高中英语知识讲解 it的用法
高中英语It的用法
9. Meeting my uncle after all these years was an unforgettable moment, _____ I will always B treasure. Ａ．that Ｂ．one Ｃ．it Ｄ．What A 10. I prefer a flat in Inverness to ______in Perth, because I want to live near my Mom’s. A. one B. that C. it D. this 11. Cars do cause us some health problems — in B fact far more serious _______ than mobile phones do. A．one B．ones C．it D．those
Grammar It 的用法
1. it 作形式主语,代替不定式、动名词短语或主 语从句表示的真正主语： It is hard to deal with him. It is impossible for her to come. It is no good/use waiting here. It is evident that he is lying. It is not clear whether he will go or not. 2. it 作形式宾语,代替不定式、动名词短语或宾 语从句表示的真正宾语： I think it easy to repair the radio. I find it hard for her to do the math problems. He felt it no use learning English. I think it necessary that we should take exercise.
英语语法：高中英语It的用法
【导语】"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，⽆忧考整理了“it的⽤法”，欢迎阅读参考！更多相关讯息请关注⽆忧考！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。
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。
I.wa.the.tha.(who.cleane.th.classroo.yesterday.I.wa.i.th.stree.tha..me.he.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.no....unti....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...didn’.realiz.sh.wa..famou.fil.sta.unti.sh.too.of.he.dar.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.I.i.importan..necessary.right.strange.natural....tha....由于主句中的形容词不同, tha.后的从句中要用虚拟语气（shoul..动词原形）, shoul.可以省去。
高中英语It用法及其句型和固定搭配讲解
高中英语It用法及其句型和固定搭配讲解小编为大家准备了这篇高中英语It用法及其句型和固定搭配，帮助大家对it有更多了解。
接下来我们一起来看一看。
高中英语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 atoffice.(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 yourrudeness.(=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/ann oy/amaze/bother/concern/frighten/please/anger sb. that…例It worried me that she drove so fast.(= It was worrying that shedrove so fast.)(4) It verb (to sb.) that…= sb/sth verb to do(verb = appear, seem, come about, emerge, follow, chance, happen,occur, transpire, turn out , work out)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.)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 tomend 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) 某动作已有多长时间不发生了6.It was(not)…before…过(不)了多长时间某动作发生了四、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。
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。
高考英语It的用法
高考英语It的用法It是高考英语中一个极其重要的词，其用法多样，在不同的语境中具有不同的意义。
下面我们将从it的用法、句型和固定搭配三个方面进行讲解。
一、it用作实词1、表示时间、天气、距离、温度等自然现象。
例如：It is Monday today.今天是星期一。
It is raining outside.外面正在下雨。
It is 5 kilometers away from here.距离这儿有5公里远。
2、表示观点、看法、态度等主观想法。
例如：I think it is a good idea.我认为这是一个好主意。
We think it is important to learn English well.我们认为学好英语很重要。
二、it用作形式主语当不定式、动名词或从句作主语时，为了保持句子结构平衡，避免头重脚轻，常用it作形式主语，代替不定式、动名词或从句，而把真正的主语放在句尾。
例如：It is important to learn English well.学好英语很重要。
It took me an hour to finish the homework.我花了一个小时完成作业。
三、it用作形式宾语当不定式、动名词或从句作宾语时，为了保持句子结构平衡，避免头重脚轻，常用it作形式宾语，代替不定式、动名词或从句，而把真正的宾语放在句尾。
例如：I think it is important to learn English well.我认为学好英语很重要。
He found it hard to learn English well.他发现学好英语很难。
四、it用于强调句型中强调句型是英语中一个重要的句型，用于突出强调某个成分，特别是主语、宾语和状语等。
