英语主语从句
【高中英语】高中英语知识点：主语从句
【高中英语】高中英语知识点：主语从句主语从句的概念：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。
主语从句通常由从属连词that，whether，if和连接代词what，who，whichwhatever，whoever以及连接副词how，when，where，why等词引导。
that在句中无词义，只起连接作用。
主语从句用法：1、主语从句的引导词：主语从句通常由连词that和whether、相连接代词或相连接副词以及关系代词型what鼓励：如：thatheisstillaliveisawonder.他还活着，真是奇迹。
whenwearrivedoesn'tmatter.什么时候至没关系。
whatweneedismoney.我们需要的是钱。
whatiwanttoknowisthis.我想要晓得的就是这一点。
whethertheywouldsupportuswasaproblem.他们是否会支持我们还是一个问题。
2、主语从句与形式主语it：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。
这分三种情况：(1)对于以连词that鼓励的主语从句，通常用形式主语代主语从句：(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：例如：whethertheywouldsupportuswasaproblem.他们与否可以积极支持我们还是一个问题。
itwasaproblemwhethertheywouldsupportus.他们是否会支持我们还是一个问题。
(3)对关系代词型what鼓励的主语从句，通常不必形式主语，总是主语从句放到句首：如：whatweneedismoney.我们需要的是钱。
whatiwanttoknowisthis.我想要晓得的就是这一点。
(4)如果句子是疑问句，则必须用带形式主语it的结构：例如：isittruethatheisthegirl'sfather?他就是那女孩的父亲，就是真的吗？howisitthatyouarelateagain?你怎么又迟到了？3、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鼓励的主语从句轻易坐落于句首，则that无法省略；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则可以省略：例如：thatyoudidn'tgotothetalkwasapity.很惋惜你没回去听到报告。
【高中英语】高中英语知识点：主语从句
【高中英语】高中英语知识点：主语从句主语从句的概念：如果一个句子在复句中充当主语，那么这个句子就是主语从句。
主语从句通常由下列连词引导：which、if和连接代词what、who、who、who和how、when、where、why和其他副词。
在句子中没有词义，只起到连接作用。
主语从句用法：1.主语从句的引导词：主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导：他还活着真是个奇迹。
whenwearrivedoesn'tmatter.什么时候到没有关系。
什么是钱。
我们需要钱。
whatiwanttoknowisthis.我想知道的就是这一点。
他们是否支持是个问题。
他们是否会支持我们仍然是个问题。
2、主语从句与形式主语it：有时为了考虑句子的平衡，我们通常在主语从句中使用正式主语，把真正主语从句移到句子的末尾。
有三种情况：(1)对于以连词that引导的主语从句，通常用形式主语代主语从句：（2）对于连接代词（副词）引导的主语从句，可以用形式主语代替主语从句，也可以在句首直接使用主语从句：如：whethertheywouldsupportuswasaproblem.他们是否会支持我们还是一个问题。
他们是否支持我们是个问题。
他们是否会支持我们仍然是个问题。
(3)对关系代词型what引导的主语从句，通常不用形式主语，总是主语从句放在句首：我们需要的是钱。
whatiwanttoknowisthis.我想知道的就是这一点。
（4）如果句子是疑问句，则必须使用带有正式主语的结构：如：isittruethatheisthegirl'sfather?他是那女孩的父亲，是真的吗？你怎么又迟到了？你为什么又迟到了？3、连词that的省略问题：有时引导主语从句的连词可以省略，有时不能省略。
原则是：若that引导的主语从句直接位于句首，则that不能省略；如果受其引导的主语从句位于句末，而正式主语则用在句首，则可以省略：如：thatyoudidn'tgotothetalkwasapity.很遗憾你没去听报告。
初中英语知识点主语从句3篇
初中英语知识点主语从句3篇初中英语知识点：主语从句在复合句中充当主语成分的句子叫做主语从句。
常规主语从句，即句子在复合句中充当一个主语。
主语从句的时态：不受主句的时态影响和限制。
例如：That he finished writing the composition in such a short time surprised us all.What we need is time.It is certain that he will win the match.(1) 引导主语从句连词有that,whether,who,what,whatever等(2) 连词位于句首不能省略(3) 主语从句大多数情况下视为第三人称单数主语从句引导词：1、由连词that引导的主语从句。
例如：That you will win the medal seems unlikely.你想获得奖牌看起来是不可能的。
That you are so indifferent bothers me.你如此冷淡使我很烦恼。
That she survived the accident is a miracle.她在事故中幸免于难简直是奇迹。
2、用连接代词或连接副词if, whether 引导的主语从句。
例如： Which of them escaped from the prison is still a mystery. 他们哪一个是从监狱里逃跑的，仍然是个谜。
When they will come h asn’t been made pubic.他们什么时候来还不知道。
Whether she is coming or not doesn’t matter too much.她来不来都无关紧要。
3、用关系代词引导的主语从句。
例如：What you need is more practice.你所需要的是更多的训练。
What I want to know is this. 我想知道的就是这事。
英语语法分类汇总主语从句
英语语法分类汇总主语从句
主语从句
用作主语的从句叫主语从句。
(That the earth goes around the sun) is known to all.
