it 做形式主语引导的主语从句和作强调句型的区别

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it is …that的主语从句

it is …that的主语从句一、“It is...that”主语从句的结构与用法1. 基本结构- 在“It is...that”结构的主语从句中，it是形式主语，真正的主语是that引导的从句。

例如：It is important that we study hard.（我们努力学习是很重要的。

）这里“that we study hard”是真正的主语，it只是形式上占据主语的位置，使句子结构平衡，避免句子“头重脚轻”。

2. that的特点- that在主语从句中无实际意义，不充当句子成分，但不能省略。

这一点与宾语从句中that有时可省略有所不同。

例如：It is a fact that the earth goes around the sun.（地球绕着太阳转是一个事实。

）3. 常见的it is后面的成分- 形容词- 当it is后面接形容词时，表示对某事的一种评价或描述。

例如：It is necessary that we should protect the environment.（我们应该保护环境是必要的。

）常见的形容词还有important（重要的）、obvious（明显的）、strange（奇怪的）等。

- 名词- 如果it is后面接名词，这个名词往往是对后面主语从句内容的一种概括。

例如：It is a pity that he missed the train.（他错过了火车真是遗憾。

）其他常见名词如fact（事实）、truth（真相）、good news（好消息）等。

二、主语从句中语序与时态的注意事项1. 语序- 主语从句要用陈述语序。

例如：It is uncertain whether he will come.（他是否会来还不确定。

）而不能写成It is uncertain will he come。

2. 时态- 时态要根据具体语境来确定。

如果主句是一般现在时，从句可以根据实际情况使用各种时态。

高考语法it用法详解

一. it作人称代词在特定的环境中，it可指人，如指婴儿、性别不详或身份不明的人。

e.g.1. The baby stopped crying as soon as it saw the woman.（指婴儿）2. —Who is it?—It’s me.（性别不详或身份不明）二. it作形式主语或形式宾语it可以作形式主语或形式宾语而把真正的主语或宾语后置。

1. 用it作形式主语的情况：(1) It＋系动词＋形容词＋that从句It is necessary/important/surprising/strange＋that从句，从句中谓语动词常用“should＋动词原形”形式，且should可省略。

(2) It＋系动词＋名词＋that从句It is a pity/a shame/good news/a fact/an honour/a wonder/no wonder/our duty＋that从句。

e.g. It’s no wonder that you’ve achieved so much success.难怪你取得了如此大的成功。

(3) It＋不及物动词＋that从句It seems/happened/turned out /occurs/appears＋that从句。

e.g. It happened that he was out when I called on him.当我去拜访他的时候，碰巧他出去了。

(4) It＋系动词＋过去分词＋that从句It is said /reported/ announced/ believed/ thought/ well known/ hoped/ pointed out/ found out/ suggested/ ordered/ advised/ requested/ insisted/ required/ demanded＋that从句。

“It”作形式主语和形式宾语的用法详解

it作形式主语和形式宾语it既可作人称代词，用来表示动物或无生命的物体等，也可以作无人称代词，在句中作主语，表示“时间”、“距离”、“天气”等。

它还可以引导强调句，使语气得以加强。

此外，it在句中能作引导词，充当句子中的形式上的成分，如形式主语、形式宾语等。

㈠it作形式主语：it作形式主语时没有具体的意义，而只是帮助把真正的主语移到句子后部去，使句子显得平稳一些。

it作形式主语时，可以代替三种形式：不定式、动名词和主语从句。

1. it代替不定式短语常用于下列句型中：It + be +形容词+ (for/of sb.) to do sth.It + be + 名词+ to do sth.It takes sb. some time to do sth. 干…花了某人…时间It’s up to sb. to do sth. 干…是某人的职责或义务如：①It is everyone’s duty to obey the law.遵守法律是每个人的义务。

（it作形式主语, 代替不定式短语to obey the law）②It is difficult for a foreigner to learn Chinese.对于一个外国人来说，学习汉语是困难的。

（it作形式主语, 代替不定式短语to learn Chinese）③It is not right to use these places as rubbish dumps.把这些地方用来倒垃圾是不对的。

（it作形式主语, 代替不定式短语to use these places as rubbish dumps）④It took them a year to build the bridge.建这座桥花了他们一年的时间。

