高中英语主语从句最全解析
高中英语名词性从句之主语从句解析_
高中英语名词性从句之主语从句解析_主语从句就是在复合句中作主句的主语。
引导词语分成三种：连词：that,whether;疑问代词：who,what,which,whose,whatever,etc.连接副词有：when,where,why,how,wherever,etc.1、that引导的主语从句这个词不同于其它的连词，在主语从句中没有什么意义，也不充当什么成分，只是作为一个简单的连词，但是还不可以省略掉。
这是经常使用的一种主语从句，但是这种主语从句很少用于句首，除非是强调句或者谓语过长。
例如说：That prices will keep going up is certain in 2009.一般情况下，that引导主语从句时，常用it作形式主语，而将正真的主语that从句放在句尾。
这样的结构如下：(1)it+be+形容词+that从句如：It is natural that people should havedifferent opinions.(2)it+名词+that从句如：It s a wonder that they are still alive.(3)it+动词+that从句如：It happened that he didn t go out because of the bad weather that day.(4)it+动词被动语态+that从句如：It s said that there was a big earthquake in Wen chuan several days ago.2、连接代词或者是连接副词引导的主语从句。
下面有三个例子，Who is sent to work there hasn t been decided yet.Whoever comes will be welcome.Whichever you choose is yours.通过上面的例句，可以看出下面这个题目的答案了。
高中英语主语从句讲析课件可修改全文
3. It is a pity that I missed the train.
4. It doesn’t matter whether he will come or not.
5. It seems that it is going to rain.
It’s likely/possible/important/necessary/clear that 很可能/重要的是…/必要的是…/很清楚… It+ be +名词+ that 从句 It’s no wonder that…并不奇怪/无疑
It’s a pity/a fact /a common knowledge (众所周知） / a common saying（俗话说）that It+ be + 不及物动词+ that从句 It seems/appears/happens that…显然、明显、碰巧
matter much.
if, whether都可表示“是否”, 但if不能引 导位于主句之前的主语从句，它可以引导 位于主句之后带有形式主语it的主语从句。
3. TWhhaatt the professor said is of great importance.
that引导主语从句时无词义。What the professor said表示“教授所说的”。
6. It happened that they didn’t know my address.
请你归纳 ？
T——h—a—t —a—s—t—o—r—m——is——c—o—m—i—n—g
is well reported
(完整版)主语从句详解+例句
(完整版)主语从句详解+例句主语从句是复合句中的一个重要成分，由一个从句作为主语，起到句子中主语的作用。
本文将详细介绍主语从句的结构和用法，并提供一些例句进行说明。
1. 主语从句的结构主语从句由引导词和一个从句组成，引导词在句子中充当主语的角色。
常见的引导词有：- that- whether/if- who- whom- which- what- whoever- whatever主语从句的结构可以是以下几种形式：- 陈述句形式：[that + 陈述句]- 一般疑问句形式：[whether/if + 陈述句]- 特殊疑问句形式：[疑问词 + 陈述句]2. 主语从句的用法- 主语从句可以替代主句中的名词或名词短语作为主语，使句子更加简洁明了。
例如：- That he is late is unacceptable.（他迟到是不能接受的。
）- What you said surprised me.（你说的话让我很吃惊。
）- 主语从句常用于强调句型中，强调句型的结构为：[It + 系动词 + 主语从句 + 其他成分]。
例如：- It is important that we take action now.（我们现在采取行动是很重要的。
）- It doesn't matter what they think.（他们怎么想并不重要。
）3. 主语从句的例句- That he didn't show up was disappointing.（他没有露面是令人失望的。
）- Whether she will join us is still unknown.（她是否会加入我们还不知道。
）- Who will be the winner is yet to be determined.（谁将会是胜利者还有待确定。
）- It is surprising that they didn't invite him.（他们没有邀请他是令人惊讶的。
2023年高中英语语法精讲,主语从句详细讲解
2023年高中英语语法精讲—主语从句详细讲解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：1. that引导eg. That you are coming to London is the best news I have heard this long time.2. whether引导eg. Whether they would come to conference was a question.3. 连接代词引导: who,whom, whose, what, which, whoever, whomever, whichever, whatevereg. Whoever is top from wins the game when two matched players meet.4. 连接副词引导: therefore, besides, otherwise, however, moreover, still, thus, meanwhileeg. How this happended is not clear to anyone.5. 关系代词型what引导三. 形式主语it:1. 对关系代词型what引导的主语从句，可以使用形式主语。