(How this happened) is not clear to anyone.
(Whoever comes) is welcome.
(When we shall have our sports meeting) is still a question.
(Whether he will come today) is still unknown.
注意：
1. 主语从句是特殊疑问句，应该用特殊疑问词加陈述句语序。
2. that引导的主语从句放在句首，不可省略that。
3. 主语从句常用it作形式主语，真正的主语放在后面，这时that可省略。
It's a pity (that) you missed such a good opportunity.
It's still a question when we shall buy the
new equipment.
It's still unknown whether he will come or not.
4. It is + P.P.+ that ; It + Vi + that，It作形式主语。
It is said that the president will visit our company.
It seems that he has caught a cold.。
九种英语主语从句
九种英语主语从句英语中的主语从句是一种句子结构，用来作为句子的主语。
它可以替代一个名词，在句子中起主语的作用。
以下是九种常见的英语主语从句：1. 以that引导的主语从句主语从句以that引导，用来表达它所引导的内容是主要的或重要的。
例如：That he arrived late was disappointing.2. 以whether或if引导的主语从句主语从句以whether或if引导，用来表达对某件事情的疑问或是不确定。
例如：3. 以疑问词引导的主语从句主语从句以疑问词引导，用来回答对某事情的问题。
例如：What she said was really surprising.4. 以动词不定式引导的主语从句主语从句以动词不定式引导，用来表达对某件事情的目的或意图。
例如：To finish the project on time is our main goal.5. 以-ing形式引导的主语从句主语从句以-ing形式引导，用来表达对某事情的现实、可能或不可能。
例如：Swimming in the pool is not allowed.6. 以从属连词that引导的主语从句主语从句以从属连词that引导，用来表达对某事情的描述、判断或信念。
例如：That he is a talented musician is well-known.7. 以it作为形式主语引导的主语从句主语从句以it作为形式主语引导，而真实主语通常位于句子后部。
例如：It is important to have a healthy lifestyle.8. 以as if / as though引导的主语从句主语从句以as if或as though引导，用来表达对某事情的比喻、相似或假设。
例如：He acted as if he knew everything.9. 以现在分词引导的主语从句主语从句以现在分词引导，用来表达对某事情的原因、结果或条件。
英语中的主语从句和引导词
在英语中，主语从句是一种非常常见的句子结构。
它由一个从句充当主句的主语，这意味着它在句子中起着非常重要的作用。
要使用主语从句，我们需要一个引导词来引导从句，并将其连接到主句。
让我们来详细了解一下主语从句和常见的引导词。
首先，让我们明白什么是主语从句。
主语从句通常用来描述句子的主题或主要动作。
它可以代替一个名词短语或从句作为主句的主语。
例如，"What he said"（他所说的）是一个主语从句，它代表了主句的主语。
主语从句的常见引导词有以下几种：1.Whether/if（是否）: Whether和if在主语从句中是可以互换使用的。
它们通常出现在动词后面，用于引导一个是或否的问题。
例如，"Whether you like it or not, we have to go."（无论你喜不喜欢，我们都得走。
）2.That（是）: That是最常见的引导词之一，它通常用于引导事实或陈述句。
例如，"It is important that you finish your homework."（你完成作业是很重要的。
）3.What（什么）: What常用于引导宾语从句，但也可以用于引导主语从句。
例如，"What she said surprised me."（她所说的让我感到惊讶。
）4.Who（谁）: Who常用于引导代替人的主语从句。