（it作形式主语, 代替不定式短语to build the bridge）⑤It is bad manners to stare at people.瞪着眼睛看人是不礼貌的。

it做形式主语的主语从句结构

it做形式主语的主语从句结构在学习英语时，我们常会碰到“it”作为形式主语的句子，这种结构其实不难掌握，但初学者可能会觉得有点拗口。

今天，我们就来深入了解一下“it”作为形式主语的用法吧！1. 什么是形式主语？首先，我们需要搞清楚什么是形式主语。

简单来说，形式主语就是“it”在句子中起到的作用。

其实，“it”本身并不指代任何具体的事物，而是为了让句子结构更清晰、更自然。

大家可以把它当作一个“占位符”，直到我们真正找到句子的“真正主角”。

1.1 形式主语的基本结构我们可以用一个简单的例子来理解：“It is important to finish your homework.” 在这个句子里，“it”就是形式主语，而真正的主语是“to finish your homework”。

换句话说，我们用“it”来引导读者注意到后面的内容。

1.2 为什么要用形式主语？那为什么不用直接说“Finishing your homework is important”呢？其实，形式主语让句子听起来更自然、更容易理解，尤其是当真正的主语比较长或复杂时。

这就像是给句子一个“热身”时间，让读者在进入正题之前，先对句子的结构有个大致的了解。

2. 形式主语的用法接下来，我们来看看一些常见的情况，什么时候需要用形式主语“it”呢？2.1 当从句作为主语时当句子的主语是一个从句时，我们通常会用“it”来代替。

比如说：“It is clear that he is very talented.” 在这个例子中，“It”替代了“that he is very talented”这个从句，让句子更流畅、更易于理解。

2.2 当不定式或动名词作为主语时同样的，当句子的主语是一个不定式（to do something）或动名词（doing something）时，我们也会用“it”作为形式主语。

例如：“It is difficult to master a new language.” 这里，“It”替代了“to master a new language”，使得句子结构更加简洁明了。

it 句型总结

浅谈It 强调句型的判定及与其它易混句型的比较It引导的强调句型是一个非常重要的句型，在实际应用中我们可以通过该句型对句子的主语（含主语从句），宾语（含宾语从句）和状语（含状语从句）加以强调，从而提高语言的表现力。

It强调句型主要有三种：（1）陈述句：It is/was +被强调部分+that/who/whom+句子其他成分(其他成分用陈述语序）；（2）一般疑问句：Is/Was+it+被强调部分+句子其他成分？（3）特殊疑问句：疑问词+is/was+it+that+句子其他成分？随着学习的深入，学生在经过一定的训练和积累之后，往往会对it强调句型和一些相似句型混为一谈。

本文拟就强调句型的一般判定及与一些相关句型的比较进行较为深入的整理，以期对学生的进一步学习起抛砖引玉的作用。

一It强调句型的一般判定方法如何判定一个句子是否是强调句型非常重要，下文所整理的强调句与易混句型的比较，无一不涉及到强调句型的判定方法。

我们只要掌握了强调句型的判定方法，就可非常容易地辨别强调句型与非强调句型。

判定方法（一）：看It is/was...后的引导词。

一般而言，若It is/was...之后是that/who/whom，则为强调句；若为其他的引导词如when,where,why,which,before,since等，则为非强调句。

请看下列例句：（1）It was in the room that we met for the first time. (2) It is his little son that/who/whom the father worries about most. (3) It was already midnight when I finished my composition. (4) It was the museum which we visited last Sunday. (5) It is the school where I used to work. (5) It is the reason why I wasn't able to come here last night.根据判定方法，（1），（2）为强调句，（3），（4），（5）为非强调句，请留意划线词。

语法专题：It的用法

语法专题：It的用法一、考情分析与命题趋势综观近几年的高考英语试题，it句型的考查频频出现，成为比较重点的知识点。

以下我们结合历年高考试题，将it的常见考点作一归纳分析。

试题注重情景的设置，需要利用特点语言环境中上下文的联系，正确分析结构，理解句意是做此类题目的关键。

命题的热点集中于以下几个方面:1. it/that/one用法区别。

2. 作形式主语或形式宾语（主要代替v-ing,，to do或从句）。

3. 用于强调句或固定句型（it is/was…when/since/before…）中。

4. 考查it 构成的习语，it也常表示抽象的情况,属于虚指. 如:Take it easy。

二、it的用法总结（一）作人称代词(1) 代替前面或后面提到过的东西或事情。

This is a new dictionary. I bought it yesterday. Although we cannot see it, there is air all around us.Tom joined the army last mouth. Do you know about it? They say he has left town, but I don't believe it. (2) 代替指示代词，起着this或that的作用。