eg. It is clear enough what he meant.2. 如果句子是疑问句，则必须用带形式主语it的结构.eg. Is it true that all of us need to to conference?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。
高中英语从句之主语从句讲解(特殊句式系列)
高中英语从句之主语从句讲解（特殊句式系列）一，that引导但是补充当成分的主语从句That the man can get it is known to all=It's known to all that the man can get it 这个男人能得到它是众所众知的。
1，It's important that you can learn English well你能学好英语是很重要的2，It's known that you are so strong你很强壮是众所周知的。
二，if 和whether 做的连接词的主语从句It is not sure whether he will come to your house or not 他是否来你家是不确定=Whether he will come to your house or not is not sureIt is not sure if he will come to your house三，疑问代词引导的主语从句What you can see is true 你所看到的都是真的Whom you are talking with is my friend 你正在聊天的这个人是我的朋友What I want are the bags on the desk 我所想要的是在桌子上的包。
What I want is a bag on the desk 我所有想要的是在桌子上的那个包。
It is true what you can see 你所看到的都是真的It is a bag on the desk what I want四，it 做形式主语的几种形式1，常用形容词：Certain 明确的，clear 清晰的，important重要的，natural自然的，necessary 必要的，obvious明显的，unbelievable 难以置信的，strange 奇怪的，unlikely不可能的，right 正确It is unlikely that you can lift the big stone 你能举起这个大石头是不可能的。
高中英语主语从句语法解释
高中英语主语从句语法解释高中英语主语从句语法解释高中英语语法主语从句1．定义：用作主语的从句叫做主语从句。
2．构成：关联词+简单句3．引导主语从句的关联词有三类：(1) 从属连词that。
如：That they were in truth sisters was clear from the facial resemblance between them.很明显，她们确是亲姐妹，她们的脸型很相似。
(2) 从属连词whether。
如：Whether hell come here isnt clear. 他是否会来这里还不清楚。
(3) 连接代词who, whom, whose, what, which, whoever, whatever, whichever连接副词 where, when, how, why。
如：What she did is not yet known. 她干了什么尚不清楚。
How this happened is not clear to anyone. 这事怎样发生的，谁也不清楚。
Whoever comes is welcome. 不论谁来都欢迎。
Wherever you are is my home ---- my only home. 你所在的`任何地方就是我的家----我唯一的家。
解释：1．主语从句能用it作形式上的主语。
常以it作形式主语的句型有：A. It+be+形容词(obvious, true, natural, surprising, good, wonderful, funny, possible, likely, certain, probable, etc.)+that从句。
如：It is certain that she will do well in her exam. 毫无疑问她考试成绩会很好。
【高中英语主语从句语法解释】。
高考英语主语从句知识点
高考英语主语从句知识点主语从句是英语语法中的一个重要知识点，也是高考中经常考察的内容之一。
掌握主语从句的使用方法和注意事项，对于提高语法准确性和阅读理解能力都非常有帮助。
本文将介绍主语从句的定义、使用时的注意事项以及一些常见的主语从句的句型。
一、主语从句的定义主语从句是指在一个句子中充当主语的从句。
它通常由连词that, whether或if引导，也可以由关系代词what, who, which,whom等引导。
二、主语从句的使用注意事项1.主语从句的用法多样化，可以表示陈述、疑问、建议、要求等不同的意义。
在使用时需要根据具体语境进行选择。
2.如果主语从句谓语动词是不及物动词，需要用it作形式主语。
例如：It is important that we study hard.3.在表示是否时，通常用whether或if引导主语从句。
例如：Whether you go or not is up to you.4.在表示疑问句时，常用疑问词引导主语从句。
例如：What you said is not clear.5.当主语从句与主句的主语一致时，可以用it作形式主语。
例如：It's a pity that you missed the party.三、常见的主语从句句型1.由that引导的主语从句。
例如：That he is rich is well known.2.由wh-词引导的主语从句。
例如：What she said is true.3.由whether或if引导的主语从句。
例如：Whether he will come to the party remains to be seen.4.由it作形式主语的主语从句。
例如：It doesn't matter whether you come or not.5.句型：It is + adj. + that从句。
例如：It is important that we protect the environment.四、主语从句的练习题1. ______ you have any questions, please feel free to ask. (whether/if)2. ______ he will pass the exam is still unknown. (that)3. ______ are you going to give your presentation? (where)4. ______ I owe you an apology is obvious. (that)5. ______ he is doing now is to prepare for the final exam. (what)答案：1. Whether2. That3. Where4. That5. What通过以上介绍，我们了解了主语从句的定义、使用注意事项以及常见的句型。