在强调句型中，it没有实际意义，只是起到引导作用。
例如：It is I who am the best student in my class.我是班里最好的学生。
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。
【高中英语】高中英语语法：It的完整用法
【高中英语】高中英语语法：It的完整用法除了课堂上的学习外，平时的积累与练习也是学生提高成绩的重要途径，本文为大家提供了高中英语语法：it的完整用法，祝大家阅读愉快。
it可用作人称代词、指示代词、先行词及引导词等。
1.人称代词it，就是第三人称单数中性，代表前文已提及过的一件事物。
例如：1)thatvaseisvaluable.it'smorethan200yearsold.那个花瓶很珍贵，它有200多年的历史。
2)iloveswimming.itkeepsmefit.我讨厌游泳，它能够并使我维持身心健康。
当说话者不清楚或无必要知道说话对象的性别时，也可用it来表示。
如：3)it'salovelybaby.isitaboyoragirl?宝宝真可爱，就是男孩还是女孩?it可用来指代团体。
如：it用来替代命令代词this,that.如：5)---what'sthis?---it'sapen.—这是什么?—是一支钢笔。
6)---whosebookisthat?---it'smike's.—那就是谁的书?—就是迈克的。
2.指示代词it，常用以指人。
如：7)goandseewhoitis.回去看一看就是谁。
8)---whoismakingsuchanoise?—是谁发出这样的吵闹声?---itmustbethechildren.—一定就是孩子们。
3.虚义it无指代性，常用作没有具体意义的主语，出现于表示天气、气候、温度、时间、地点、距离等意义的句子中。
如：9)itishalfpastthreenow.现在就是三点半钟。
10)itissixmilestothenearesthospitalfromhere.这里离最近的医院也有六英里。
11)itwasverycold;itsnowedandgrewdark.天气很冷;天下着雪，渐渐地变黑了。
以上就是为大家整理的高中英语语法：it的完备用法，期望同学们写作后会对自己有所协助，预祝大家写作开心。
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。
高中英语语法it的用法
高中英语it的用法一、代词itA. heB. thatC. itD. theman3. Tom's mother kept telling him that he should work harder, but didn't work.A. heB. whichC. sheD. it4. —How _____ going?— Everything is OK.A. is itB. are theyC. is thatD. arethese5. — He was nearly drowned once.— When was ______ ?— _______ w as in 1998 when he was in middle school.A. that... ItB. this... ThisC. this... ItD. that...ThisKeys:1-5. D C D A A二、引导词it专项练习1. _______ is a fact that Global Warming has influenced human beings' life.A. ThereB. ThisC. ThatD. It2. It is wrong _______ treat your mother like that.A. that you toB. of you toC. for you toD.because you3. Is _______ n ecessary to complete the task before National Day?A. thisB. thatC. itD. he4. Does _____ matter if he can't finish the job on time?A. thisB. thatC. heD. it5. He hasn't had any food for two days. that he is so hungry.A. There is no pointB. There is no needC. It is no wonderD. It is no way6. ______ h e has been fired because of his absence for a long time with no reason.A. It is said thatB. They all said thatC. That is announced thatD. It was reported7. It is no use _____ books without reading.A. to buyB. in buyingC. of buyingD.buying8. _______ h uman beings can live on the moon in the next twenty years.A. There seems impossibleB. This is impossible forC. It is impossible ofD. It seems impossible that9. _______ i n the school regulation that students should wear school uniforms at school.A. What is requiredB. What requiresC. It is requiredD. It requires10. —How do you know him well?— ______that we live in the same neighbourhood.A. It isB. That isC. It is becauseD. Ithappens11. I don't think possible to complete the task without good preparation.A. thisB. thatC. heD. it12. I hate ______ when people talk with their full mouth.A. itB. thatC. theseD. them13. He _______ to do morning exercise in the park.A. took a ruleB. made a ruleC. made it a ruleD. tookit a rule14. I would appreciate _____ you would turn off the TV set.A. thatB. it ifC. these ifD. itthat15. I think _____ hard for you ______ t he task on