例如，"Who will cometo the party is still unknown."（谁将参加派对仍然是个未知数。
）5.Which（哪一个）: Which常用于引导代替事物的主语从句。
例如，"Which book to read is completely up to you."（读什么书完全取决于你。
）6.Whatever（无论什么）: Whatever常用于主语从句中表示不管什么。
高中英语主语从句
高中英语主语从句主语从句，在英语语法中，是一个句子作为主语，它可以是陈述句、疑问句或者是特殊疑问句。
这种从句在高考英语中占据了重要的地位，因此，理解和掌握主语从句的用法对于高中生来说至关重要。
我们要理解什么是主语从句。
主语从句就是一个句子在复合句中充当主语，例如：What he said is not true.在这个句子中，“What he said”就是一个主语从句。
主语从句有三种类型：陈述句、疑问句和特殊疑问句。
陈述句作为主语从句时，通常以that引导，例如：That he will come to the party is certain.疑问句作为主语从句时，通常以whether或what引导，例如：Whether he can come is still a question.特殊疑问句作为主语从句时，通常以who、what、which等引导，例如：Who will come is not clear.在理解了主语从句的基本概念和类型之后，我们还需要掌握如何正确使用主语从句。
使用主语从句时，需要注意以下几点：主语从句的引导词要使用正确；主语从句的时态要和主句保持一致；主语从句的语序要使用陈述句语序。
除了正确使用主语从句，我们还需要理解主语从句的省略情况。
在某些情况下，主语从句可以省略掉that，例如：It is certn (that) he will come.这种情况下，it是形式主语，真正的主语是that he will come。
高中英语主语从句是一个重要的语法知识点，需要我们熟练掌握并正确运用。
只有通过不断的练习和学习，我们才能在高考中取得优异的成绩。
（2）主语从句一般用什么引导词？引导词在从句中担任什么成分？（3）主语从句的时态有什么特殊之处？请举例说明。
（4）主语从句与宾语从句、表语从句有什么异同点？通过预习题，我们对主语从句有了初步的了解。
接下来，我们将深入学习主语从句的构成、用法以及与其他从句的区别。
英语语法之主语从句
连接代词、连接副词和whether引导 的主语从句
• • • • • • • • How he knew this was still a mystery. (It was still a mystery how he knew this.) When she’ll be back depends much on the weather. (It depends much on the weather when she’ll be back.) Who is to head the delegation hasn’t been made public. (It hasn’t been made public who is to head the delegation.) Whether we’ll succeed remains to be seen. It remains to be seen whether we’ll succeed.
第二类：连接代词、连接副词和 whether (it做先行\形式主语)
• • • • • • C. 动词（+宾语或状语）+从句： It doesn’t matter much when we come back. It struck her how gentle he was being. D. 动词的被动语态+从句： Is it known who did it? It is being considered whether he should be dismissed.
第一类：that引导的主语从句
• • • • • • • A. be+形容词+从句： It was quite plain that she didn’t want to help us. How is it possible that a man can fall so low? It’s strange that he knows nothing about it. B. be+名词+从句： It’s a wonder that he got the first prize. It’s a pity that you haven’t seen the play.