高中英语主语从句 知识点讲解
主语从句在从句中充当主语的复合句，主语即为主句动作的发出者或状态的持有者。
有两种形式：直接放句首；it 为形式主语，真正的主语在句子后（为了避免头重脚轻）。
主语从句时态不受主句的限制。
（一）连接词引导的主语从句主语从句在复合句中作主句的主语,引导主语从句的词有从属连词that, whether以及连接代词who, what, which, whoever, whatever, whichever和连接副词when, where, why, how等.连接词引导的从句That light travels in straight line is known to all.我们都知道光是以直线传播的。
Whether he will join us is still a question.他是否会加入我们仍是个问题。
连接代词引导的从句Who will be sent there has not been decided.大家还没有决定谁会被送过来。
（主语）What you need is more practice. 你需要更多的练习。
(宾语)Whatever we do is to serve the people.我们无论做什么都是为了服务人民。
（宾语）Which is the best is not clear.我们不清楚哪个最好。
(主语)连接副词引导的从句Where he has gone is a question.我们不知道他去哪儿了。
（地点状）How he can earn a living in London remains a big problem. 如何在伦敦谋生仍是个大问题。
（方式状）When we shall have our sports meet is a mystery. 什么时候会开运动会仍是个迷。
（时间状）注意：在主语从句中，为了避免头重脚轻的问题，常用it为形式主语，真正的主语在句子后。
主语从句高考知识点总结
一、主语从句的定义主语从句是一个句子中作主语的从句。
主语从句通常由连接词引导，例如that, whether, who, whom, whose, which, what, 等等。
主语从句在句子中担任主语的角色，也就是说，它起着说明中心事实或判断的作用。
二、主语从句的结构1. 连接词 + 主语从句连接词即引导主语从句的词语，常见的连接词有that, whether, who, whom, whose, which, what等。
例如：What he said is true.（他说的是真的。
）2. 主语从句 + 谓语 + 宾语/表语主语从句通常接在谓语动词之后，谓语之后可以是宾语或表语。
例如：Who will win the game is not yet known.（谁将赢得比赛尚未得知。
）三、主语从句的用法1. 说明中心事实或判断主语从句通常用来说明一个中心事实或判断，表示一个动作或状态。
例如：What he does is none of my business.（他做的事对我无关。
）2. 引出提问有时候主语从句用来引出提问，表示对某一事实或情况的疑问。
例如：What happened to Tom is still a mystery.（汤姆发生了什么事情还是个谜。
）3. 引导宾语从句有时主语从句还可以引导宾语从句。
例如：What he said is not true.（他说的不是真的。
）4. 引导表语从句主语从句也可以引导表语从句。
例如：What I want is a peaceful life.（我想要的是一种和平的生活。
）1. 主语从句中的谓语动词应该根据主语从句的人称和数保持一致。
例如：What he says is true.（他说的是真的。
）2. 主语从句中的连接词不能省略。
例如：I don’t know who will come.（我不知道谁会来。
）3. 主语从句中的连接词有时候可以省略。
主语从句的知识点总结
主语从句的知识点总结一、主语从句的引导词1. that“that”可引导宾语从句，如：I know that she is beautiful.（我知道她很漂亮。
）但是“that”也可以引导主语从句, 如：That you are late is not acceptable.（你迟到是不可接受的。
）2. whether“whether”表示“是否”，引导宾语从句，也可引导主语从句，如：Whether we win or lose, we will do our best.（无论输赢，我们会尽最大努力。
）3. who“who”指人，引导主语从句时，句子的谓语动词要用单数形式，如：Who is in charge of the project is still unknown.（谁负责这个项目还是未知的。
）4. whom“whom”也指人，多用于正式场合，引导主语从句，如：Whom the vase belongs to is a mystery.（这个花瓶属于谁是个谜。
）5. whose“whose”表示“谁的”，也可以引导主语从句，如：Whose book is on the desk is unknown.（谁的书在桌子上尚不得而知。
）6. which“which”指物，引导主语从句时，句子的谓语动词要用单数形式，如：Which to choose is the problem.（选择哪一个是问题。
）7. what“what”指事物，引导主语从句时，句子的谓语动词要用单数形式，如：What is delicious depends on personal taste.（美味与否因人而异。
）8. whoever“whoever”指代“任何人”，也可以引导主语从句，如：Whoever stole my wallet is in big trouble.（谁偷了我的钱包麻烦大了。
）9. whomever“whomever”用于正式场合，指代“任何人”，也可以引导主语从句，如：Whomever you choose will be fine.（无论你选择谁都行。
202X年高中英语语法精讲之主语从句详细讲解
千里之行，始于足下。
202X年高中英语语法精讲之主语从句详细讲解主语从句是指在一个句子中充当主语的从句。
下面是202X年高中英语语法精讲之主语从句的详细讲解：1. 主语从句的引导词：主语从句的引导词有：that, whether/if。
例如：- That he has passed the exam is good news.- Whether he will come to the party is still unknown.- If it will rain tomorrow worries me.2. 主语从句的用法：（1）主语从句可以替代整个句子作为主语。
