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名词性从句与主语从句在英语语法中，名词性从句和主语从句是重要的从句类型。
它们都属于从属从句，扮演着整个句子的一个成分。
本文将详细介绍名词性从句和主语从句的定义、特点和用法，并举例说明其在实际应用中的运用。
一、名词性从句的定义和特点1. 定义：名词性从句是指在复合句中充当名词成分的从句。
它可以充当主语、宾语、表语和同位语等。
2. 特点：a. 通常由连词that, whether/if, who, whom, which, what, when, where, why, how等引导；b. 在从句中担任名词的职能，整个从句作为整体在句中起到名词的作用；c. 可以替换为一个单词或短语，使句子更加简洁明了；d. 名词性从句的引导词根据从句所充当的成分来选择。
二、名词性从句的用法名词性从句的常见用法包括主语从句、宾语从句、表语从句和同位语从句。
下面将分别进行讲解。
1. 主语从句主语从句在句子中充当主语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
例如： - Whether we can finish the project on time is still uncertain.- That he stole the money is beyond doubt.- How to solve this problem remains a challenge.2. 宾语从句宾语从句在句子中充当宾语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
例如： - She asked me where I had been all day.- I don't know if he will come to the party.- We should consider whether this plan is feasible.3. 表语从句表语从句在句子中充当表语的角色，常以that, whether/if, who, whom, which, what, when, where, why, how等引导。
名词性从句和主语从句的区别名词性从句和主语从句是英语语法中两个重要的从句类型，它们在使用和功能上有着一些区别。
本文将对名词性从句和主语从句的区别进行详细介绍。
一、名词性从句的定义和功能名词性从句是在句子中充当名词的作用，可以作为主语、宾语、表语或同位语。
名词性从句通常由连接代词（如what, who, whom, which, whoever, whatever）或连接副词（如when, where, why, how）引导。
名词性从句在句子中的功能类似于名词，用于表达陈述、提问、建议、愿望、要求、目的、理由等。
二、主语从句的定义和功能主语从句作为句子的主语，从句中的谓语动词所表示的是主句中的主谓关系。
主语从句通常由连接代词（如what, who, whom, which, whoever, whatever）或连接副词（如when, where, why, how）引导。
主语从句在句子中的功能是充当整个句子的主语，用于表达主谓关系，而且不能省略。
三、名词性从句和主语从句的区别1.位置不同：- 名词性从句可以出现在句子的主语、宾语、表语和同位语等位置，位置较为灵活。
- 主语从句只能作为句子的主语出现，位置不可变。
2.引导词不同：- 名词性从句常由连接代词或连接副词引导。
- 主语从句也常由连接代词或连接副词引导，但通常只由连接代词引导。
3.结构不同：- 名词性从句在结构上是完整的句子，包含主语、谓语和其他成分。
- 主语从句在结构上只包含主语部分，谓语动词在主句中。
4.可替换性不同：- 名词性从句可以被代替为一个单词或一个词组。
- 主语从句在句子中起到主语的作用，不能被代替。
四、名词性从句和主语从句的例句说明1. 名词性从句的例句：- I don't know what he said.（主语从句作宾语）- Tell me where she lives.（主语从句作宾语）2. 主语从句的例句：- What he said is interesting.（名词性从句作主语）- Where she lives is a mystery.（名词性从句作主语）综上所述，名词性从句和主语从句在使用和功能上存在区别。
名词性从句和主语从句的差异名词性从句和主语从句是英语语法中常见的两种从句结构。
尽管它们在句法结构上有一些相似之处，但它们在语法功能和用法上存在显著差异。
本文将详细介绍名词性从句和主语从句的差异，以及它们在句子中的应用。
1. 名词性从句名词性从句是一个完整的句子，其在句子中担任名词的功能。
名词性从句可以充当主语、宾语、表语或同位语。
它通常由连接词引导，如what、where、when、who、which、whether等。
名词性从句通常以陈述句的形式出现，例如：- What she said is true.（她所说的是真的。
）（名词性从句作为主语）- I don't know where he went.（我不知道他去了哪里。
）（名词性从句作为宾语）- His question is whether she will come or not.（他的问题是她是否会来。
）（名词性从句作为表语）- The fact that he passed the exam surprised us.（他通过考试的事实使我们很吃惊。
）（名词性从句作为同位语）名词性从句可以在句子中起到名词的作用，承担特定的语法角色，并且可以被代词所替代。
2. 主语从句主语从句是一个完整的句子，用作主句中的主语。
它通常由连接词引导，如that、whether、who、which等。
主语从句通常以陈述句的形式出现，例如：- That he doesn't like tomatoes surprises me.（他不喜欢西红柿让我很惊讶。
）- Whether we should go camping is still undecided.（我们是否应该去露营还没有决定。
）主语从句在句子中起到名词的作用，承担主语的语法角色。
它和名词性从句一样，在结构和功能上都类似，但主语从句只能用于句子的主语部分。
3. 尽管名词性从句和主语从句之间存在一些相似之处，但它们在语法功能和用法上有一些显著差异。
名词性从句从句有名词性从句、定语从句和状语从句三大类。
名词性从句又可分为宾语从句、表语从句、主语从句及同位语从句，因为从句的在这个句子中的功用相当于名词；定语从句有称为形容词性从句，因为从句功能相当于形容词；而状语从句则称为副词性从句，因为从句功能相当于副词。
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。
宾语从句( The Object Clause)表语从句( The Predicative Clause)主语从句( The Subject Clause)同位语从句( The Appositive Clause)主语从句一．定义在句中充当主语的从句叫做主语从句。
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。
He will come here on Wednesday is certain.他星期三来这里是肯定的。
He will come here on Wednesday is not certain.他星期三是否来这里还不肯定的。
