1it的用法和强调句型
it用作代词的用法
it用作代词的用法一、IT作为代词的基本用法在信息技术（IT）领域中，人们常常使用“it”作为代词，以指代前文提及的某个事物或对象。
它是英语中最常用的代词之一，也是最具灵活性和广泛应用的一个单词。
本文将介绍it作为代词的基本用法，并探讨其在不同语境下的特殊应用。
1.1 人称代词it的基础运用首先，当我们要引用或指代一个已经在上文中提到过的事物时，可以使用“it”来避免重复提及。
比如，“I bought a new car. It is blue.”（我买了一辆新车，它是蓝色的。
）这里，“it”就指代前面提到过的那辆新车。
此外，在特殊问句中，“it”也被广泛应用。
例如，“Who broke the window? Wasit him?”（谁打破了窗户？是他吗？）这里，“it”所表示的含义是找出窗户被谁打破这个问题。
1.2 特殊情况下使用it有许多情况下，在没有明确可指代对象时，我们仍然使用“it”，但此时它不再表示一个具体事物或对象。
例如，在天气描述中，“it”常用来指代天气状况。
“It's raining.”（下雨了。
）“It's sunny.”（阳光明媚。
）这里，“it”没有具体的对应事物，而是抽象地表示天气。
同样，在时间和日期的表达中，我们经常使用“it”。
比如，“What time is it?”（几点了？）“It's three o'clock.”（现在是三点钟。
）二、IT作为代词的高级运用除了基础用法外，"it"还有一些高级运用，需要特别注意其语境和意义的转换。
2.1 强调句型中的it强调句型以“it is/was”开头，并通过强调某一部分来突出信息重要性。
例如：“It was Tom who broke the window.”（打破玻璃窗的是汤姆。
）2.2 待定主语结构当主语没有明确指定时，有时会使用“it”作为占位符。
例如，“It’s important to eat a healthy diet.”（健康饮食很重要。
it作形式宾语和引导强调句的用法小结
it作形式宾语和引导强调句的用法小结
1. IT作形式宾语的用法：
- 当主语是不定式或从句时，可以用it作为形式宾语。
例：I find it difficult to understand this book.（我发现理解这本书很困难。
）
- 当主语是动词的-ing形式时，可以用it作为形式宾语。
例：I enjoy it when you sing.（当你唱歌时，我很享受。
）
2. 引导强调句的用法：
- 强调句一般由以下结构构成：It is + 被强调部分 + that/who + 其他部分。
- 当被强调部分是名词时，用that来引导强调句。
例：It was John who won the competition.（赢得比赛的是约翰。
）
- 当被强调部分是代词时，用who来引导强调句。
例：It was he who broke the vase.（打破花瓶的是他。
）
- 当被强调部分是形容词或副词时，用that来引导强调句。
例：It is very important that you study hard.（你努力学习非常重要。
）
需要注意的是，强调句的语序需要颠倒，被强调部分放在句首。
此外，引导强调句的it没有实际意义，只起连接作用。
It的用法及典型句型归纳. 个人总结
It的用法及典型句型归纳一、人称代词it的最基本用法是作代词，主要指刚提到的事物，想法，以避免重复;也可以指性别不明或性别被认为是不重要的人或动物；未指明但谈话双方都明白的事情或情况。
①They watched the train until it disappeared in the distance.②Is this your dog？No, it isn’t.③I hate it when people talk with a full mouth.．二、.非人称代词.it有时并不指具体的东西而泛指天气、时间、日期、距离、价值、度量、温度、环境等：It is a lovely day, isn’t it? // It was nearly midnight when she came back.It is April First today. // It is some 3000 kilometers from A to B.It is three dollars. // Today it is 30 degrees centigrade.三、作形式主语，替代主语从句，动词不定式，或动名词短语1.作形式主语替代主语从句⑴It is clear ( obvious，true，possible，certain....) that＂┅清楚的（显然的，真的，可能的,肯定的．．．）＂⑵It is important ( necessary，right，strange，natural...) that + (should ) do (虚拟语气)┅是重要的(必要的,对的,奇怪的,自然的┅)⑶It is said (reported/ learned/believed/thought/known/told/hoped.....) that= sb / sth is said (reported/ believed /thought…) to do( to be doing/ to have done) sth＂据说（据报道，据悉．．．）＂。
高中英语语法总结--强调句、It的用法、省略和插入语
高中英语语法总结——强调句、It的用法、省略和插入语一、强调句（一）强调句句型1、陈述句的强调句型：It is/ was + 被强调部分（通常是主语、宾语或状语）+ that/ who（当强调主语且主语指人）+ 其它部分。
e.g. It was yesterday that he met Li Ping.2、一般疑问句的强调句型：同上，只是把is/ was提到it前面。
e.g. Was it yesterday that he met Li Ping?3、特殊疑问句的强调句型：被强调部分（通常是疑问代词或疑问副词）+ is/ was + it + that/ who + 其它部分？e.g. When and where was it that you were born?4、强调句例句：针对I met Li Ming at the railway station yesterday.句子进行强调。