英语学习之主语从句详解
英语语法知识讲解之名词性从句:主语从句主语从句有三类：1．由what 等连接代词引导的主语从句由what 引导的主语从句表示“…….所…….的东西”，在结构上等于一个名词加一个定语从句，what 在主语从句中要充当句子成分。
如 What we need is more time.我们所需要的是更多的时间。
what 在主语从句中作 need 的宾语，此句可改写成定语从句 :The thing which we need is more time.What is dif ficult is to do good all one’s life and never do anything bad.难的是一辈子做好事，不做坏事。
（what 在从句中作主语）由 whatever, whoever 引导的主语从句也属于这一类。
如 Whatever was said here must be kept secret.这里说的话都必须保密。
Whoever fails to see this will make a mistake. 谁看不到这一点就会犯错误。
2.由连词that 引导的主语从句在 that 引导的主语从句中，that 不但当句子部分。
如 That she will come is certain. 她来是肯定的。
That he was chosen made us very happy.他被选中了使我们都很高兴。
在更多情况下，这类主语从句都放在句子的后部，而用 it 作形式主语。
如 It is certain that you will be able to make greater progress.你一定能取得更大的进步。
It’s obvious that he is wrong.很明显，他错了。
It’s a pity that you missed such a fine talk.这样好的报告你没听到真遗憾。
高中英语语法主语从句讲解及练习
主语从句一、概述：在句子中起名词作用的各种从句统称为名词性从句。
根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句。
二.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。
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。
九种英语主语从句
九种英语主语从句英语中，主语从句是一种非常常见的从句结构。
它可以用作句子的主语，起到引出或说明整个句子的作用。
以下是九种常见的英语主语从句的类型及示例：1. 名词从句（Noun Clauses）：名词从句作为主语，用于引出或说明某个事物或情况的真相、原因、目的等。
示例：- What he said is true.（他说的是对的。
）2. 代词从句（Pronoun Clauses）：代词从句用一个代词作为主语，描述或说明某人或某事。
示例：- It's important that we finish the project on time.（我们按时完成项目非常重要。
）- Whoever wants to join the club can sign up here.（想加入俱乐部的人可以在这里报名。
）3. 形容词从句（Adjective Clauses）：形容词从句用于修饰某个名词，作为主语起到描述或说明的作用。
示例：- What you just said is not relevant.（你刚才说的不相关。
）- Where he was born has always been a mystery.（他出生在哪里一直是个谜。
）4. 副词从句（Adverb Clauses）：副词从句用于描述或说明一个动作或状态的条件、原因、时间、地点等。
示例：- When he arrives, we can start the meeting.（他一到，我们就可以开始会议。
）- If you study hard, you will pass the exam.（如果你努力研究，你会通过考试。
）5. 不定式从句（Infinitive Clauses）：不定式从句用于说明一个动作的目的、结果等。
示例：- To win the game is our ultimate goal.（赢得比赛是我们的终极目标。
主语从句和宾语从句
英语从句主语从句，表语从句，宾语从句，同位语从句，定语从句，状语从句1.主语从句什么是主语从句？充当主语的从句就是主语从句，表达“什么人”或“什么事”。
例如：The sun is far away from us. 太阳离我们远。
本句是简单句，名词短语the sun做主语。
What she says is not vital. 她说的不重要。
复合句，从句what she says 做主语，称为主语从句。
二、主语从句的引导词1. that引导主语从句时，在句中不做成分，一般不省略。
It is true that the earth goes around the sun.地球围绕着太阳转是真的。
That we will be late is certain.我们无疑是要迟到了。
2. whether/if引导的主语从句Whether or not you can do this well depends on your learning attitude.你是否能做好这件事取决于你的学习态度。
It doesn’t matter whether you like Chinese food.你是否喜欢中餐不重要。
I don’t care if you won’t come.我才不在乎你来不来呢。
*whether引导的主语从句可置于句首或句末;if引导的主语从句只能置于句末。
两者均可用it做形式主语。
3. 连接代词引导的主语从句who、whom、whose、what、which、whoever、whatever、whichever引导的主语从句Who we should defeat is nobody but ourselves.我们需要战胜的只有我们自己。
(2010年湖北武汉)What we need is love and caring.我们需要的是爱和关怀。
(2008年山东青岛)4. 连接副词引导的主语从句when、where、how、why、whenever、wherever 引导的主语从句Why he wants to join the club is he wants to make more friends.他想加入俱乐部的原因是他想交更多的朋友。
初中英语主语从句
Whoever makes mistakes must correct them.
凡犯了错误的人都必须改正。
Subject Clause
1.用作主语的从句叫主语从句，它是名词性从句之一。
注意: 上述例句中的主语从句都是放在句首, 但有时为
了使句子结构平衡, 避免 “头重脚轻”, 常用 it 作形
astonished everybody present
3. _W__h_e_th_e_r_ the 2000 Olympic Games will
be held in Beijing is not known yet.
4. _W__h_e_th_e_r_ we’ll go camping tomorrow
accepted as an international language.
7.It worried her a bit _t_h_a_t her hair was
turning grey.
8. The Foreign Minister said, “_I_t is our
hope that the two sides will work towards peace.”
depends on the weather.
Pop Quiz
Complete the sentences
with a suitable word.
5. _W__h_o_e_v_er_ leaves the room last ought
to turn off the lights.