—Is this your car? —No, it isn’t.—What’s that?—It’s a video—Whose room is this? — It is theirs.(3) 用来指身份不明的人，还可指不明性别的婴儿。

—Who’s there?—It’s me. (It’s John)—Go and see who it is that rings. —It’s Bill.—Someone is knocking at the door, Peter. Who is it? —It's me.—Who are singing? — It is the children.—The light is still on in the lab. — It must be the third-year students doing the experiment.The Green s have a new baby. It’s lovely.The baby cried because it was hungry.(4) it与one的区别：这两个词都可以代表前面说过的名词，但it用于同名同物的场合；one则用于同名异物的场合，相当于a/an+单数名词，表泛指概念。

“it”引导主语从句和“it”做形式主语还有强调句型的区别分别是什么？

“it”引导主语从句和“it”做形式主语还有强调句型的区别：it引导的主语从句，形式主语就是it，真正的主语在句子的后面，通常是to do的不定式短语。

而强调句的结构
it is/was+被强调部分+that/who+句子其余部分，结构词it is/was和that/ who都是没有实际意思的，只是构成句子结构的词而已。

这个强调句只能强调名词和代词，也就是主语和宾语，不能强调其他句子成分。

主语从句：It is kind of you to help me with my housework.
强调句：It is you who help me with my housework.
主语从句中it做形式主语的常见句型：It+be+形容词+主语从句，如：It is u ncertain whether he can come to Jenny’s birthday party or not. It + be + 名词词组+ 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：
It’s a pity that you missed the exciting football match.
It remains a question whether he will come or not.
It + be + 过去分词+ 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等，如：It is reporte that 16 people were killed in the earthquake.。

名词性从句基本用法及考点归纳

名词性从句基本用法及考点归纳孝昌一中郭小青对名词性从句的考查是湖北卷完成句子试题很重要的一个部分，查看近几年的湖北高考完成句子都将名词性从句作为各种从句的必考点。

如：2007年湖北省高考题1:I haven’t the slightest idea(他正在说什么).(talk)此题考查宾语从句、现在进行时和动词短语，答案是（of）what he’s talking about 2007年湖北省高考题2：The fact __（他失败了数次）makes him very upset (he, fail)此题考查同位语从句和现在完成时，答案是that he has failed (for) several times 2007年湖北省高考题3：(他是否出过国)doesn’t make much difference.(he, abroad)此题考查主语从句和现在完成时，答案是Whether he has been abroad or not 2008年湖北省高考With the rapid development of science and technology，I can’t imagine_____________ (我的家乡会是什么样子) in ten years. ( what)此题考宾语从句，答案是what my hometown will be/look like 注意用将来时且是陈述语序2010年湖北高考The news______________ (房价将要下跌) has caused many people to sell their houses at lower prices.此题考同位语从句，用“that” 引导，“房价”译成“housing price”，答案是“that the housing price will fall”。

从中可看出，虽然对名词性从句的考查比重在下降，2007年有3道题涉及名词性从句的考查，而2008年，2009年只有一题，，但2010年还是再次考查了名词行从句中的同位语从句。

It的用法和强调

It is a pity that such a thing ( should ) happen in your class. 这种事竟然发生在你们班上，真是遗憾！
It is a pity that he is ill. 他生病了，真遗憾！
5. It happens (seems， looks， appears ) that... 该句型中it是形式主语，that 引导的是主语从句，主句中的happen ， seem等词是不及物动词。
It took thousands of people many years to build the Great Wall.
3. 作形式主语替代ing形式 It is no good (use ) doing sth. 该句型中的真正主语是动名词短语，主句中的表语可以是no good ， ( not any good ) ， no use ， ( not any use )。
在①中的形容词作表语可以用从句改写，如：
It is important for her to come to the party. = It is important that she (should ) come to the party.
2.It takes sb. ... to do sth. 该句型中的不定式是真正的主语， it是形式主语，句型中的直接宾语是时间，常译为＂做…… 要花费某人……＂。
②It is suggested ( ordered /demanded/insisted/commanded... ) that ... 该句型和上一个同属一个句型，主句中的过去分词是表示请求，建议，命令等词时，that 后的从句要用虚拟语气（should + 动词原形），should 可以省；常译为＂据建议；有命令．．．） It is suggested that the meeting ( should ) be put off. It was ordered that we ( should ) arrive there in two hours.

