人教版高中英语[知识点整理及重点题型梳理]it的用法及强调句型
(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 … 句型的强调句（二）not … until … 1、句型为：It is/ was not until + 被强调部分+ that + 其它部分e.g. 普通句：He di dn’t go to bed until/ till his wife came back.强调句：It was not until his wife came back that he went to bed.2、注意：此句型只用until，不用till。
(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用法归纳(高中英语)
“it” 两项重点用法Mar 4. 2011 这两项重点用法指的是强调句和it做形式成分。
一.强调句:一）陈述句：It + is / was + 被强调部分+ that / who … ( 强调人时可用who )I met Tom in the street yesterday.针对各个划线部分变强调句：1) It was I that met Tom in the street yesterday.2) It was Tom that I met in the street yesterday.3) It was in the street that I met Tom yesterday.4) It was yesterday that I met Tom in the street.二）一般疑问句：1) Was it I that met Tom in the street yesterday?2) Was it Tom that I met in the street yesterday?3) Was it in the street that I met Tom yesterday?4) Was it yesterday that I met Tom in the street?三）特殊疑问句：1) Who was it that met Tom in the street yesterday?2) Who was it that I met in the street yesterday?3) Where was it that I met Tom yesterday?4) When was it that I met Tom in the street?四）特殊疑问句作宾语从句：I forgot…1) I forgot who it was that met Tom in the street yesterday.2) I forgot who it was that I met in the street yesterday.3) I forgot where it was that I met Tom yesterday.4) I forgot when it was that I met Tom in the street.结论：特殊疑问句作宾语从句时，主谓词序正常。
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。
高中英语it的用法的归纳总结
高中英语it的用法的归纳总结以下是关于 it 的用法的一些归纳总结:1. 当 it 作为形式主语时，常用动词不定式或名词形式充当主语，其后面通常会加上 for 或 to 引导的短语。
例如：- It"s important to study hard.(努力学习很重要。
)- It"s a beautiful day.(今天天气很好。
)- It"s difficult to imagine a better place to live.(无法想象一个更适合居住的地方。
)2. 当 it 作为形式宾语时，通常用不定式或名词形式充当宾语，并在其后加上 for 或 to 引导的短语。
例如：- I appreciate your help.(感谢你的帮助。
)- It"s a great opportunity for me to learn new skills.(这是一个我学习新技能的好机会。
)- It"s necessary to clean the room.(打扫房间有必要。
)3. 当 it 作为实义主语时，表示某一具体事物或人物。
例如： - It"s a beautiful day, isn"t it?(今天天气很好，是吗？) - It"s yours, isn"t it?(这是你的吗？)4. 当 it 作为强调句的结构时，通常位于句首，其后是句子的主要成分。
例如：- I don"t know who it was that called me yesterday.(我不知道昨天是谁给我打电话。
)- It was yesterday that I visited my grandmother.(昨天我去看望了我奶奶。
)5. 当 it 作为单数名词时，通常指某一类人或物中的一个。
例如：- It"s a police car.(这是一辆警车。
人教版高中英语【选修六】[知识点整理及重点题型梳理] it的用法(1)
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人教版高中英语选修六知识点梳理重点题型（常考知识点）巩固练习it的用法（1）概念引入小词it是我们学英语之初就学会的，是不是感觉它似乎有点无所不能，经常出现呀？那么我们是不是已经了解了it的用法了呢？本单元和下单元我们就把it的用法做一小结。
先看这些句子，想想it的用法是什么？1. It is a beautiful day here and I am sitting under the big tree at the end of the garden.(表天气)2. It seems amazing that at my age I am still fit enough to cycle 20 kilometres in anafternoon.(代替that从句作主语)3. It’s my birthday in two weeks’ time and I’ll be 82 years old!(表时间)4. Your mother tells me that you started smoking some time ago and now you are finding itdifficult to give it up.(第一个it代替to give it up作宾语；第二个it代替上文中“吸烟”的事) 下面我们就先学习it作为代词和形式主语、形式宾语的用法。