强调主语：It was I that (who) met Li Ming at the railway station yesterday.强调宾语：It was Li Ming that I met at the railway station yesterday.强调地点状语：It was at the railway station that I met Li Ming yesterday.强调时间状语：It was yesterday that I met Li Ming at the railway station.5、注意：构成强调句的it本身没有词义；强调句中的连接词一般只用that, who，即使在强调时间状语和地点状语时也如此，that, who不可省略；强调句中的时态只用两种，一般现在时和一般过去时。
原句谓语动词是一般过去时、过去完成时和过去进行时，用It was …，其余的时态用It is …。
(完整版)英语强调句及it用法大全
英语强调句及it用法大全强调句、It的用法、省略和插入语一、强调句（一）强调句句型1、陈述句的强调句型：It is/ was + 被强调部分（通常是主语、宾语或状语）+ that/ who （当强调主语且主语指人）+ 其它部分。
e.g. It was yesterday that he met Li Ping.2、一般疑问句的强调句型：同上，只是把is/ was提到it前面。
e.g. Was it yesterday that he met Li Ping?3、特殊疑问句的强调句型：被强调部分（通常是疑问代词或疑问副词）+ is/ was + it + that/ who + 其它部分？e.g. When and where was it that you were born?4、强调句例句：针对I met Li Ming at the railway station yesterday.句子进行强调。
强调主语：It was I that (who) met Li Ming at the railway station yesterday.强调宾语：It was Li Ming that I met at the railway station yesterday.强调地点状语：It was at the railway station that I met Li Ming yesterday.强调时间状语：It was yesterday that I met Li Ming at the railway station.5、注意：构成强调句的it本身没有词义；强调句中的连接词一般只用that, who，即使在强调时间状语和地点状语时也如此，that, who不可省略；强调句中的时态只用两种，一般现在时和一般过去时。
原句谓语动词是一般过去时、过去完成时和过去进行时，用It was … ，其余的时态用It is … 。
it的用法及句型总结
It的用法一、Tell the functions for “it" in each sentence:1、—--What's the weather together？—-—It is fine。
2. It is hard to communicate with him。
3。
I find it hard to communicate with him。
4。
It is Li that who cleaned the classroom。
5。
It is a book。
二、It 用法归纳1,指代it（1）.用作人称代词：指代物、整个句子(2）用作非人称代词2，形式it:（1)作形式主语（2)作形式宾语3，强调it4，特殊句型5。
在答语中指代this/that：1）.—-—Whose book is that? ——-It’s mine.三、特别注意：it, one和that作替代词的用法及区别1。
it代替前面提到的同一事物,该事物既可以是可数名词也可以是不可数名词。
(特指，指代单数，指代物,同名同物）Can I borrow your pen?-Sorry，I'm using it。
2。
one代替前面提到的同类事物中的一个。
该事物只能是可数名词，前面可以有冠词，也可以被this、that或形容词修饰,其后也可以有定语. (泛指，指代可数名词，指代人或物,同名异物）I have a bike。
Do you have one?Eg：（1）.I bought a dictionary three years ago and I am still using______ now。
(2) I bought a dictionary three years ago but I am going to buy a new _______soon. （3)。
that代替前面提到的同类事物中特指的一个。
it 用法总结
It的用法总结在英语中,it有许多不同的用法,它既可以用作代词(如人称代词、非人称代词)，也可以用作引导词（作形式主语或形式宾语），还可以用来构成强调句型。
1.it用作代词(1) 用作人称代词在句子中作主语或宾语；指前面已经提到过的事物、动物或人，且it指特定的事物；如果指前文中提到的事物中的任何一个，用one。
one可以与any, each, every, not等连用，但one不可代替不可数名词。
—Where’s your car?—It’s in the garage. 你的汽车在哪儿呢？在车库里。
(指代物品your car)Did you hit it? 你打中了吗？(指代事件)The baby cried when it was hungry.这婴儿饿时就哭。
（指代婴儿，尤指性别不详或无所谓时）—Who is that?—It’s me. 是谁？我。
(指一定情景中所确定的人或事物，此时相当于指示代词，代指this 和that,有时也指人)—What’s this?—It’s a box. 这是什么？一只箱子。
(2) 作非人称代词表示天气、日期、时间、温度、距离、价值、路程、度量、自然现象与环境等。
也可模糊地指一般情形或上文的部分或整个意思。
译成汉语时，it通常不一定译出来。
It’s a long time since they left. 他们走后很久了。
It’s two miles to the beach.离海滨有两英里远。
That’s just it—I can’t work when you’re making so much noise.原因就在这里——你弄出这么大的声音，我工作不了。
另外，需要注意两点：（1）“It’s time…”后面可以接不定式和介词短语表示“是做……的时候了”。
如：It’s time for supper. It’s time to have supper.(2) “It’s time…”后面还可以接一个从句，但是从句中的谓语动词一定要用过去式即虚拟语气，如：It’s time we had lunch.是我们吃饭的时候了。