例如：- What he said is true. (He said something.)- Whether you like it or not doesn't matter. (You like it or not doesn't matter.)（2）主语从句的谓语动词通常为单数形式，与从句中的主语一致。
例如：- What she wants is a new car. (What she wants = She wants a new car.)- Whether he is responsible for the accident is still under investigation. (Whether he is responsible for the accident = He is responsible for the accident.)3. 主语从句的位置：第1页/共2页锲而不舍，金石可镂。
通常，主语从句位于句首，后面跟着一个逗号。
但如果主句以it作为形式主语，主语从句则位于句尾。
例如：- How the accident happened is still a mystery. (主语从句位于句首) - It is a mystery how the accident happened. (主语从句位于句尾)4. 不定式作主语：不定式也可以作为主语，表示未定的动作或状态。
高中英语知识点归纳主语从句的用法
高中英语知识点归纳主语从句的用法主语从句是英语语法中的一个重要知识点。
它用于修饰主句的主语，并在句子中起到名称、代词或名词性从句的作用。
通过使用主语从句，可以使句子结构更加丰富多样，表达更加具体清晰。
下面是对主语从句的用法进行归纳总结。
1. 引导主语从句的连接词：主语从句通常由从属连词引导，常用的引导词有：- That：常用于陈述句中，作为连接词引导主语从句。
例如：“That he is a talented singer is widely known.”- Whether/if：用于疑问句或选择句中，引导主语从句。
例如：“Whether he will come or not is still uncertain.”- Who/whom/whose：用于引导讨论人的主语从句。
例如：“Who will be the next president is under discussion.”- What/which：用于指代事物的主语从句。
例如：“What happened yesterday is beyond my control.”2. 主语从句在句子中的位置：主语从句通常在句子中作为主语出现，放在句首。
例如：“Why he left in such a hurry is still a mystery.”3. 动词形式与主语从句：主语从句的谓语动词形式与从句中的主语保持一致，即采用单数或复数形式。
例如：“What I want is a peaceful life.”4. 主语从句的时态：主语从句的时态通常与主句时态保持一致。
例如：“That she has passed the exam is a great relief to her parents.”5. 特殊情况下的主语从句：在某些特殊情况下，主语从句中的谓语动词应为不定式形式。
如：- It + be + 原形动词 + that从句：例如“It is important to study hard.”- There + be + 名词 + that从句：例如“There is no doubt that he is telling the truth.”通过对主语从句的学习与理解，可以更好地运用它，丰富句子结构，使语言表达更加准确、流畅。
高中英语会考主语从句知识点总结
高中英语会考主语从句知识点总结在学习中，大家都背过不少知识点，肯定对知识点非常熟悉吧！知识点也不一定都是文字，数学的知识点除了定义，同样重要的公式也可以理解为知识点。
你知道哪些知识点是真正对我们有帮助的吗？下面是作者为大家收集的高中英语会考主语从句知识点总结，供大家参考借鉴，希望可以帮助到有需要的朋友。
知识点总结1：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。
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。
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)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 mon knowledge that …是常识(2) It is + 形容词 + 从句It is natur al 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…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…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。
高中英语主语从句讲解
Lesson 5 根据从句在句子中的功能分根据从句的性质分 定语从句形容词性从句主语从句名词性从句 宾语从句表语从句同位语从句状语从句 副词性从句 主语从句1.概念：在复合句中充当主语成分的句子叫做主语从句。
2.引导主语从句的词● 连词：that, whether 起连接作用不充当成分，但不能省略That he is a famous singer is known to us.Whether he’ll come here isn’t clear.注意: 由that 引导的主语从句有时为了使句子结构平衡, 避免 “头重脚轻”, 常用 it 作形式主语, 而把从句放在后面。