用法讲解代词it1. 作人称代词人称代词it是有实义的，是单数第三人称代词。
主格与宾格相同。
1）指代人以外的一切生物或事物，如前文提到的事物或未指明但谈话双方都知道的那件事；Ningbo is a beautiful city, isn’t it? 宁波是座美丽的城市，是不是？It doesn’t matter. 没关系。
2）替代前文中的this, that；This is your plan? Will you hand it in? 这是你的计划？你要交上去吗？3）指代婴儿、小孩或性别不明的人。
(完整版)人教版新课标高中英语各单元重点知识内容梳理
人教版新课标高中英语各单元重点知识内容梳理年级教材单元重要句型重点语法命题趋势高一部分必修1Unit 1 it强调句结构直接引语变间接引语单项选择题中侧重对语序与引导词的考查Unit 2even if引导的让步状语从句Unit 3主语+ be +形容词+动词不定式现在进行时态表将来单项选择题中考查该时态在具体语境中的灵活运用Unit 4as if状语从句It is no wonderthat从句关系代词that, which,who, whom, whose, as引导的定语从句定语从句是高中英语的重点内容，单选、完型以及短文改错均会涉及，而阅读材料中也会大量出现Unit 5There was atime when从句关系副词when, where,why引导的定语从句必修2Unit 1There is nodoubt that从句非限制性定语从句非限制性定语从句的关系词，as与which引导时的区别Unit 2the+adj.比较级，the+adj.比较级一般将来时的被动语态单项选择题中考查各种时态在具体语境中的灵活运用；时态也是短文改错的习惯考点Unit 3as引导的状语从句现在完成时的被动语态Unit 4long before与before long 现在进行时的被动语态Unit 5 with复合结构定语从句中介词前置现象单选、改错涉及必修3Unit 1the + adj.表类指情态动词may/might,can/could, will/would,shall/should, must, can’t单项选择题中考查主要情态动词基本用法；某些情态动词会在完型考查Unit 2动词seem的相关句型ought(not)to, have to,don’t have to的用法。
人教版高三英语一轮复习--- it的用法
“it”的用法一、教学目标：通过本课的学习，帮助同学们进一步了解“it”的用法。
二、教学重难点：重点了解it的指代用法和it用于强调句型中的用法三、教学过程：（一）、it的指代用法1.指代上文提到的某样东西Where is my dictionary?I left it right on the desk.我的字典在哪里？我就把它放在书桌上了。
2.用以代替指示代词 this,that－What's this?-这是什么？－It's a flag.-是一面旗。
3.指不知性别的婴儿（baby) 或身份不明确的人（由于某种原因而不知道对方是谁）The baby cried because it was hungry.这个婴儿因饥饿而啼哭。
－Who is knocking at the door?－It must be the milkman.一谁在敲门？一定是送奶工。
4.指时间、距离、价值、天气、气候或温度It is nine o'clock sharp now.现在是9点整。
It is raining hard outside.外面雨下得正大。
It is a long way to the factory.到工厂有很长一段路。
5.it常用来代替不定式、动名词短语或名词性从句作形式主语或形式宾语而将真正的主语或宾语后置It's not easy to learn a foreign language.学习一门外语不容易。
（代替不定式短语作形式主语）I have made it clear that nobody is allowed to smoke here. 我已经讲得很清楚了，任何人都不准在这儿吸烟。
（代替名词性从句作形式宾语）（二）、it用于强调句型1.在陈述句中，It is/was/情态动词be+被强调部分+ that/who+其他成分。
被强调部分为“人”时可用who/that,被强调部分是“非人”时用that.It is I who/that am right.( 强调主语）我是对的。
人教版本高中英语选修六Book6Unit3Grammar“it”的用法一
高中英语学习资料madeofjingetiejiGRAMMAR“it”的用法（一）【概括】it的用法好多，本单元我们主要学习它的基本用法以及它作形式主语或形式宾语的用法。
1.用作人称代词，指代上文提到的事物、动物、性别不明或没必需知道性其他人。
如：“Where’syourcar?”“It’sinthegarage.”Herdogwashowlingatthedoor,soheletitin.Thebabynextdoorkeptmeawake.Itcriedallnight.用作非人称代词，用来指代时间、日期、地址、天气、温度、距离、环境、状况等。
如：Itwas4o ’clockandthemailstillhadn’tcome.It’squitewarmatthemoment.It’sover200milesfromLondontoManchester.It’sgettingverycompetitiveinthecarindustry.3.用作形式主语，真实的主语常为不定式（短语）、动词-ing形式（短语）或名词性从句。
如：It’s impossibleforustogetthereintime.It’salwayssadsayinggoodbyetosomeoneyoulove.It’sstrangethatshenevermentionedthewedding.4.用作形式宾语，真实的宾语常为不定式（短语）、动词-ing形式（短语）或名词性从句。
