledged that...)are indispensable to __________________ 2. 据报道，洪水让两千多人无家可归。
(It is reported that..., leave...homeless)_____________________________________________________________________ 3. 十分之九的父母都说他们教育孩子的方式与他们自己的父母比起来有很大的差异。
(there were significant differences in their approach to sth., compared with)4. 他昨天上学迟到，因为遇上了交通堵塞。
(the reason why ... is that ..., be stuck in)5. 唯一奇怪的是各州都对这个消息充耳不闻。
(the only wonder is that ..., close one’s ears to sth.)_____________________________________________________________________EX3 翻译句子1. 很明显，学生应该为自己的将来作好准备。
(主语从句)_____________________________________________________________________ 2. 想要待在宾馆里的人自己买单。
(主语从句，pay one’s own way)_____________________________________________________________________ 3. 他每天读英语，难怪英语学得这么好。
(主语从句)_____________________________________________________________________ 4. 在那个贫穷的小村庄的所见所闻给我们留下了深刻的印象。
(主语从句)_______________________________________________________________________________ 5. 作为他最好的朋友，我确信他会准时到的。
(宾语从句)_____________________________________________________________________6. 他自己对他在这篇文章中写的东西不满意。
(宾语从句)7. 我无法想象他是如何解出这道难题的。
(宾语从句)_____________________________________________________________________ 8. 最后一次我们玩得很开心是在参观海洋公园的时候。