6. _I_t_ is a fact that English is being
Subject Clause
英语主语从句语法详解
如何正确使用英语主语从句一、主语从句的概念和特点主语从句是指在句子中充当主语的从句，即表示句子的主体或说话者的观点、想法、感受等的从句。
主语从句可以直接位于主语的位置，也可以由形式主语it代替，而将从句放在句子末尾。
主语从句要用陈述语序，即主语在前，谓语在后，不用倒装或省略。
主语从句后的谓语动词用第三人称单数，与从句的主语无关。
例如：What he said is true. 他说的是真的。
（主语从句直接位于主语的位置）It is true that he said so. 他说的是真的。
（主语从句由形式主语it代替，放在句子末尾）Whether he will come is not certain. 他是否会来还不确定。
（主语从句要用陈述语序，不用倒装）The fact that he is late worries me. 他迟到的事实让我担心。
（主语从句后的谓语动词用第三人称单数，与从句的主语无关）二、主语从句的引导词和用法主语从句通常由以下几类词引导：从属连词：that, whether等。
that通常只起连接作用，无实际意义，有时可以省略。
whether表示是否，后面可以跟or not。
例如：That he is honest is known to all. 他诚实是众所周知的。
（that可以省略）Whether he will come or not is not certain. 他是否会来还不确定。
（whether表示是否，后面跟or not）连接代词：who, whom, whose, which, what等。
连接代词在从句中充当主语、宾语、定语等成分，有实际意义，不能省略。
例如：Who will go with you is not decided yet. 谁将和你一起去还没有决定。
（who在从句中充当主语）What he needs is more practice. 他需要的是更多的练习。
英语的主语从句
主语从句：在句子中担当主语的是一个从句，这个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”。
一、主语从句的引导词主语从句通常由连词that和whether、连接代词或连接副词以及关系代词型what引导。
1. that引导例句：That you are coming to London is the best news I have heard this long time. 你将来伦敦是好久以来我听到的最好消息。
2. whether引导例句：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
3. 连接代词引导例句：Whoever is top from wins the game when two matched players meet. 两强相争勇者胜。
4. 连接副词引导例句：How this happended is not clear to anyone. 这件事怎样发生的，谁也不清楚。
5. 关系代词型what引导例句：What struck me was that they have all suffered a lot. 给我很深印象的是他们都受过很多苦。
二、主语从句与形式主语it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。
这分三种情况：(1) 对于以连词that引导的主语从句，通常用形式主语代主语从句：例句：That they should refuse to sign the petition required great courage. 他们拒绝在请愿书上签字这是需要很大勇气的。
(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：例句：Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
中职英语：主语从句与表语从句
Unit 7主语从句与表语从句一、主语从句主语从句是在复合句中担任主语的句子。
其特点有：（1）引导词：从属连词that, whether；连接代词who, what, which；whoever, whatever, whichever;连接副词when, where, how和why。
（2）语序：陈述句语序（3）在主语从句中只能用whether，不能用ifThat he will win the match is certain.It is certain that he will win the match.1. 一般来说主语从句都是放在句首，但有时为了使句子保持平衡，避免"头重脚轻"，常用it作形式主语，从而把主语从句放后面。
常以it作形式主语的句型有：①It is＋形容词＋that...It is certain that she will do well in her exam.毫无疑问她考试成绩会很好。
②It is＋名词词组(no wonder，an honour，a good thing，a pity，no surprise，common knowledge，a surprise，a fact，etc. )＋that...It’s a pity that we can’t go.很遗憾我们不能去。
③It is＋过去分词(said，reported，thought，expected，decided，announced，arranged，etc. )＋that...It has been suggested that much should be done to prevent the river from being polluted.有人建议应做更多的工作阻止河流遭受污染。
④It appears/seems that...|It happens that...|It occurred to me that...|It turned out that...It turned out that nobody remembered the address.结果发现没人记得这地址。
四级作文主语从句模板范文
四级作文主语从句模板范文主语从句模板范文。
在英语写作中，主语从句是一种非常常见的句型。
它可以使句子更加丰富多彩，也更加地道。
下面我们就来看一些主语从句的模板范文。
1.主语从句模板范文一。
It is important that + 从句。
重要的是……。
例句，It is important that we should protect the environment.2.主语从句模板范文二。
It is necessary that + 从句。
必要的是……。
例句，It is necessary that we should learn to work independently.3.主语从句模板范文三。
It is natural that + 从句。
自然的是……。
例句，It is natural that we should feel tired after a long day's work.4.主语从句模板范文四。
It is suggested that + 从句。
建议……。
例句，It is suggested that we should eat more fruits and vegetables.5.主语从句模板范文五。
It is believed that + 从句。
人们相信……。
例句，It is believed that exercise is good for our health.6.主语从句模板范文六。
It is known that + 从句。
众所周知……。