如：Manypeoplefindithardtostopsmoking.Shefindsitboringstaying/tostayathome.Ifinditstrangethatshedoesn ’twanttotravel.【辨析】it,one和that1.it指物时，是明确指上文提到的那个事物。
it能够取代单数可数名词、不行数名词及前方提到的事情或状况。
高中英语It用法详解[共33页]
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It的用法解析1.it在强调句中用法：⑪It is + 被强调部分+ that …该句型是强调句型，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时，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依据；①It was they that <who> cleaned the classroom yesterday.昨天是他们打扫的教室。
（强调主语）②It is her sister that I have fallen in love with.我爱上的是她的姐姐。
（强调宾语）③It was under the tree that he found his missing purse.他是在树底下找到自己丢失的钱包。
（强调地点状语）④It was last week that I visited the Shanghai Expo.我是上周参观的上海世博。
（强调时间状语）⑫It is not until + 被强调部分+ that …该句型是＂not… until…句型”的强调句，意为＂直到．．．才．．．＂，that后的从句要用肯定句，不可再用否定句；【注意：not until置于句首时，主句用倒装结构；】①It was not until she took off her dark glasses that I recognized she was a famous film star. （强调句）直到她摘下墨镜，我才认出她是一名著名的电影明星。
②Not until she took off her dark glasses did I recognize she was a famous film star. （倒装句）直到她摘下墨镜，我才认出她是一名著名的电影明星。
⑬强调句型的特殊疑问句结构：特殊疑问词+is/was + it + that …；①Who was it that you want to see? 你究竟想见谁？②Why is it that you want to change your mind? 你究竟为什么要改变主意？⑭强调句型的一般疑问句结构：Was/Is it +被强调部分+that…；①Was it they that cleaned the classroom yesterday? 昨天是他们打扫的教室吗？②Was it last week that you visited the Shanghai Expo?你是上周参观的上海世博吗？【注意事项】⑪强调句型结构基本要点：①强调句型中，通常强调主语、宾语、状语等；一般而言，该结构<It is/ was … that …>不可以强调谓语，若强调谓语，则用助动词do/does/did，其后的谓语用动词原形；(a) She did go there alone.她确实是一个人独自去那儿的。
(完整版)高中语法：it用法
It 的用法It 可用作实词（代词）和虚词（助词）。
实词it 指用于人称和前指（指刚提到的人或物），用于无人称时，做主语，表示时间，距离，天气等。
虚词it 可用作形式主语或形式宾语，也用于构成的强调句型。
（一）实词（代词）1. 用作人称代词1）指人。
例如：Who is it? Is it you, Andrew ?Who is making such a noise ? It must be the children.2）用作前指，代替前文提到过的人或事物。
例如：What a beautiful baby ! Is it a boy ?You have saved my life; I shall never forget it.3 ）代替指示代词this, that。
例如：“What's this ?” “It'sa flag.”4 ）代替一个双方既知所指的东西How 'sit going with you ?2. 用作非人称代词常用作没有具体意义的主语，表示气候，天气，温度，时间，地点，距离等。
例如：1）指天气：It 'sdamp and cold. I think it 's going to rain.2）指时间，季节等：“ what time is it ? ” “It is eight o 'clock. ”I hope it is spring all the year round.3）指距离It is five kilometers from the office to my home.4）指环境，条件等It was very quiet and peaceful here,It was becoming increasing dangerous.5）“无人称it ”也用于表达下列2 个结构表达印象和可能性：It seems as if we've known each other for years, （印象）It looks as though I 'm going to fail the test6）“无人称it ”还用于下列的表达中as it is事实上So be it但愿如此，好吧That' s it !对，是这样！make it到达，成功（二）虚词（助词）1. 作形式主语当动词不定式，动名词，或从句做主语时，通常把她们放在谓语后，而用it 做形式主语。
代词IT的用法（人教版高三英语下册教学论文）
代词IT的用法（人教版高三英语下册教学论文）代词IT的用法一．IT的用法用法例证1. 用作代词，为人称代词；第三人称单数，主格与宾格 There is a map on the wall. It is a map of China. 墙上有张地图，它是一张中国地图。