your own.A. it is... doB. this... to doC. that is... doingD. it...to do16. Don't ______ for granted that he will keep his promise.A. take thatB. take itC. make thatD. makeit17. He soon ______ w hy he had done it.A. spoke clearlyB. made it clearC. told clearD. saidit clear18. Do you think _____ no use ______ another apology to him?A. it... to makeB. it is... makeC. it... makingD. that...of making19. We should regard _____ as a social duty to help these poor and homeless people.A. ourselvesB. theseC. itD. us20. I found ______to watch the football match on TV.A. it relaxingB. that is relaxingC. it relaxedD. thatis relaxedKeys:1-5 DBCDC 6-10 ADD CD11-15 DACBD 16-20 BBCCA三、it在强调结构中专项练习1.It was who telephoned me yesterday.A．him B．his C．himself D．he2. was a handbag that John gave Mary at Christmas.A．It B．This C．That D．Such3.Was the room the famous writer had ever lived in?A．that, it B．it , that C．it , where D．that, which 4.Why is it everyone thinks he’s a thief?A．because B．as C．when D．that5. is known to us Mary dances best.A．She, ×B．It, that C．It, she D．She, who Keys:1-5 AABDBKeys:1-5 DCDDA练习题：单项选择1. _______ that I was watching TV when he came to see me.A. It happenedB. What happenedC. That happenedD. It was happened2. The chairman thought necessary to invite Professor Smith to speak at the meeting.A. thatB. itC. thisD. him3. The Foreign Minister said, " ____ our hope that the two sides will work towards peace."A. This isB. There isC. That isD. Itis4. ______ is reported in the newspaper that the terrible flood has caused a loss of 10 million yuan.A. ItB. ThisC. ThatD. As5. It's up to you whether we should go to the art exhibition right now.A. decidingB. to decideC. of decidingD.decide6. Was ________ that I saw last night at the corner?A. it youB. not youC. youD. thatyourself7. It is about two months James leaves school. He is going to be a lawyer.A. whenB. beforeC. sinceD. that8. ______ turn is ______ to clean the blackboard?A. Which... itB. Whose... itC. Which... thatD.Whose. .. that9. The seriously injured man has stopped breathing. will be no possibility ofmaking him come to life.A. ItB. ThereC. ThatD. This10. Space exploration has been made with the development of modern science.A. it possibleB. it wasC. that being possibleD.possible11. To improve my spoken English, I make to recite a passage of English every day.A. a ruleB. it a ruleC. a rule thatD. arule it is12. He moved to a new flat because is only five minutes' walk from the new flat to his office.A. itB. thisC. thatD.there13. It was _______ several years I had an opportunity of seeing the bird again.A. for... beforeB. not for... thatC. for... whenD. notfor... then14. It was with the greatest difficulty the boy gathered the strength to rise.A. with whichB. thatC. whichD.what15. It is of great help Radio English on Sunday. It is well received.A. to pick upB. of picking upC. to pickD.picking upKeys: 1-5 ABDAB 6-10 ABDBD 11-15 BABBA基础题：一．