例句，It is known that smoking is harmful to our health.7.主语从句模板范文七。
It is reported that + 从句。
据报道……。
例句，It is reported that the company will launch a new product next month.8.主语从句模板范文八。
英语语法句子主语从句
英语语法句子主语从句在句子中起名词作用的各种从句，通称为名词从句。
根据它们在句子中的作用，这类从句分别称为主语从句、表语从句、同位语从句。
主语从句可置句首，也可用it 作形式主语，而将从句置句末，如何学好英语?小编在这里整理了相关资料，快来学习学习吧!英语语法句子主语从句一、主语从句的概念与类型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.例如:That she was chosen made us very happy.她当选了使我们很高兴.What caused the accident is a completemystery.是什么导致了这次事故还完全是一个谜.Whether she will come or not is still a question.她是否来还是一个问题.Which team will win the match is stillunknown.哪个队会赢得这场比赛还不知道.Whoever comes to the party will receive apresent.参加聚会的每一个人都将收到一份礼物.When they will start has not been decidedyet.他们何时出发还没决定.注意:上述例句中的主语从句都是放在句首,但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.例如:It is a pity that she has made such amistake.她犯了这样一个错误,真是遗憾.It depends on the climate whether they aregoing shoppingtoday.他们是否今天去购物还得看天气情况.这样就构成了下面一些常用句型:1)It is + adj. / n. +从句It is a pity/shame that...遗憾的是……It is possible that...很可能……It is unlikely that...不可能……2)It +不及物动词+从句It seems/appears that...似乎……It happened that...碰巧……3)It + be +过去分词+从句It is said that...据说……It is known to all that...众所周知……It is reported that...据报道……It is believed that...据信……;人们相信……It is suggested that...有人建议……It must be pointed out that...必须指出……It has been proved that...已证明…….例如:It is believed that at least a score ofbuildings were damaged or destroyed.据信,至少有二十座楼房遭到破坏或彻底毁掉.It is suggested that the meeting should beput off.有人建议会议延期召开.It's reported that three people were killedin the accident and five were hurt badly.据报道,事故中三人丧生,五人重伤.It is known to all that Taiwan is aninseparable part of China.众所周知,台湾是中国不可分割的一部分.巩固练习1. Does_______ matter if he can't finish the job on time?A. thisB. thatC. heD. it2. It worriedher a bit _______ her hair was turning grey.A. whichB. thatC. ifD. for3. _______ isa fact that English is being accepted as an international language.A. ThereB.ThisC. ThatD. It二、学习主语从句应该注意的几个问题1)引导词that与whatwhat既有引导主语从句的作用,同时又在从句中作句子成分(主语、宾语、表语等).这时what相当于all that/everything that...,常译成"所……的(东西、事情、话等.)";而that只起连接作用,本身无实际意义,在从句中也不担当任何句子成分.但that引导的主语从句放在句首时,不能省略that.例如:What is done can't be undone.(谚语)已成定局,无可挽回.What we can't get seems better than what wehave.我们得不到的东西似乎比已得到的要好. That we should work out a plan to deal with the present serioussituation is important.我们应该制定一项计划来应付目前严峻的形势,这一点非常重要.That a new teacher will come to teach usgeography is true.一位新老师将来教我们地理,这是真的.巩固练习4. _______what they told me really true?A. HasB. IsC. DoesD. Have5. It matterslittle _______ a man dies, but _______ matters much is _______ he lives.A. how; what;howB. how; it; howC. why; it; whyD. that; what; that6. _______ shecouldn't understand was _______ fewer and fewer students showed interest in herlessons.A. What; whyB. That; whatC. What; becauseD. Why; that7. It ispretty well understood _______ controls the flow of carbon dioxide in and outthe atmosphere today.A. thatB. whenC. whatD. how8. _______ fashion differs from country tocountry may reflect the cultural differences from one aspect.A. WhatB. ThatC. ThisD. Which9. -What made her parents so angry? - _______ she had failed in the examination. A. As B. Because C. Since D. That2)引导词if和whetherif和whether引导动词后的宾语从句时一般可通用,但介词后的宾语从句、主语从句(放在句首时)、表语从句常由whether引导.例如:Whether she will go home or not is unknown.