(It指代上文提到的a map，在句中作主语)Our monitor suggested that we go outing on Sunday. No one was against it. 班长建议我们星期天去郊游，没人反对。
(it指代上句这件事，作介词的宾语)2．作无人称代词，除了句中找不到它所代表的词语外，另一个特点是它后面的内容都是表天气，时间，度量及情况等。
"What time is it?" "It's twelve o'clock." “现在几点了?”“十二点钟。
”(指代时间) It was quiet at that moment. 当时非常安静。
(指代情况)3．作先行代词。
It作先行代词时，本身没有具体意义，而只是帮助把真正的主语或宾语移到句子的后面去，it的作用是代替它后面起主语或宾语作用的不定式，动名词或从句。
It is very important for us to study English. 学英语对我们来说非常重要。
(it指代后面的动词不定式。
)It's doubtful whether he will be able to come. 他能否来还很难说。
(it代替后面的whether从句)It's no use crying over the spilt milk. 牛奶倾覆，哭之无益。
(覆水难收)(it指代后面的动名词。
)I owe it to you that I can achieve so much. 我能取得这些成绩都归功于你。
高二英语期末复习 Unit20语法复习 It相关的句型 人教版
高二英语期末复习 Unit20语法复习 It相关的句型人教版一. 本周教育内容：期末复习：Unit 20语法复习：It相关的句型（一）it用做形式主语或形式宾语：主要句型：It’s +形容词/名词+连词+名词性从句to do sth.doing sth.find / make / think / feel it +形容词/名词+连词+名词性从句to do sth.doing sth.例句：1. It’s usual for close friends to have simila r ideas and beliefs .2. It’s a pity that I didn’t think of it earlier.3. It’s no use going there so early.4. Out teacher thinks it no good learning without practice.（二）其他句型1. It takes+时间段+sb.+ to do sth.2. 表示“据说，据报道，/人们认为/相信/建议等”It’s said that …It’s reported that …It’s believed/thought/suggested that …例句：1. It generally takes time to reach this point-being on the same wavelength .2. It’s suggested that we should have a meeting to discuss the problem .（三）it在强调句型中：在英语中，为了突出强调句子的某一个成分（谓语除外），达到强调或使听话人特别注意这一部分的目的。
便形成了一种强调句型。
It is / was+被强调的部分+that / who+句子的其他部分。
It is / was not until+时间+that+句子的其他部分。
高中英语语法知识之It的用法总结
高考英语语法知识之It 的用法总结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，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 was 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 she was a famous film star.= Not until she took off her dark glasses did I realize she was a famous film star.= I didn’t realize she was a famous film star until she took off her dark glasses.3．It is clear ( obvious, true, possible,certain....) that .....该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）＂是主语从句最常见的一种结构。
It is very clear that he’s round and tall like a tree.= That he’s round and tall like a tree is very clear.4. It is important ( necessary, right, strange, natural...) that ...由于主句中的形容词不同，that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去。
人教版高中英语【选修六】[语法讲解 it的用法(2)
人教版高中英语选修六知识点梳理重点题型（常考知识点）巩固练习it的用法（2）概念引入上个单元中，我们已经学习it作代词和形式主语、形式宾语的用法，现在将继续学习it引出强调句的用法及一些与it有关的重点句型。
先看这些句子：1. There is no doubt that the earth is becoming warmer and that it is human activity that has caused this global warming rather than a random but natural phenomenon.2. It was a scientist called Charles Keeling, who made accurate measurement of the amountof carbon dioxide in the atmosphere from 1956 to 1997.3. They also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide.4. It was during the 20th century that the temperature of the earth went up about one degree Fahrenheit.这些句子都是强调句，中的斜体词部分标识出了句中的强调句结构。