强调句和各从句的区别

一、定语从句与名词性从句句式结构用法比较定语从句常易与主语从句、表语从句、宾语从句和同位语从句等名词性从句相混淆。

判断的方法是：由关系代词或副词引起的句子直接充当句中某一成分，即为名词性从句；如果这个句子修饰前面的一个名词即先行词或指代整个句子的内容，即为定语从句。

例1. (1) As is known to everyone, the moon travels round the earth once every month. (2) It is known to everyone that the moon travels round the earth once every month. 比较：(1)两个句子之间有连接词，而且由逗号分隔。

根据前一分句意义“正如大家所知道的(众所周知)”分析，该句应用关系代词as引导非限制性定语从句，指代主句整个句子内容。

(2)两个句子之间有连接词that连接。

根据句意分析，that所引起的从句为主语从句，故该句应选用it作形式主语置于句首，引导主语从句。

例2. (1)Shenzhen is no longer what it used to be. (2) Shenzhen is no longer the place that it used to be. 比较：(1)句中没有充当表语的名词，故应选用代词what(……样子)引起一个表语从句。

(2)句中表语名词the place 被it used to be所修饰，且充当其句中表语。

故应选用关系代词that指代先行词the place引起一个定语从句。

例3. (1) Please tell me the reason why he didn't attend the meeting. (2) Please tell me why he didn't attend the meeting. 比较：(1)句中充当宾语的名词the reason被he didn't attend the meeting所修饰，且充当句中的原因状语。

强调句型和it的用法

强调句型It is (was) +被强调部分+ that (who)+ 句子其他部分。

1.It is + 被强调部分+ that ...该句型是强调句型。

将被强调的部分放在前面，其它部分置于that之后，被强调部分可以是主语，宾语，表语或状语，强调的主语如果是人，that可以由who换用。

如果把这种句型结构划掉后，应该是一个完整无缺的句子；这也是判断强调句型与其它从句的方法。

It was they that (who) cleaned the classroom yesterday. It was in the street that I met her father.2. It is not until + 被强调部分+ that ...该句型也是强调句型。

主要用于强凋时间状语，译成汉语“直到…才…＂，可以说是not ... until ... 的强调形式。

It was not until she took off her dark glasses that I realized shewas a famous film star.= Not until she took off her dark glasses did I realize she was= I didn’t realize she was a famous film star until she took off3. 强调句型的句式变换1）强调句型的一般疑问句形式句式特征：Is/ Was it +被强调部分+ that…2）结合特殊疑问词构成特殊疑问句形式句式特征：特殊疑问词+is/was it that…？•例句：•How is it that she turned down our help? 什么原因使得…？•Where was it that you met Tom yesterday? 究竟在哪…？•When was it that you met him in the park? 究竟何时…？•When and where was it that you got to know Mary? 究竟在何时何地…？•Who was it that that came up with the bright idea? 究竟是谁…？•Which book is it that you want to buy? 究竟是哪一本书…？•Whose umbrella was it that you took away? 到底是谁的伞…？3）在强调句型中考察主谓一致与比较结构。

英语中it用法全解析

英语中it用法全解析摘要本文主要介绍了英语中it的用法，包括以下几个方面：it作为人称代词，指代前文提到的或语境中明确的人或物。

it作为非人称代词，表示天气、时间、温度、距离等抽象概念。

it作为形式主语或形式宾语，代替不定式、动名词或从句等真正的主语或宾语。

it用于强调句型，突出句子中的某一成分。

it用于其他常见的句式和短语，表达不同的意思和功能。

1. it作为人称代词it作为人称代词，通常指代前文提到的或语境中明确的人或物。

它在句中可以作主语、宾语、定语或表语等。

例如：句子说明He took a quick look at the house and noticed it was veryold.it指代前文提到的house，作主语。

John hates children, and it is difficult to say why.it指代前面提到的事情，作主语。

She made it clear (that) we were not welcome.it作形式宾语，真正的宾语是that引导的从句。

It's me.it作形式主语，真正的主语是me。

2. it作为非人称代词it作为非人称代词，表示天气、时间、温度、距离等抽象概念。

它在句中通常作主语或宾语。

例如：句子说明It is raining.it表示天气，作主语。

It is an hour's walk from my home to the school.it表示距离，作主语。

It is a pity that I didn't think of it earlier.it表示一般情况，作主语。

I don't like it when you are angry.it指代后面的when引导的从句，作宾语。

3. it作为形式主语或形式宾语当不定式、动名词或从句等用作主语或宾语时，为避免头重脚轻或保持句子平衡，通常在句首使用形式主语或形式宾语it，而把真正的主语或宾语置于句尾。