她是否回家还不得而知.Whether we shall raise ducks or geeseremains to be decided.我们是养鸭还是养鹅仍没决定.It remains to be decided whether/if we shall raise ducks orgeese.但我们不能说If we shall raiseducks or geese remains to be decided.巩固练习10. _______we'll go camping tomorrow depends on the weather.A. IfB.WhetherC. ThatD. Where3)其它引导词连接代词who, which, whom,whose有各自的意义,起连接作用,并在从句中充当语、宾语、表语、定语等;连接副词when,where, why,how等有各自的意义,起连接作用,并在从句中充当状语.巩固练习11. -Do youremember _______ he came? -Yes, I do. He came by car.A. howB. whenC. thatD. if12. It was amatter of _______ would take the position.A. whoB.whoseC. whomD. whomever13. -I droveto Zhuhai for the air show last week. -Is that _______ you had a few days off? A. why B. when C. what D. where14. I readabout it in some book or other, does it matter _______ it was?A. whereB.whatC. howD. which三、语气在It is necessary / natural/ important / strange...+ that-clause 这类句型里,that所引导的主语从句中谓语动词用"should+原形",表虚似语气.例如:It is necessary that the problem should besettled at once.这个问题必须马上解决.It's strange that he should have gone awaywithout telling us.他竟然没向我们说一声就走了,真是奇怪.巩固练习15. It isnecessary that a college student _______ at least a foreign language.A. mastersB.should masterC. masteredD. will master四、以it作形式主语的主语从句与强调句型的区别"It be + adj./n. + that-clause"与强调句型均有It be...that...之类的语言标志,但不同的是:①前者中的that从句是主语从句.若删掉其中的It be和that,则剩余部分不论结构还是语意都不能成为一个句子;但若将后者中的It be和that去掉,则剩余部分的结构和语意仍能构成一个完整的句子.②强调句型译为汉语时可加上"正是……"或"就是……"之类的字眼,而主语从句则不可以.请比较下面两个句子:It is surprising that Mary should have wonfirst place.令人惊奇的是玛莉竟然获得了第一名. It is Mary that has won first place.正是玛莉得了第一名.第一句话中的It是形式主语,that引导的是主语从句.句中的It is和that无法删除,一旦删除句子就不成立.第二句是强调句型,其中的It is和that可以去掉,因为没有It is和that句子仍然很通顺.主语从句<例句>It's certain that prices will go up.物价肯定要上涨的。
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主语从句（一）主语从句的标记主语从句通常由连词that和whether (if)、连接代词或连接副词以及关系代词型what引导。
1. that引导That he is still alive is a wonder. 他还活着，真是奇迹。
That we shall be late is certain. 我们要晚了，这是确定无疑的。
That he should have ignored the working class was natural. 他忽视工人阶级是很自然的。
That she is still alive is a consolation. 她还活着是使人感到宽慰的。
That she became an artist may have been due to her father’s influence. 她成为画家可能是受她父亲的影响。
That you are coming to London is the best news I have heard this long time. 你将来伦敦是好久以来我听到的最好消息。
That she was chosen made a tremendous stir in her village. 她被挑选上，在她村子里引起很大轰动。
2. whether引导Whether it will do us harm remains to be seen. 是否对我们有害还要看一看。
Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
3. 连接代词引导Whoever (=anyone who) fails to see this will make a big blunder. Whatever(=anything that) she did was reasonable. 无论什么Anything that she did was reasonable.Whichever (of you) comes in first will receive a prize. 无论(你们)谁先到都可以得奖。
Whichever(=anything that) you want is yours. 你要哪个哪个就是你的。
What do you need?What you need is a good rest. I don’t know what you need?4. 连接副词引导When we arrive doesn’t matter. 什么时候到没有关系。
When do we arrive? How it was done was a mystery. 这是怎样做的是一个谜。
How was it done? How this happened is not clear to anyone. 这件事怎样发生的，谁也不清楚。
How did this happen? How many people we are to invite is still a question. 邀请多少人还是一个问题。
How many people are we to invite? Where I spend my summer is no business of yours. 我在哪里过暑假不关你的事。
Where do i spend my summer? 5. 连接代词型what引导What(=the thing that) we need is money. 我们需要的是钱。
What do we need? What I want to know is this. 我想知道的就是这一点。
What’s done is done. 事已成定局。
What=the thing that he says is not important. 他说的话并不重要。