It在强调句中的用法考点透视
It在强调句中的用法考点透视高中高三英语教研组It一词是高中英语中考查比较频繁的一个词，it含义简单却用法众多，透过近几年的高考试题我们可以看出，各省份高考试题对it的考查十分频繁，尤其是关于it在强调句中的用法的考查更是成为了考查的热点。
以下本文结合近几年高考试题对it在强调句中用法的考查，来对it在强调句中的用法进行一个详细的解析和回顾，通过对照高考真题，归纳讲解it在强调句中的用法，以方便同学们进一步系统牢固地掌握有关it在强调句中的种种用法：1．强调句型的基本结构是：“It is (was) +被强调部分+ that (who) + 其它”被强调部分如果是指人则引导词可以用who，其余情况都用that。
强调句也可以有变体形式，例如：It may have been at the Christmas that John gave Mary a handbag.It might have been John who gave Mary a handbag.强调句的判定方法是：将强调句中的it is/was以及连接词that或who去掉，如果句子仍然成立，成分仍然完整，则说明该句是强调句。
强调句理论上可以强调除谓语以外的任何成分，但是在正式英语中，强调句也一般不强调表语（或叫做主语补足语），例如：It is I who am to blame. （强调主语）It was a new pen that Mother gave me.（强调宾语）It was in the classroom that I left my umbrella.（强调地点状语）It is at eleven that the train leaves.（强调时间状语）It was just as he ordered that I acted.（强调方式状语）It was because he was in trouble that I tried my best to help him.（强调原因状语）It was chairman that they elected him.（强调宾语补足语）相关高考试题：（1）It was after he got what he had desired _______ he realized it was not so important.（06年高考辽宁卷第35题）A. thatB. whenC. sinceD. as（2）David said that it was because of his strong interest in literature _______ he chose the course.（06年高考上海春季招生卷第35题）A. thatB. whatC. whyD. how（3）It is what you do rather than what you say _______ matters.（05年高考天津卷第9题）A. thatB. whatC. whichD. this（4）It was only with the help of the local guide ________.（05年高考上海春季招生卷第37题）A. was the mountain climber rescuedB. that the mountain climber was rescuedC. when the mountain climber was rescuedD. then the mountain climber was rescued 答案：（1）A（2）A（3）A（4）B2．强调句的疑问句形式：强调句的一般疑问句：Is/Was it + 被强调部分 + that /who强调句型的特殊疑问句：疑问词 + is/was it + that/who（1）I just wonder ____ that makes him so excited.（06年高考山东卷第32题）A. why it doesB. what he doesC. how it isD. what it is（2）—____ that he managed to get the information?—Oh, a friend of his helped him.（05年高考山东卷第31题）A. Where was itB. What was itC. How was itD. Why was it答案：（1）D（2）C3．It is/was not until…that…表示“直到……时候才”，也是一个强调句型。
It的用法
It的用法It的用法分为四类：人称代词it，形式主语/形式宾语it，强调句型it，固定结构it一、人称代词it：1. 指代前面提到的具体事物、动物，也可指婴儿或未知的人。
1) I was disappointed with the film , I had expected _______ to be much better.A. thatB. thisC. oneD. it2）They got a baby and _____was very lovely.2. 指代天气，时间，距离等抽象事物。
It’s cold today. What time is it?It’s far away from here. It’s quiet here.1) It’s high time that …常用虚拟语气,常用过去式表虚拟有时也用should(不省)+V原It’s high time that children ________________________.（上床睡觉）2) It’s the first/second/last…time(that)…从句用现在完成时态。
如果主句be为was，从句则用过去完成时态It’s the first time I （visit）here.This was the first time that I (visit) here.3）It is (has been)+时间段+since…从句通常是一般过去时如果主句be为was，则从句用过去完成时It is /has been 5 years since his father died.It is /has been 5 years since he lived here. 其意义为：_____________。
4) It + be + 时间段 + before…常译为___________________________。
“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.。
It的用法和强调