That he is a famous singer is known to us.It is known to us that he is a famous singer.● 连接代词：what(ever),who(ever), which(ever)，whose 充当主语/宾语/定语等 What many scientists believe is that the earth is round.Whatever was said here must be kept secret.Who will take part in the meeting has not been decided.Whoever breaks the law will be punished.Which student will win is uncertain.● 连接副词：when, where, how ,why 充当状语表时间、地点、方式、原因 When your uncle will arrive was not mentioned in his letter.Where the painter is from is unknown to us all.How we’ll solve the problem should be discussed againWhy you went there alone must be explained to us.3.It 作形式主语的一些固定用法：● It +be + n ( a pity/ a fact/ a good idea/ an honor/ a mystery/ a pleasure/ a shame/ a wonder/ a challenge…) + that 从句e.g. It is a pity that you missed the party .● It +be + adj(certain/ possible/ unlikely/ obvious)+从句e.g. It is certain that we will do a good job.★特殊情况：It +be+adj (important/ essential/ natural/ necessary)+ that sb. should do e.g. It is necessary that we should learn a foreign language● It +不及物动词(happened/occurred to / seems/ matters/ appears…) +从句 e.g. It matters whether he will accept our invitation.● It + be +过去分词(known/ said/reported/ believed/ suggested/ stressed) +从句 e.g. It is known to all that heart attack is terrible.。
高考英语主语从句讲解
高考英语主语从句讲解高考英语主语从句定义：用作主语的从句叫主语从句，它是名词性从句之一。
主语从句的时态：不受主句的时态影响和限制。
引导主语从句的连接词有：从属连词: that, whether；连接代词: who (whoever), whom, whose, what (whatever)和which (whichever)；连接副词: when, where, how和why。
连接词：1. 从属连词：that，whether1）that引导主语从句只起引导作用，在主语从句中不充当任何成分，that本身无实际意义，但不能省略。
2）whether意为“是否”，放在句首句末皆可。
由whether引导的名词从句做主语，表语，介词宾语，同位语时！不可用if代替。
a.That price will go up is certain.b. Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
2. 连接代词who ，what ，which, whatever, whichever, whoever (Who, whom, which, what可以和ever构成合成词，和what一样引导从句，ever起到强调作用。
此类主语从句不能用形式主语it引导，它们在句子中担任成分，不能省略，语序为陈述语序，既有疑问含义,又起连接作用,同时在从句中充当各种成分。
Which side will win is not clear. Whoever breaks the law will be punished.Whatever he did is right. Who killed the scientist remains a question.1）What和that引导的主语从句的区别：that 只起引导作用，不充当任何成分，没有意思。
What 不仅起引导作用，还要充当一定成分(主语、宾语或表语)，意思是：“什么”。
（完整）高中英语主语从句全面讲解
（完整）高中英语主语从句全面讲解语法——Noun clauses as the subject主语从句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。
①That he finished writing the composition in such a short time surprised us all.②What we need are good doctors.③Whom we must study for is a question of great importance.1.主语从句的连接词1).连接词: that, whether①.That he will win is certain.②.Whether he’ll join us in the discussion is of great importance.2).连接代词: who, what, which, whom , whose, whoever, whatever, whichever①.It is clear who is afraid of having a change in land ownership.②.What India needs is a law to make land ownership fairer.3).连接副词: when, where, why, how, how many, how much , how long, how soon, how often①When we’ll start tomorrow wil l be told soon.②Where we can buy oxen is something we need to find out.③Why he came here is not known.④How we can protect the grain from damp needs to be discussed.【连接词】1. that——That t he earth moves around the sun is well known.2. whether——Whether he will come or not is not known yet.3. who ——Who will be sent there has not been decided.4. what——What you need is more practice.5. which——Which one is the best is not clear.6. when, where ——Where he has gone is a question.7. why, how——Why there is gravity is hard to understand.How he can earn a living in Britain remains a big problem.8. whoever、whatever、whichever可引导主语从句。