What does he say? What I am telling you is mere impressions. 我和你说的都不过是一些印象而已。
What make the river more beautiful are the lotus plants growing in the water. 为河水增色的是水里的荷花。
What you need is a good-sized canvas bag. 你需要的是一个比较大的帆布袋。
What I am afraid of is their taking him to Portugal. 我担心的是他们把他带到葡萄牙去。
What struck me was that they have all suffered a lot. 给我很深印象的是他们都受过很多苦。
（二）连接词的选用 1. that和what的选用that和what都可引导主语从句。
what除起连接作用外，还在名词性从句中充当某些成分，可作从句的主语、宾语或表语。
而that在名词性从句中不充当任何成分，无词义，只起连接词作用。
如：What he wants is a book. 他想要的是一本书。
That light travels in straight lines is known to all. 众所周知，光线沿直线运行。
2. if和whether的选用引导主语从句，不能用if，只能用whether。
如：Whether we will hold a party in the open air tomorrow depends on the weather. 我们明天是否在户外开晚会要看天气而定。
3. 其它连接代词和副词的选用根据主语从句的具体意义，正确的选择who, which, when, where, why, how等连接词，这些连接词既有疑问含义，又起连接作用，同时在从句中充当各种成分。
如：When we shall hold our sports meet is not decided. 我们何时举行运动会还没有决定。
Who broke the glass yesterday is not clear. 还不清楚昨天谁打破了玻璃。
Which car you will choose to buy makes no difference. 你决定买哪一辆车都不会有任何区别。
4. 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. ） 5. it构成的主语从句（1）由连词that引导的主语从句，在大多数情况下会放到句子的后面，而用代词it作形式主语。
如：It is well-known that the earth moves around the sun. 众所周知，地球围绕太阳转。
需要注意的是，it作形式主语代替主语从句时，要注意和as引导的定语从句的区别。
试比较：It was reported that the US was under the terrorist attack. （主语从句，有that，无逗号）As was reported, the US was under the terrorist attack. （定语从句，无that，有逗号）上两句意为“据报道，美国遭到恐怖分子的袭击”。
（2）常见用it作形式主语的复合句结构It is a fact （a good idea / a pity / a shame / no wonder / good news…）that…如：It’s a pity that you missed the film. 你没有看那部电影真是太遗憾了。
It is necessary （clear / true / strange/ important /wonderful / possible / likely…）that…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。
如：It is necessary that you （should）master the computer. 你很有必要掌握电脑。
It is important that a student learn English well.学生学好英语很重要。
It’s clear that they badly need help. 很明显，他们急需援助。
It is likely that a hurricane will arrive soon. 飓风很可能马上就要到达了。
It is reported （well-known / hoped / thought / expected /said /believed/decided /suggested /ordered…）that …如：It is said that he was killed in the earthquake. 据说他在地震中丧生了。
It seems （happened / appears / doesn’t matter / makes no difference / …）that …如：It seems that they will win the game. 看起来他们好像会赢得这场比赛。
It makes no difference whether he will attend the meeting or not. 他是否会参加会议都无关紧要。
巩固练习1._________you have done might do harm to other people. 2. ________ leaves the room last ought to turn off the lights. 3. ________ the Games will be held in Beijing is not known. 4. It worried her a bit _______ her hair was turn ing grey. 5. ________ you don’t like him is none of my business. 6. _________ he said at the meeting astonished everybody present. 7. _________ is a fact that English is accepted as an international language. 8. ________we can’t get seems better than _______ we have. 9. _________ we’ll go camping tomorrowdepends on the weather. 10. ________ caused the accident is still a complete mystery. 11. _______ has helped to save the drowning girl is worth praising.12. makes this shop different is that it offers more personal名词性从句---主语从句定义在复合句中充当主语成分的句子叫做主语从句.名词性从句(主语从句、宾语从句、表语从句和同位语从句) 中的连接词连词: that / whether / as if (though); 连接代词: what / who/ which / whose / whatever / whoever / whomever / whichever，连接副词: where / when / why / how / wherever / whenever 第一部分常规主语从句，即句子在复合句中充当一个主语主语从句的时态：不受主句的时态影响和限制。