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.
it和one的用法
it和one的用法一、it的用法1. 主语和占位符在英语中，it常用作主语或占位符，来代替前面提到的事物或概念。
例如：- It is raining outside.外面正在下雨。
- It is important to get enough sleep.获得足够的睡眠是很重要的。
2. 强调句型it也可以用于强调句型中，这种结构强调了it所指代的部分。
例如：- It was Mary who won the competition.是玛丽赢得了比赛。
3. 时间和天气表达在英语中，it常用来表示时间和天气条件。
例如：- What time is it?现在几点钟？- It is sunny today.今天阳光明媚。
4. 距离和方向表达使用it还可以描述距离和方向。
例如：- How far is it from here to the train station?从这里到火车站有多远？- Can you show me how to get there?你能告诉我怎么去那里吗？5. 客观判断和个人意见在进行客观判断或提出个人意见时，常用it。
例如：- I find it hard to believe what he said.我发现很难相信他说的话。
- It seems that we have a problem.看起来我们有一个问题。
二、one的用法1. 代词one常被用作人称代词，代表一个或任何不特定的人。
例如：- One should always be polite to others.一个人应该对他人始终保持礼貌。
2. 替代名词one可以用来替代前面提到的事物或概念，使得句子更流畅一致。
例如：- I borrowed a pen from John. Can you lend me one?我从约翰那里借了一支笔。
你能借给我一支吗？3. 计数在某些情况下，one可以表示“一个”。
例如：- I have only one ticket left.我只剩下一张票了。
高考英语中的it强调句型复习
高考英语中的it强调句型复习一、it强调句型的构成：用it的句型：It be+强调部分+that/who+其他部分1、结构分析强调人强调人或物It is /was +强调部分+that /who +其他成分强调除谓语以外的句子成分只能是单数强调：It is they that/who will have a meeting in the hall tomorrow.强调：It is a meeting that they will have in the hall tomorrow.强调：It is in the hall that they will have a meeting tomorrow.强调：It is tomorrow that they will have a meeting in the hall.此结构强调的成分仅限于主语、宾语、表语和状语。
eg：My father did the experiment in the lab yesterday evening.强调主语： It was my father who did the experiment in the lab yesterday evening.强调宾语：It was the experiment that my father did in the lab yesterday evening.强调时间：It was yesterday evening that my father did the experiment in the lab.强调地点：It was in the lab that my father did the experiment yesterday evening.2、使用it的强调句应注意的问题：1）主谓一致It is your father who is wrong this timeIt is his parents who have come to China.主语谓语：保持一致总结归纳：主谓一致：被强调部分作主语时，其形式与谓语动词在人称和数上保持一致。
高考英语It句型和强调倒装句式讲解
高考英语It句型和强调倒装句式讲解一、复习思路这三种句式主要在翻译题中考查；每一种句式都是先讲解知识点然后辅以练习，练习难度分为三个层次。
二、复习要点1. 知识点1：It句型"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。
That Sunkong develops fast is well-known to us.______________________________________________________.It作形式主语的概念：当不定式（短语），动名词（短语）或从句在句子中作主语时，为保持平衡，避免句式结构的混乱，常用it 作形式主语，而将真正的主语放在句尾。
It 作形式主语的常用句型:①It + be + 形容词(obvious, true, natural, surprising, good, wonderful, funny, possible, likely, certain, probable, quite clear, unusual, etc.) + that从句。
如：It is certain that she will do well in her exam.It is probable that he told her everything.②It + be + 名词词组(a fact, good news, no wonder, an honor, a good thing, a pity, no surprise, etc.) + that从句。
如：It's a pity that we can't go.It's no surprise that our team should have won the game.③It + be + 过去分词(said, reported, thought, expected, decided, announced, arranged, etc.) + that从句。
“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.（3）It替代作主语的动名词的常见句型It’s no good/use doing…It's（well）worth doing…It's（well）worth one’s while doing/to do…It’s（well)worth while doing/ to do例It's no use crying over spilt milk.2。