“It”用法及其句型和固定搭配讲解

“It"用法及其句型和固定搭配讲解“It”用法及其句型和固定搭配，是高中英语语法的重点、难点，又是近几年高考的热点,因此应给予充分的重视，现将it用法归纳如下：一、It用作实词表达以下概念：指代前文提到的事物,前文中的this，that；替代前文中的内容；指代一位性别不明的小孩或未知的人；指代未指明但谈话双方都知道的那件事；指代时间、天气、气候、距离等自然现象……二、It用作形式主语替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾.It 作形式主语的常见句型：1. 代作主语的动词不定式,其句型为（1）It be adj.（for sb。

）to do sth。

此处adj。

通常为描述事件的形容词：easy，difficult，hard，necessary，unnecessary，possible，impossible，likely，unlikely，right，wrong，important，unimportant，legal，illegal,well —mannered，ill-mannered，polite，impolite,clear，obvious，certain，suitable,proper，fit，useful，useless,dangerous…例It is illegal（for a teenager）to drive a car without a license.（2）It be adj。

of sb. to do sth。

此处adj. 通常为描述人的形容词：kind，unkind,nice，rude，cruel，considerate,thoughtful，thoughtless,careful，careless，silly，foolish，stupid，clever，wise,crazy.例It’s kind of you to help me with the problem。

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)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…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。

暴风苏公式化语法：第六章：It’s…thatwho强调句及it的其他用法

第六章：It’s…that/who强调句及it的其他用法强调句的形式比较简单，无非就是将要强调的部分用It’s…that/who 夹起来，但是如果和其他的句式想结合就不那么简单了。

这也是高考青睐强调句的原因所在。

第一节：基本结构It’s …that/who 是英语中用语法手段对句中除谓语以外的某一成分进行强调的一种方法。

它的形式比较简单，只要把要强调的部分夹在It’s…that/who中间，其他部分照抄跟在后面。

1.强调主语。

I met Li Ming at the railway station yesterday.It was I that (who) met Li Ming at the railway station yesterday.2.强调宾语。

I met Li Ming at the railway station yesterday.It was Li Ming that I met at the railway station yesterday.3.强调地点状语。

I met Li Ming at the railway station yesterday.It was at the railway station that I met Li Ming yesterday.4. 强调时间状语。

I met Li Ming at the railway station yesterday.It was yesterday that I met Li Ming at the railway station.5.强调各种从句。

He went to the factory at once because he had a lot of work to do.It was because he had a lot of work to do that he went to the factory at one.(原因状语)6．强调不定式。

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。

强调句与其他从句的区别

强调句与定语从句、名词性从句\时间状语从句的区别1.It was what he meant rather than what he said _________ annoyed me.A. whichB. asC. whatD. that2. It was his nervousness in the interview _________ probably lost him the job.A. whichB. sinceC. thatD. what3. It is the ability to do the job _________ matters not where you come from or what you are.A. oneB. thatC. whatD. it4. It was lack of money, not of effort, _________ defeated their plan.A. whichB. asC. thatD. what5. -----__________ Mr. Bardon changed his mind to take part in the movement?----- After he listened to the speech by Mr. King.A. When didB. When was it thatC. When was thatD. When was it6. ——“How was _________ they discovered the entrance to the underground palace?”——“Totally by chance.”A. it thatB. he thatC. it whenD. he which7. ———What is it _________ his daughter needs most?----- A bike.A. whatB. whichC. thatD. if8. Who was it _________ saved the drowning girl?A. sinceB. asC. thatD. he与疑问词连用构成特殊疑问句和感叹句。

it 做形式主语引导的主语从句和作强调句型的区别

it 做形式主语引导的主语从句和作强调句型的区别但若被强调部分是状语时，则只能用that ，即使指时间、地点、原因等，也不能用when ，where 或because 等替代。

如：It was my sister whom I met in the street yesterday.It was only when I reread his poems recently that I began to appreciate their beauty.It was for this reason that her uncle moved out of New York and settled down in a small village.4 . 注意该句型一般不强调谓语动词强调句型通常强调主语、宾语和状语，一般不强调谓语。

需强调谓语时，要在谓语动词原形前面加上助动词do ，does 或did ，尤其是在祈使句或肯定句中，用来加强语气。

如：Do tell me where on earth you are now! Boys and girls , let me tell you something that does sound strange.To my surprise, he did come here on time last night.5 . 注意区分含有Not until 的倒装结构和强调结构Not until 用于句首时，主语和谓语通常用倒装语序。