用法讲解it引出的强调句1【it的用法----强调句】强调句的结构：It is / was + 被强调部分（主语，宾语，状语）+ that (who / whom) + 其它部分在强调句型中：1. 被强调部分可以是主语、宾语或状语。
2. 引导词一般用that，如果是人的话，强调主语还可以用who，强调宾语用who和whom皆可。
高中英语it的基本用法
高中英语it的基本用法''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。
初小内容归纳：一、it指代（后行）作用:1.It的基本用法是用来指代上文所提到的事物。
如橙子妈妈经常给学生用最简单的方法举例：I have a pen and I like it.2.学会区分这几组词：it, that, one, the one, ones, the ones用于指代:橙子妈妈归纳的口诀：it指代同名同物；one指代同名异物, that 指代抽象物体居多即it代替上文提及的原物(复数用they)；one指代上文提及的、泛指的可数名词单数（复数ones）；that指代上文提及的定指的可数名词单数或不可数名词（复数those）, the ones 相当于these, those。
注意：指代不明身份（例如有人在外面叫你或者敲门）或性别的人（如小baby）也用it；指代喜爱的事物或宠物也可用she / he。
A：Who''s it (knocking at the door)? B: It''s me.二、虚义it:（初中阶段的重点内容）虚义it指用作没有具体语义的主语，如表示时间、天气、距离、温度等概念的用法。
It is a good day.It cost me 10 dollars.高中内容归纳一、形式it:由于句子结构的需要，常常把it作形式主语，而把真正的主语放后置。
小伙伴们熟不熟悉！1．形式主语：不定式、动名词以及主语从句作主语时，为避免“头重脚轻”，要将真正的主语后置。
It is obvious that he will win the match. （主语从句作主语）It was worthwhile searching for his ''roots.'' （动名词作主语）It took me 10 dollars to buy the book. （不定式作主语）2．形式宾语：当不定式、动名词、that 从句作宾语，又有自己的宾语补语时，要用it 作形式宾语，而把真正的宾语后置。
高中英语语法It的用法总结
高中英语语法It的用法总结一、It 用作实词表达以下概念:指代前文提到的事物，如前文中的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（覆水难收）.2. It替代作主语的从句常见句型：(1) It is + noun +从句例: It is no secret that the president wants to have a second term at office.(2) It is adj. +clauseIt's surprising that… (should)………竟然……It's a pity/shame that…(should)………竟然……例: It's important that you should apologize to her for your rudeness.(=It's of much importance that you should apologize to her for your rudeness.)(3) It verb sb. + clause= It is v-ing + clauseIt+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/concern/frighten/please/anger sb. that…例: It worried me that she drove so fast.(= It was worrying that she drove so fast.)(4) It verb (to sb.) that…= sb/sth verb to do例: It (so) happened/chanced that they were out.(= They happened/chanced to be out.)(5) It is v-ed that…=sb/sth is to do(verb=say, report, think, believe, hope, expect, agree, accept, decide, determine, intend, plan, understand, know）例: It is said that the couple have gotten divorced.(=The couple are said to have gotten divorced.)(6) It is v-ed that … (should)…(verb=demand, request, require, order, suggest, advise, recommend例It is suggested that they should begin with the third question.三、It 作主语的句型1. It takes sb. … to do…(=sb takes…to do…)某人用多长时间做某事例: It took the men a week to mend our roof.