二．类型主语从句主要有四类：（1）由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。
例如：That you will win the medal seems unlikely.That you are so indifferent bothers me.That she survived the accident is a miracle.（2）用连词whether 引导的主语从句: whether有含义(是否)/在句中不做成分/不可以省。
注意：引导主语从句，不能用if，只能用whether。
例如：Whether we will hold a party in the open air tomorrow depends on the weather.Whether she is coming or not doesn’t matter too much.（3）用连接代词引导的主语从句在由连接代词who, whose, whom, which, what, whoever, whomever, whichever, whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分.例如：What you need is more practice.What I want to know is this.Whatever we do is to serve the people.注：whatever / whoever的功用whatever, whoever在主语从句中不含疑问意义。
名词性从句1.名词性从句：名词性从句的功能相当于 , 它在复合句中能担任等，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一、主语从句：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。
结构：1.陈述句作主语从句的构成：That+陈述句+……注意：陈述句转化而来的主语从句，用连词that 引导，放句首，不可省略。
1.地球绕着太阳转是一个事实。
2.我们学好英语是很重要的。
3.你不能来到聚会真遗憾.4.他是对的，我们大家都知道。
2.it作形式主语(1)It+be+adj+(that)+主语从句.Eg.That we learn English well is important.---转化为it作形式主语：That Jack will win the game is possible.---转化为it作形式主语：常见的用法：It is certain that...可以确定......It is clear that ...显然....It is fortunate that ...幸运的是.....It is likely that ....可能......It is natural that ...很自然.....It is necessary that .... 有必要...It is strange that ...奇怪的是...It is important that...重要的是...Eg.重要的是他应该知道这件事.(2)It + be +过去分词+(that)+主语从句.常见的用法：It is said that...据说……It is reported that ...据报道……It is well known that...众所周知……It is believed that ...人们相信……It is thought that... 人们认为……It has been found that ...已经发现……It must be pointed out that ...必须指出的是……It should be noted that...应当注意的是……It has been proved that…已证实…Eg.据说他是中国最优秀的作家。
名词性从句主语从句一．名词性从句的概念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▲请观察下列句子，注意划线部分句子的意义及用法。
1. What surprised me most was that the little girl could play the violin so well.2. Who will go to the concert is not known.3. That she was chosen made us very happy.4. Whether she will come or not is still a question.5. Which book they will choose is still unknown.6. When we shall hold our sports meet is not decided.7. It’s strange that he knows nothing about it.8. It is a pity that she has made such a mistake.9. It is said that President Jingo will visit our school next week.二．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. 主语从句可以由下列从属连词引导：1）that, whether, whether…or等That she is still alive is a consolation.Whether we can help you is a difficult question.Whether we go or not depends on the weather.2）who, whom(只能作宾语), what, which等Whoever breaks the law deserves a fineWhat caused the accident is a complete mystery.Which of these two plans is better remains to be seen.3) whose, what, whichWhose fault it is remains a mystery.Which book you choose is yours.What changes we have made in the plan will be announced later.4）when, where, why, howWhen the meeting will be held has not been announced.Where he lives is unknown to me.Why he did it will remain a puzzle for ever.How I found it out is no concern of yours.2. 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：a) It is a pity that you didn’t go to see the film. 你不去看那场电影真可惜。
b) It doesn’t interest me whether you succeed or not.我对你成功与否不感兴趣。