单项选择：1. It is high time that our child to do some homework.A. learnedB. learnC. will learnD.would learn2. It is essential that every child the same educational opportunity.A. hasB. could haveC. haveD. had3. It was going to be some time he saw his parents again.A. sinceB. untilC. whenD.before4. _______ the 1500's_______ the first European explored the coast of California.A. It is not until... thenB. It was until... thatC. It's not until... whenD. It was not until... that5. I just wonder ________ that made them so depressed.A. why it didB. what they didC. how it wasD.what it was6. It was eight o'clock I got to the school this morning, made our teacher very angry.A. when... thatB. that... thatC. that... whenD.when... which7. ______ , they all went to the lake to swim.A. It was a hot dayB. Being a hot dayC. It being hotD. For it was a hot day8. I don't mind her criticizing me, but is how she does that I object to.A. itB. thatC. thisD.which9. — ______ seems to be something wrong with the machine.—Yes, _____ got a lot of noise.A. It... it'sB. There... it'sC. It... there'sD.There... there's10. ______ a certain doubt among the workers as to the necessity of the work.A. There areB. There isC. They areD. Itis11. Joan had often heard said that Marley had no money.A. oneB. onceC. itD. her12. When you go outing with your sisters, you must see to that they are safe.A. everythingB. itC. thatD.yourself13. He said, " a long way to school. a long way to go yet before we arrive."A. It is... There isB. There is... It isC. There is... There isD. It is... It is14. —Is it my age the boss minds?—I'm afraid not. He will consider necessary to have an experiencedassistant.A. which... itB. that... itC. which... thatD.that... that15. ______ easy to do the repair. All you need is a hammer and some nails.A. You areB. That isC. There isD. ItisKeys:1-5 ACDDD 6-10 DCABB 11-15 CBABD提升题：一、翻译。
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1. it 作为人称代词在句子中代替一个名词或代词，作为主语、宾语、表语或形式宾语等。
例句：It is raining heavily.The book is interesting. I love it.I find it difficult to understand.2. it 作为代词形式的宾语用在像 think, believe, find, consider, call 等动词后面，作为宾语，这些动词有时常被称为“感觉类动词”。
例句：I find it hard to believe that he would do such a thing.They called it a day and went back home.I consider it a waste of time to keep trying.3. it 作为形式宾语用在像 make, find, see, hear, feel 等动词后面，表示动作的对象。
例句：They made it clear that they would not accept the offer.I find it interesting to learn new things.I saw it with my own eyes.4. it 作为虚拟主语或虚拟宾语用在像 suggest, insist, demand, prefer 等动词后面，表示虚拟语气。
例句：The boss suggested that it would be better to start the project next month.She insisted that it was her right to make the decision.I demand that it be done as soon as possible.5. it 作为强调的主语或宾语用在像 be, have 等动词后面，表示强调。
高中英语it 用作形式主语宾语的用法及24个it句式盘点总结(有习题)
高中英语it 用作形式主语/宾语的用法及24个it句式盘点总结一、用作形式主语当不定式、动名词、从句等用作主语时，避免头重脚轻，通常在句首使用形式主语it，而把真正的主语放在句子末尾。
如：It is stupid to do such a thing. 做这种事真蠢。
It’s no good sitting up too late. 熬夜没有好处。
It is necessary that he should be sent there at once. 有必要马上派他到那里去。
注：类似以下句子中的it也可视为形式主语：It happened that the harvest was bad in 1988. 碰巧1988年的收成很不好。
It seems that she is afraid to tell them about it. 似乎她怕将此事告诉他们。
二、用作形式宾语当不定式、动名词、从句等用作宾语且其后跟有宾语补足语时，就应在宾语补足语前使用形式宾语，而将真正的宾语移至句末。
如：I’ve made it a rule never to hurry. 我已养成凡事从容不迫的习惯。