(= The men took a week to mend our roof.)2. It's (just)(un)like sb. to do…（不）像某人做某事的风格例: It was (just) like him to think of helping us.3. It's (about/high) time that… should /v-ed…是该做某事的时候了例: It's(about/high) time that we should take action.4. It's the x-th time (that) … have v-ed…第几次做某事了例: It's the third time that he has failed the driving test.5. It is/has been… since …continuous v-ed(延续性动词) 某动作持续了多长时间例: It's 10 years since he lived here6. It was(not)… before…过(不)了多长时间某动作发生了例: It was not long before they arrived.四、It 作形式宾语用来替代作宾语的从句、动词不定式、动名词，而把真正作宾语的从句、动词不定式、动名词置于句尾。
人教版高中英语必修4课件 知识点——it 作形式主语
知识点——
it作形式主语
it作形式主语
【知识点解析】
动词不定式，动名词或主语从句作主语时，通常把它们放在谓 语动词前，而用it作形式主语，放到句首，常见句型有： 1. It + be + 形容词+主语从句 It is uncertain whether he can come to Jenny’s birthday party or not. 2. It + be + 名词词组 + 主语从句 这类名词有：a fact, a pity, a shame, an honor, a question等，如：
it作形式主语
【知识点解析】
7. It + be +名词词组 + 动词不定式
It is not a good habit to stay up too late.
8. It + be + 名词或形容词 + 动名词
这类名词和形容词常常是：good, no good, no use, a
waste of, useless, senseless等，如：
the lab? (MET88) A. everyone B. this C. her D. it
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高考总复习：it用法及强调句型真题再现1. Bach died in 1750, but it was not until the early 19th century ______ his musical gift was fully recognized. （2015重庆高考）A. whileB. thoughC. thatD. after2. It was when we were returning home ________ I realized what a good feeling it was to have helped someone in trouble. （2015湖南高考）A. whichB. thatC. whereD. how3. How would you like ______ if you were watching your favorite TV program and someone came into the room and just shut it off without asking you? （2015浙江高考）A. themB. oneC. thoseD. it4. If you’re buying today’s paper from the stand, could you get for me?A. oneB. suchC. thisD. that5. Studying Wendy’s menu, I found that many of the items are similar to ____ of McDonald’s.A. thoseB. oneC. anyD. all6. No matter where he is, he makes _____a rule to go for a walk before breakfast.A. him B this C. that D. it7. This is not my story, nor ______ the whole story. My story plays out differently.A. is thereB. there isC. is itD. it is1. C。
此题考查的知识点是强调句。
not until的强调句型：It is/was not until…that…。
故C正确。
2. B。
句子开头有It was…，如果去掉It was部分，余下部分是一个完整句子，判断这是强调句型。
强调句的固定结构为It is/was…that/who...，答案为that。
句意为：正是在我回家的时候我才意识到助人于危难中是多么令人高兴的事。
3. D。
句意：当你正在看一个你喜欢的节目时，突然有个人进来，一声不吭地关掉电视，你会怎么想？it作形式宾语，指代if后面的句子。
4. A。
根据句意：如果你去报摊上买今天的报纸，给我捎回一份好吗？one作“一个”，“一本”，“一件”等解，用来代替上文提到过的paper。
相当于a copy of paper.5. A。
those= that ones，代指前面的many of the items，表示复数、特指，被of McDonald’s 修饰，符合语境。
ones 表示复数、泛指，不符合语境。
6. D。
所填词做使役动词make的形式宾语，真正宾语是to go for a walk，选D。
7. C。
nor位于句首引起部分倒装，排除B、D；再根据句意“这并不是（关于）我的故事，它也不是故事的全部。
我的故事的结局不同。
”选代词it。
故答案选C。
知识讲解人称代词【链接】1. it的最基本用法是作代词，主要指上文刚提到的事物，以避免重复。