如果是复合句，那么主句用倒装语序。

但在“ It is / was not until …. that ”句型中，that 后的主谓不倒装。

如：It was not until she took off her dark glasses that I realized she was a famous film star.本句是由I didn't realize she was a famous film star until she took off her dark glasses 变化而来的。

强调句和主语从句的区别

强调句和主语从句
It 作形式主语和it引导强调句的比较
①主语从句常用it作形式主语，一般常用句型为：It is+{名词/形容词/过去分词}+主语从句例如：
It is still a question whether she will come or not.
It is strange that you should like him.
It is still unknown which team will win the match.
另外，还有一些比较多见的结构：
It turned out that……;
It has been proved that……;
It happened/occurred that……;
It is well-known that……等等
②而强调句则不同，它的结构是：It+be+被强调部分+that+从句
强调主语：It is the times that produce their heroes.时势造英雄
强调宾语：It is English that Prof.Lin teaches us.
强调状语：It was in shanghai that I saw the film.
判断是否是强调句有一个方法，就是将that以后的“句子的其余部分”拿出来单独看，看有没有缺成分，缺的是什么成分，再把谓语动词后面that前面的那部分，带到你认为缺成分的地方，如果放进去是一句完整的句子了，那就说明是强调句。

强调句型定语从句主从和it形式主语句型

定语从句定语从句在‎句中相当于‎一个形容词‎，起定语的作‎用，修饰说明名‎词、代词或主语‎的全部内容‎。

通常在被修‎饰的词语（即先行词）之后，由“关系词”引导。

定语从句的‎三种功能：1.连接功能：连接从句，引导一个定‎语从句2.指代功能：指代先行词‎3.语法功能：在定语从句‎中充当句子‎成分(定语从句中‎的关系词分‎为关系代词‎和关系副词‎两种)that which‎ who whom whose‎ when where‎ why注: 关系代词在‎句中充当主‎语、宾语，因此定语从‎句中不能再‎出现关系代‎词所替代的‎名词或代词‎。

关系代词在‎从句中作主‎语时不能省‎略① A plane‎ is a machi‎n e which‎/ that can fly . (作主语)The dog which‎ / that was lost has been found‎. (作主语)② The numbe‎r of peopl‎e who / that lost homes‎reach‎e d 250,000 .Here comes‎ the girl who / that wants‎to see you .关系代词在‎句中作宾语‎时可省略① The noodl‎es that / which‎I cooke‎d were delic‎i ous .（作宾语）This is the book that / which‎ I want to read .The lette‎r that / which‎I recei‎v ed yeste‎r day was from my fathe‎r .② The girl who / that we saw yeste‎rday is Mary .Mr Li is a man whom / who / that we shoul‎d lear from .Do you know the man whom / who / that is talki‎ng to ?关系代词在‎从句中做定‎语① The novel‎ whose‎cover‎was broke‎n blong‎s to me .② Hener‎y is the boy whose‎mothe‎r is our Engli‎sh teach‎e r . I know the perso‎n whose‎compa‎n y produ‎c es compu ‎t ers .This is the perso‎n whose‎story‎surpr‎i sed every‎b ody .关系代词在‎句中作表语‎时可省略（只能用th‎a t）She is not the girl that she was .定语从句中‎关系代词与‎关系副词的‎选择明确关系代‎词，关系副词在‎定语从句中‎的不同作用‎关系代词w‎hich , that , who在定‎语从句中作‎主语或在及‎物动词或介‎词后作宾语‎关系副词w‎hen , where‎, why在定‎语从句中作‎状语，即定语从句‎中不缺主语‎、宾语，只缺时间、地点或原因‎状语分析句子结‎构，明确句法成‎分〔注〕值得一提的‎是，表示时间“time"一词的定语‎从句只用w‎h en引导‎，有时不用任‎何关系代词‎，当然也不用‎t hat 引‎导By the time you arriv‎e in Londo‎n, we will have staye‎d there‎for two weeks‎.I still‎remem‎b er the first‎time I met her.Each time he goes to busin‎e ss trip, he bring‎s a lot of livin‎g neces‎s itie‎s, such as tower‎s, soap, tooth‎b rush‎etc.当从句的逻‎辑主语是s‎o me, any, no, someb‎o dy, anybo‎d y, nobod‎y, somet‎h ing, anyth‎i ng, every‎t hing‎或noth‎i ng时，常用the‎r e is来引导‎关系词在从‎句中作宾语‎还是作状语‎，关键取决于‎从句中的谓‎语动词。