Do you think it possible to root out crime? 你认为可以根除犯罪吗?He found it difficult to breathe at high altitudes. 他觉得在高空呼吸困难。
注：通常意义的形式宾语主要见于真正宾语为不定式、动名词、从句等且其后跟有宾语补足语时的情形，即用于“动词+it+宾语补足语+真正的宾语”这样的结构，但以下两类形式宾语却比较特殊，其后没有宾语补足语：1. 由于介词后通常不能直接跟that从句作宾语，有个别特殊结构就在介词后先接it作形式宾语，再跟that从句。
如：You may depend on it that it is true. 你可以相信这是真的。
高中英语浅谈it作形式主语和形式宾语用法
) It was really surprising that she married a man like that. (她嫁给那样的男 士真让人惊讶。) ② It + be +名词词组 + doing / that …. e.g. It is no good telling lies. (撒谎没好处。) It is a pity that you didn’t go to see the film yesterday. (你昨天没看成那部电影真遗憾。) It is a truth that there would be no new China without the Communist Party. (没有共产党就没有新中国，这 是毋庸质疑的。
至少有十七万人在2004年那场海啸中丧生。) ④ It + seems / appears / happens 等不及物动词 + that …. e.g. It seems that he enjoys pop songs very much. (似乎他非常喜欢流行歌曲。) It appears that Tom might change his mind. (看来 汤姆可能会改变主意。) ⑤ 若句子是疑问形式，就只能用it作形式主语。 e.g. Does it matter much that they won’t come tomorrow? (他们明天不来很重要吗？) Is it true that he will go abroad next week? (他下周出国是真的吗？
浅谈it作形式主语和形式 宾语用法
演讲人
It作形式主语和形式宾语用法，是中学阶段英 语学习的主要语法项目之一。纵观历届高考题， 无论是单项选择，还是完行填空，it用法始终 是反复考查的重、热点之一。现将it作形式主 语和形式宾语用法，进行如下归纳分析，以供
高中英语之it的用法详解
高中英语之it的用法详解首先先讲一下it的用法，然后在出几道题一、考点聚焦1、it的基本用法（1）用作人称代词，代替前文提到过的事物。
The train has arrived. It arrived half an hour ago.（2）用以代替提示代词this, that。
—What’s this?—It’s a knife.—Whose watch is that? —It’s mine.（3）起指示代词的作用，指一个人或事物。
—Who is knocking at the door? —It’s me.（4）指环境情况等。
It was very noisy (quiet) at the very moment.（5）指时间、季节等。
—What time is it? —It’s eight o’clock.It often rains in summer here.（6）指距离。
It is a long way to the school.（7）作形式主语。
It is not easy to finish the work in two days.It is no use crying over spilt milk.It is as pity that you didn’t read the book.（8）作形式宾语。
I think it no use arguing with him.I found it very interesting to study English.He made it clear that he was not interested in that subject. （9）用于强调结构。
It was Xiaoming whom(that)I met in the street last night.It was in the street that I met Xiaoming last night.It ws last night that I met Xiaoming in the street.It was I who met Xiaoming in the street last night.2、含有“It is …”的句型（1）It is time (for sb.) to do sth.It is (high) time that sb. did sth.(虚拟语气)（2）It is + 形容词（+of / for sb.）+ to do sth.通常用 of的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。
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it的用法（1）编稿：牛新阁审稿：王春霞概念引入小词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。
The baby is crying. It might be hungry. 婴儿在哭，或许饿了。
—Someone is ringing. Who might it be? 有人按门铃，可能是谁呢？—It must be my friend Tom．He (不可用It) wants to see you．一定是我的朋友汤姆，他想要见你。
2. 作非人称代词it用作无人称的主语，不指物，而表示时间、天气、气候、季节、距离等自然现象，或指事物的状态。
What a long way it is from Beijing to London! （it 指距离）从北京到伦敦是多么长的一段距离啊！It was nearly midnight when she came back. （it指时间）她回来时快半夜了。
It was very quiet in the café. （it指环境）咖啡馆里静悄悄的。
It’s early spring, but it’s already very hot. （前面的it指季节，后面的it指气温）刚是初春，但是已经很热了。
If it hadn’t been for the snow, we could have climbed over the mountain. （it指情况）要不是因为下雪，我们可能已经翻越了那座山。
易误辨析区别it，one，it，that和which1. it指上文出现过的同一事物，而one则泛指与前面事物同属一类中的一个。