c) It is in the morning that the murder took place.谋杀案是在早上发生的。
（强调句型）d) It is John that broke the window.是John打碎的窗户。
（强调句型）3. 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（appear, chance, happen, occur, seem）＋从句It seems that…似乎…It happened that…碰巧…It appears that…似乎…(4) It ＋过去分词＋从句It is reported that…据报道…It has been proved that…已证实…It is said that…据说…4. what 与that 在引导主语从句时的区别what 引导主语从句时在句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。
例如：a) What you said yesterday is right.b) That she is still alive is a consolation.Exercise一、用适当的词填空，使句子意思完整。
（that, what, which, how, why whether, whoever）1. ______ he didn’t attend the meeting yesterday wasn’t quite clear.2. The Foreign Minist er said, “It is our hope ______ the two sides will work towards peace.”3. ______ team will win the match is still unknown.4. ______ comes to the party will receive a present.5. ______ Mary has left is still a question.6. It’s repor ted ______ three people were killed in the accident and five were hurt badly.7. ______ he solved the problem successfully interested all of us.8. We usually think ______ we can’t get seems better than what we have.9. It is a fact ______ English is being accepted as an international language.10. ______ is to be sent there to solve the problem hasn’t been decided.二、单选1.______ makes mistakes must correct them.A. WhatB. ThatC. WhoeverD. Whatever2.It worried her a bit _____ her hair was turning grey.A. whileB. thatC. ifD. for3. When and why he came here ____ yet.A. is not knownB. are not knowC. has not knownD. have not known4. ______ is no reason for dismissing her.A. Because she was a few minutes lateB. Owing to a few minutes lateC. The fact that she was a few minutes lateD. Being a few minutes late5._______ Tom liked to eat was different from_____.A. That… that you had expectedB. What… that you had expectedC. That… what you had expectedD. What… what you had expected6. _____ we go swimming every day _____ us a lot of good.A. If… doB. That… doC. If… doesD. That… does7. It ____ Bob drives badly.A. thinks thatB. is thought whatC. thought thatD. is thought that8. It’s uncertain ______ the experiment is worth doing.A. ifB. thatC. whetherD. how9. _____ the boy didn’t take medicine made his mother angry.A. ThatB. WhatC. HowD. Which10. _____ we can’t get seems better than ____ we have.A. What, whatB. What, thatC. That, thatD. That, what11. _____ you don’t like him is none of my business.A. WhatB. WhoC. ThatD. Where12. ____ we’ll go camping tomorrow depends on the weather.A. IfB. WhetherC. ThatD. Where13. _______ is going to do the job will be decided by the Party committee.A. ThatB. WhyC. HowD. Who14. _____ we’ll finish translating the book depends on the time.A. WhenB. WhyC. WhatD. That15. ______ he won’t go there is clear to all of us.A. HowB. WhatC. WhyD. This16. ____ the house will be built will be discussed at tomorrow’s meeting.A. IfB. WhereC. ThatD. What17. _____ you come or not is up to you.A. WhatB. IfC. WhyD. Whether18. ____ makes mistakes must correct them.A. WhoB. AnyoneC. WhoeverD. Anybody19. _____ team will win the match is a matter of public concern.A. WhichB. ThatC. IfD. How20. ______ leaves the room last ought to turn off the lights.A. AnyoneB. The personC. WhoeverD. Who。