it的用法、常用句型
三、it用于强调句型中 强调句型可以对句中除谓语动词以外的成 分加以强调。
四、it用在一些固定表达中 As someone puts it, ... 像某人所说的那样 Please see to it that ... 请务必…… When it comes to ... 当提到……时 It looks / seems as if ... 看起来好像…… It’s time for sth. 该做某事了 It’s time (for sb.) to do sth. (某人)该干某事了 It is (high) time that ... (早就)该……
4) “It +动词的被动语态+主语从句”。常用 于本句型的动词主要有accept, admit, allow, announce等。 e.g. It’s accepted that the universe is endless. It is generally admitted that he is a trustworthy person. It was announced that all prisoners would be set free.
2. 用作非人称代词，指时间、天气、距离或 自然现象等。 e.g. It is only half an hour’s walk to the hospital. It’s about two kilometers from here to the station. It is raining heavily outside.
b. 动词+介词+ it + that从句 能用于此句型的主要有：depend on, answer for, see to。 e.g. You may depend on it that he will turn up in time. I can’t answer for it that the boy is honest. I’ll see to it that all these letters will be sent to the post before twelve.
it的用法_强调句型
[小 结] 考查名词性从句中强调句型 我们应注意的是： 1.陈述句句序； 2.特殊疑问词位置。
Good-bye!
Review (self-study )
1. it作人称代词,代替前面提到的事物. 2. it指代时间,季节,距离.
3. it作形式宾语,常用在动词为think , find,
make, believe…结构中.
4. it作形式主语. 当动名词,不定式,从句作主语
时,常用it作形式主语.
5.常见的句型结构，如：can’t/couldn’t help it
It is not until everyone is seated that the meeting will begin.
考查not until用于强调句型
1．It wasn't until nearly a month later______ I received the manager's reply． A．since B．when C．as D．that 2．Was it not until you began to work ______ how much time you had wasted? A. did you realize B. that you realized C. did you not realize D. that you didn't realize 3. Wasn't it until Michael ran into me ______ he recognized I was once his partner? A．then B．when C．which D．that
7．-- When was it _____ the Nanhai No．1，the sunken ship was raised from the seabed? -- 0n December 22，2007． A．that B．what C．／ D．which 8．-- Where was it _____ the earthquake broke out yesterday? -- In an Italian city． A．where B．which C．how D．that 9. -- _____ was it _____ they discovered the entrance to the underground palace? -- Totally by chance． A．What；that B．How；that C．When；how D．Where；how
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。
高考英语：it的用法
2）真实主语是主语从句。常见句型如下： a. It + be +名词+主语从句。如：
It is a great pity (that) he can't swim. It was no accident (that) such a book (should) appear in the 18th century. It was a puzzle whether he should get married. It was a mystery how the thieves got in.
from a store kman that Alice bought from a store last week. （强调宾语a walkman）
③It was from a store that Alice bought a Walkman last week. （强调地点状语from a store）
4. 强调句型用于特殊疑问句，被强调的通常 是疑问词。
注意：此强调句型不能强调谓语动词。若需 强调谓语动词，常用“助动词do / does / did + 动词原形”。
四、一些含it的固定句型 As someone puts it, ... 像某人所说的那样，…… Please see to it that ... 请务必…… When it comes to ... 当提到……时 It looks / seems as if ... 看起来好像…… It's time for sth. 该做某事了
it的用法、常用句型
I’d prefer it if I didn’t have to do so much
work.