高中英语知识点归纳主语从句的种类与用法
高中英语知识点归纳主语从句的种类与用法主语从句是英语语法中的一个重要知识点。
它是由一个句子成为一个句子的主语，可以用来替代一个名词性成分作为整个句子的主语。
主语从句的种类与用法可以通过以下几个方面进行归纳。
一、宾语从句宾语从句是主语从句中最常见的一种类型。
宾语从句通常用来当作动词的宾语，表示主句中的某个动作或状态所作用的对象。
常见的动词有think、believe、know、want、hope等。
例如：1. I believe that she will come back soon.（我相信她很快会回来。
）2. He asked if she could help him.（他问她是否能帮助他。
）二、表语从句表语从句用来修饰主句中的主语或宾语，起到对主语或宾语进行补充或说明的作用。
常用的动词有be、seem、appear、look等。
例如：1. The problem is that he has no money.（问题是他没有钱。
）2. My dream is to become a doctor.（我的梦想是成为一名医生。
）三、同位语从句同位语从句用来对主句中名词性成分进行解释或进一步说明。
同位语从句通常出现在一些特定的名词后面，例如fact、news、idea等。
例如：1. The news that he passed the exam made us all happy.（他通过了考试的消息让我们都很高兴。
）2. The fact that she lied to me disappointed me.（她对我撒谎的事实让我很失望。
）四、定语从句定语从句用来修饰主句中的名词或代词，并对其进行限制或说明。
定语从句通常出现在被修饰的名词或代词之后。
例如：1. The book that I borrowed from the library is very interesting.（我从图书馆借的书非常有趣。
高中英语知识点归纳主语从句的引导词与用法总结
高中英语知识点归纳主语从句的引导词与用法总结主语从句是英语中常见的一种从句类型，用于引导句子的主语。
它可以由多个引导词来引导，这些引导词在语法和用法上略有不同。
本文将对高中英语中主语从句的引导词和用法进行总结。
一、引导词的分类主语从句的引导词可以分为以下几类：1. Wh-引导词：who, whom, whose, which, what, when, where, why, how等。
这类引导词通常用于提问，引导主语从句时可以替代句子中的主语部分，用来引导对主语进行提问的从句。
2. Whether和if：这两个引导词在引导主语从句时可以互换使用，用于表示“是否”的意思。
通常用在动词后面，引导一个带主语从句的宾语。
3. It：主语从句中的主语部分有时可以用it来表示，特别是当主语从句较长或复杂时，为了简化句子结构，可以用it作为形式主语。
4. That：that可以引导主语从句，表示“那”，用于强调主语从句的真实性和确定性。
二、用法总结1. Wh-引导词的用法：a) Who, whom, whose用于引导指人的主语从句。
例如：Who is going to the party?b) Which用于指物的主语从句。
例如：Which book is on the table?c) What用于引导不定性的主题从句，通常可以替代who或which。
例如：What makes you think that?d) When用于引导表示时间的主语从句。
例如：When is the meeting?e) Where用于引导表示地点的主语从句。
例如：Where is the nearest hospital?f) Why用于引导表示原因的主语从句。
例如：Why did she leave early?g) How用于引导表示方式、方式和程度的主语从句。
例如：How she won the competition remains a mystery.2. Whether和if的用法：a) Whether和if都可用于引导主语从句，表示“是否”。
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主语从句一、主语从句的连词分三类（1）从属连词引导的主语从句（that whether if）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。
That 引导主语从句通常用it 作形式主语。
例如：That you will win the medal seems unlikely.That she survived the accident is a miracle.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不能在开头，只能用whether。
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.（2）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. 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。
它引导主语从句，并在从句中作主语、宾语、表语等。
whatever = anything that; whoever = anyone who。
要注意和whatever, whoever引导的让步状语从句的区别。
如：Whoever breaks the law should be punished. （主语从句）（＝Anyone who breaks the law should be punished. ）Whoever breaks the law, he should be punished. （让步状语从句）（＝No matter who breaks the law, he should be punished. ）（3）用连接副词when, where, why, how引导的名词性从句(其连接副词有含义,在句中作状语。
)例如:Where we should leave it is a problem.When they will come hasn’t been made pubic.二、it 作形式主语的主语从句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。
这分四种情况：(1)对于以连词that引导的主语从句，通常用形式主语it替代主语从句：<a> It is +名词+从句It is a fact that…事实是……；It is good news that ………是好消息；It is a question that ………是个问题；It is common knowledge that ………是常识类似的名词还有：a pity；a wonder；a good thing；no wonder；surprise等。