例如What's this? 在回答时要用It's a pen. 不再用This is a pen.They watched the train until it disappeared in the distance.2. 指动物或未知性别的婴儿：Is it a boy or a girl?Her new baby is tiny. It only weighs 2 kilos.Is this your dog? No, it isn’t.3. 指天气、时间、距离、环境等It’s a nice day today.It’s raining/snowing/sunny/windy.It’s Monday today.It’s lovely here.It’s twenty minutes’ drive to our university.用于不明确指代1. 在句子的主语不太明确时充当主语；Who is it there? It's I (me/you/he.....).I thought it was Mary, but it was not she.Her face lighted when she saw who it was.2. 泛泛的指某件事(有时泛指一般情况)；I hate it when people talk with a full mouth.It is noisy in this room.It doesn’t matter.It i s a shame, isn’t it?How is it going?It says in the newspaper that....3. it用在一些词组中，it没有特别的意思。
The last train's gone. Come on, we’ll foot it. (来，咱们步行吧。
)see to it that 注意,留意；关照that's it 插入语, 这正是所需要的got it 了解, 懂得作形式主语，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It is clear/obvious/ true/ possible/certain that...……清楚的（显然的，真的，可能的，肯定的……）It is very clear that he’s round and tall like a tree. = That he’s round and tall like a tree is very clear.It is important/necessary/right/ strange/ natural that...……是重要的(必要的,对的,奇怪的,自然的……)，that后的从句中要用虚拟语气（should + 动词原形），should可以省去，建议记住该句型中的形容词。
It is important that we (should) learn English well.It is necessary that he (should) remember these words.It is said /reported/ learned/believed/thought/known/told/hoped that...据说/据报道/据悉……It is said that he has come to Beijing.It is reported that another earth satellite has been put into orbit.It is suggested /advised/ordered/demanded/insisted/commanded that...据建议/有命令……，that后的从句要用虚拟语气（should +动词原形），should可以省；It is suggested that the meeting ( should ) be put off.It was ordered that we (should) arrive there in two hours.It is (about/ high) time that...从句用虚拟语气，动词用过去时did。
It is time that children went to bed.It is time you bought a new car.It is (high) time you made up your mind.It is/was the first /second ... time that从句(从句用现在完成时have done或过去完成时had done) 是第一（二）……次……It is the first time I have been here. = This is the first time I have been here.It is a pity /a shame /an honor/a good thing/a fact /a surprise/... that...that后的从句一般用虚拟语气（should + 动词原形），should可省去．表示出乎意料，常译为“竟然”。
没有这种意义时，则不用虚拟语气。
It is a pity that such a thing (should) happen in your class.It is a pity that he is ill.It happens /seems/ looks/ appears that...碰巧……，似乎是……，看起来……It happened (so happened) that he met his teacher in the street.It seems that he will be back in a few days.2.作形式主语替代不定式It is kind (of sb.) to do sth.不定式的逻辑主语是由of引起，主句中的形容词必须是能表示逻辑主语特征的褒义或贬义形容词。
常见的词有：bad，brave，careless，clever，cruel，foolish，good（好心的），honest，horrible，kind，lazy，modest，naughty，nice（有教养的），polite，rude，silly，stupid，wise，wrong（错误的）等。
It is kind of you to say so. = You are kind to say so.It is necessary (for sb.) to do sth.不定式的逻辑主语是由for引起，主句中的形容词通常是表示重要性、紧迫性、频繁程度、难易、安全等情况的中性形容词。