This was the last dictionary in that bookstore. So I took it.（it特指前面提到的那本词典）这是那家书店最后一本词典，所以我买下了它。
There are many dictionaries in that bookstore. So I bought one. （one泛指其中之一）那家书店有许多词典，所以我买了一本。
2. that做代词替代前面提到的事物, 可数名词、不可数名词皆可。
代替可数名词可以用the one替换。
that的复数形式为those,只可替代可数名词复数,在句中相当于the ones。
The head teacher in your class is younger and more active than that in theirs.你们班的班主任比他们班的班主任年轻而且更活跃。
The students who do best in the exam are not always those with the best brains.考试考得最好的学生并不总是那些最聪明的学生。
3. that在并列分句中,可以替代前面某一个名词或整个句子内容,可用it替换.She heard a terrible noise, and that brought her heart into her mouth.她听见一个可怕的声音，让她的心跳到了嗓子眼。
4. it和which都可以用来指某一件事，关键要看中间是否有并列连词，如果有就用it，反之用which。
The Smiths bought a new house, but it will need a lot of work before they can move in.史密斯家买了一座新房子，但是搬进去之前还需要大量的工作。
（it 指代前面提到的那所房子，此句的关键词是but，连接两个分句，it是分句的主语）The Smiths bought a new house, which will need a lot of work before they can move in.（因为没有连词，不能用it；which代表先行词house在定语从句中作主语。
）He was badly ill, and it made his mother worried. 他病了，那使他母亲很担心。
（it指代“他病了”这件事，注意and。
）He was badly ill, which made his mother worried.（which代表前面整个主句，在定语从句中作主语）【高清课堂：Unit 3语法精讲it做形式主语】it作形式主语it作形式主语和形式宾语时，一般称为引导词，引出特定的句型。
it作形式主语,代替由不定式,动名词或从句表示的真正主语。
不定式、动名词或从句都可以作主语，如：To say is one thing, and to do is another. （不定式作主语）说是一回事，做是另一回事。
Seeing is believing. 眼见为实。
（动名词作主语）That he is a hero is true. (从句作主语)当主语过长时，就会有不平衡感，为了句子的平衡、美观，我们引入了引导词的概念。
1) 代替由不定式表示的真正主语句型：It is + adj. / n. +for/of sb. to do sth.It is impolite to talk loudly in public places. 在公共场合大声说话是不礼貌的。
（it代替不定式“to talk loudly in public places”）为什么形容词后有时用for，有时用of呢？仔细观察这两个句型：It is important (necessary, possible, impossible, easy, hard, difficult…) for sb. to do sth.It is nice (cruel, kind, rude, wise, stupid, clever, foolish, polite…) of sb. to do sth.我们可以得出这样的结论：当形容词只是修饰这件事时，用for sb.，我们可以称为“单层修饰”；如果形容词看上去是修饰人的，而且事情做出来也肯定是这样的，即形容词既修饰人，也修饰物时，用of。
例如：我们学英语很重要。
It’s important for us to learn English.important是修饰“我们”，还是修饰“学英语”这件事呢？修饰“学英语”这件事，所以用for。
再如：你帮助我真好。
It’s very kind of you to help me.第一，“你”是好的；第二“帮助我”这件事也是好的，所以双重修饰就用of。
2）可代替动名词表示的真正主语。
It’s no use crying over spilt milk. 覆水难收。
It’s no good taking in much fat and sugar. 吸收过多的脂肪和糖没有好处。
It’s no fun watching the same movie for a second time. 同一部电影再看一遍没有意思。
这里crying...等动名词短语是真正的主语，it代替它们作形式主语。
这些句型与前面的句型类似，那么什么时候要加-ing形式呢？我们只需记住，动名词的这种句型是比较少的，记住一些固定用法即可，如在高考中经常出现的It’s no use/ no good/ no fun doing sth. 做某事没有用/没有好处/没有意思。
3）代替主语从句It’s a pity that I didn’t think of it earlier. 我没有早一点这么想真是遗憾。
It is a well-known fact that smoking can cause cancer.吸烟会引起癌症是尽人皆知的事实。
it代替that引导的主语从句作形式主语。
注意：选it还是as：It is well known to all that the earth is round. 众所周知，地球是圆的。
这个句子中it代替that引导的从句作形式主语，经常会与下面这个定语从句的句型混淆：_______ is well known to all, the earth is round.这个句子中，第一个典型特征是逗，第二是逗后没有that，也就没有形式主语了。
空白处应该填As。
As代替后面的句子“the earth is round”，在定语从句中作主语。
这两种形式要清晰地记住。
4）注意以下固定句型：It seems (ed) / appears (ed) that ... 似乎......It (so) happened that ... 碰巧.....It turns (ed) out that... 结果是It occurred to sb. that ... 某人突然想起......It is said / reported / believed / hoped / well known / suggested ... that...据说/据报道/大家都相信/人人都希望/大家都知道/有人建议...... ■例如：It so happened that the tickets were sold out. 碰巧票都卖光了。