It is a mystery to me how it all happened.It is common knowledge that the whale is not a fish.It is no surprise that Bob should have won the game.<b> It is +形容词+从句It is necessary that …有必要……；It is clear that …很清楚……；It is likely that …很可能……；It is important that …重要的是……类似的形容词还有：strange; natural; obvious; true; good; wonderful; possible; unlikely; quite; unusual; certain; evident; worth-while; surprising; interesting; astonishing, etc. It is doubtful whether she will be able to come. It is essential that he should be here by the weekend. It seems obvious that we can not go on like this. It is necessary that you （should）master the computer.需要注意的是这类主语从句中，谓语动词很多为“（should）＋动词原形”，即要用虚拟语气。
<c> It is +过去分词+从句It is said that …据说……；It is reported that …据报道……；It has been proved that …已证明……；It must be proved that…必须指出……类似的过去分词还有：known; estimated; expected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out, etc.例如：It is used to be thought that a new star must be due to a collision between two stars.It has not been made clear when the new road is to be opened to traffic.<d> It seems不及物动词（happened / appears / doesn’t matter / makes no difference / occurred …）that …主语从句不可提前It makes no difference whether he will attend the meeting or not.It does not matter if I missed my train. It happened that I saw him yesterday.(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：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，通常直接将主语从句放在句首。
如：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。
有时也可将助用形式主语。
如：It is clear enough what he meant. 他是什么意思很清楚。
(4)如果句子是疑问句，则必须用带形式主语it的结构：Is it true that he is the girl’s father? 他是那女孩的父亲，是真的吗？How is it that you are late again? 你怎么又迟到了？三、连词that的省略问题引导主语从句的连词that 有时可省，有时不能省，其原则是：若that 引导的主语从句直接位于句首，则that不能省略；若that引导的主语从句位于句末，而在句首使用了形式主语it，则that可以省略：That you didn’t go to the talk was a pity. 很遗憾你没去听报告。
(that 不可省)It was a pity (that) you didn’t go to the talk. 很遗憾你没去听报告。
(that可省)四、高考题：1、It never occurred to me___ you could succeed in persuading him to change his mind.(陕西高考)A．which B．what C．that D．if2、It's obvious to the students________they should get well prepared for their future.(天津卷) A．as B．that C．which D．whether3、________some people regard as a drawback is seen as a plug by many others.(2010·北京) A．Whether B．What C．That D．How4、It is uncertain________side effect the medicine will bring about，although about two thousand patients have taken it.(2010·浙江) A．that B．how C．what D．whether主语从句练习题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 knownC. 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. Whether 12..____ we'll go camping tomorrow depends on the weather.A. IfB. WhetherC. ThatD. Where 13._________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. How B. What C. 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. What B. If C. Why D. 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答案：高考题：CBBA 1~5 CBACD 6~10DDCAA 11~15 CBDAC 16~20 BDCAC。