I would appreciate it very much if you would
help me with it.
b. 动词+介词+ it + that从句 能用于此句型的主要有：depend on, answer for, see to。如： You may depend on it that he will turn up in time.
reputation of an honest man.
It was no accident that such a book should
appear in the 18th century. 2) “It + be +形容词+主语从句”中从句谓语常用 “（should +）动词原形（或完成时）”。常用 于本句型的形容词主要有impossible, strange,
2. —Steven’s parents have bought him a computer.
—__I_t _ __is__ __n_o_ _w__o_n_d_e_r_ (难怪) that he looks so happy.
3. Susana’s aim is to tell all citizens they have a duty to protect the environment, _is_n_’_t_ __it_ (对吗)?
2. Raise your leg and let 65 stay in the air for seconds. （辽宁2014第三部分）
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it的用法和强调句(20)
1．It was only when the accident took place _________ （他才意识到）the importance of careful driving．（realize）
that he realized
2．I heard that it was ten years later, in 2010, _______________(他们的婚姻破裂).(break)
that their marriage broke up
3. It __________________________(直到战争结束) that he returned home. (end)
was not until the war ended
4.Actually, it was not until I was appointed to be in charge of the research team_____________ the importance of teamwork. (aware)
实际上，直到我被指定负责这个研究小组的时候我才意识到团队合作的重要性。
that I was aware of考查强调句和短语。
题干使用了句型''it was not until.. .that...", 因此本空是强调句的后面部分，应用that, 用be aware of表示"意识到，知道"。
5. Communication becomes more convenient nowadays. Cellphones ______________ (使得这成为可能)for us to talk to anyone from anywhere. (make) make it possible
6．在上学的路上，我突然想起我把英语书忘在家里，所以我不得不回去取。
On my way to school, ___________________________ that I had left my English book at home, so I had to fetch it .(occur)
it (suddenly) occurred to me
7 .__________________（坚持在一起）your friends through thick and thin that brings you lifelong friends.（stick）
It is sticking with
8．Could you tell me _____________（在哪里）you found the missing boy．（it）where it was that
9. It is your efforts, rather than your intelligence,__________（决定）your success.（determine）
that determine
10. I still wonder what it was (令他失望)badly. Shall we go and comfort him?( let ) that let him down
11．Though he was a newcomer, I found it easy_____________ （和他相处）.（get）to get along / on with him
12．I think it important ___________________ (与我们的朋友保持联系). (touch) to keep / stay in touch with our friends
13.Each new way of looking at a situation improves our understanding
and____________（使…更容易）to discover new possibilities.（make ）
makes it easier
14. It is the protection for trees _______________________（真正起作用）, rather
than how many trees are planted.（matter）
that really matters
15. It was nine years ago, when I came to China for the first time, ______ (我开始)learn Chinese. (begin)
that I began to
16. It is not who is right but what is right ______________. (importance)
重要的不是谁是对的，而是什么是对的.
that is of importance。
17.No one knows exactly ____________this custom first came into being. (it)
没人确切知道这一风俗到底是何时开始形成的。
when it was that考查强调句型。
根据句子结构及汉语提示可知，此处强调when, 且用陈述语序；由语境可知用一般过去时。
18. They ________ yesterday, but failed to meet you. ( see)
他们昨天的确去看你了，但没见到你。
did go to see you。
19. .It is you, including your cousin, ____________for the loss of the golden chance. (blame) 你和你的表哥应对失去这个好机会负责：
that/who are to blame。
20. It_________ to have helped me when he was so busy himself. ( considerate)
他这么忙，还给我这么多帮助，可真是考虑得太周到了。
was considerate of him。