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语法：it的用法一.it 作人称代词1.it的最基本用法是作代词，指代前面所提到过的事情、事物、群体、想法，也可以指代未指明但谈话双方都明白的事情或情况。
如：The Parkers bought a new house but it will need a lot of work before they can move in.---I have broken a plate.---It (Breaking the plate) doesn’t matter.2.it也可以指代性别不明或性别被认为不重要的人或动物。
如：---Is it your dog？---No, it isn’t.二.it 作非人称代词1.指时间It is half past two now.2.指距离It is 6 miles to the nearest hospital.3.指温度It is very cold in the room.4.指天气A lovely day, isn’t it?/ It is a bit windy.5.指日期---What’s the date today? --- It’s May 1st, 2014.6.指季节It is winter now.7.指环境It was very quiet in the café.8.指价值---What’s the price of the T-shirt？---It is 150 yuan.三.it作形式主语1.it替代作主语的动词不定式（to do）(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, possible, right, important, polite, clear, obvious, useful, dangerous, legal, illegal等。
【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。
英语语法详解：代词it的用法总结it是最常见的代词之一，用法很广泛。
虽然考察it的题型有很多，如阅读理解、完形填空、语法填空、短文改错等，但大多不属于难点。
因此，学习代词it的用法是一件相对轻松的事情。
相信每个人在英语学习初期，会发现在很多不同的语境下都会使用代词it，足以说明其用法的广泛性。
代词it看似简单，但并不代表每个人都能了解它的全部用法，尤其是在高考考点会涉及到的用法。
下面，就简要总结代词it的常见用法。
it的用法一：it用作代词（1）it用作人称代词it用作人称代词，一般指未知或不明身份的人。
例句：Who is it in the room? Open the door!谁在房间里啊？把门打开！（2）it用作指示代词作指示代词时，it的用法相当于this或that。
有时候it并不特指某件具体的事物，而是代表前面提到的、或者即将提到的某件事情。
例1：She said it was a very popular film，but I don't like it.她说那是一部非常流行的电影，但我却不喜欢（它）。
例2：She does not really treat me as a family member，and it has hurts me badly.她并没有把我当家人看待。
这就让我很受伤。
（3）it作非人称代词代词it还可以用来指代时间、距离、价值、天气、温度、环境等无生命的抽象事物，无阴阳之分。
例1：—What time is it by your watch?你的表到几点了？—It is 9:39 9点39。
例2：It is really quiet in the woods.小树林里真安静。
It的用法二：it用作形式主语或形式宾语（1）it作形式主语当句子的主语是动词不定式、动名词或名词性从句时，为了避免头重脚轻的句式结构，我们往往把主语部分放在谓语的后面，而用it作为形式主语放在句子的开头处。
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。
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。
语法专项复习：IT的用法一、人称代词1. it指刚提到的事物本身, 以避免重复:例如: They watched the train until it disappeared in the distance.one用来替代前面出现的单数名词，泛指，相当于a/an+单数名词。
ones用来替代前面出现的复数名词，泛指。
the one 用来替代前面出现的特指的单数名词；the ones 用来替代前面出现的特指的复数名词；that与所指名词为同类，但不是同一个；用来替代前面出现的特指的单数可数名词或特指的不可数名词。
it 表示特指，与所指名词为同一个。
用来替代前面出现的单数名词2. 指动物或婴儿(未知性别的婴儿或孩子);或不重要的人, 常见于敲门或打电话:例如: 1) Is this your dog？No, it isn’t.2) They got a baby and it was a ten-pounder二、非人称代词1. 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：⑴.指天气：It is a lovely day, isn’t it?⑵.指时间: It was nearly midnight when she came back.⑶.指日期: It is April First today.⑷.指距离: It is some 3000 kilometers from A to B.⑸.指价值: It is three dollars.⑹.指温度: Today it is 30 degrees centigrade.2. 作形式主语: 当句子的主语为不定式、动名词(doing)或主语从句时，为保持句子的平衡，常把真正的主语移到句末；用it作形式主语放在句首，it无具体的意义。
“It”作形式主语的句型：1) It is/was +名词( no wonder, an honor, a good thing, a pity, no surprise…)＋主从例句：It is a pity that we can’t go.2) It is/was ＋形容词(obvious, natural, surprising, wonderful, possible, likely, certain…)＋主语从句例句：It is clear that Tom has returned.3) It is/was＋过去分词(said / reported / believed / known / thought / expected / decided / announced / arranged…)＋主语从句例句：It is said that President Jiang will visit our school next week.4) It＋动词(happens /occurs / seems…) ＋主语从句例句：It occurred to him that he failed in the examination.5) It doesn’t matter how/whether…例句：It doesn’t matter whether he is wrong or not.6) It is time ( about time, high time ) + that从句(虚拟语气:动词用过去时did)例句：It is time that children went to bed.7) It is the first ( second ... ) time + that从句(从句用现在完成时have done )It was …(从句用过去完成时had done )例句：It is the first time I have been here. = This is the first time I have been here8) It is difficult/easy… for sb. to do sth.It is typical/nice/kind… of sb. to do sth.例句：It is kind of you to say so. = You are kind to say so.It is important for her to come to the party.9) It is no use/useless/no good/ a waste of time doing sth.例句：It is no good learning English without speaking English.It’s useless trying to argue with Shylock.10) It takes sb. some time/ some money to do sth.: 做．．．要花费某人．．．例句：It took thousands of people many years to build the Great Wall.11) 其它常见句型:1. It is + 时间段+ since sb. did sth.: 自…以来已经有多久了例句：It is six years since you began to learn English.2. It will be + 时间段+ before sb. do sth. 要过…时间，才……3. It was long before sb. did sth.. 过了很久才……4. It wasn’t long before sb. did sth. 没过多久就……5. It will be long before sb. do sth. 要过很久才……6. It won’t be long before sb. do sth. 过不了多久就……7. It is up to you whether to go. 是否去由你决定。
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。
it句型归纳总结大全"it"句型是英语中常见的一种句型结构，通常用来强调或者指代特定的事物或情况。
下面是对"it"句型的归纳总结：1. 强调句型：It is (was) + 被强调的部分 + that/who + 其余部分。
例，It is the book that I want to read.（我想读的就是这本书。
）。
例，It was Mary who broke the window.（打破窗户的是玛丽。
）。
2. 虚主语句型：It + be + 形容词 + to do.例，It is important to learn English well.（学好英语很重要。
）。
3. 虚宾句型：It + be + 名词 + to do.例，I find it a pleasure to work with you.（我觉得和你一起工作很愉快。
）。
4. 指代句型：It + be + 形容词 + (for sb.) + to do sth.例，It is easy for me to solve the problem.（对我来说解决这个问题很容易。
）。
5. 天气句型：It + be + adj. + (for sb.) + to do sth.例，It is hot for us to go out.（对我们来说出去很热。
）。
6. 距离句型：It + be + 距离 + to + 地点。
例，It is five kilometers to the station.（离车站还有五公里。
）。
以上是对"it"句型的归纳总结，希望对你有所帮助。
如果你还有其他问题，欢迎继续提问。
语法专题十：it的用法1.指代事物、动物、婴儿或未知的人。
2.指天气、时间、距离、自然现象、环境等。
3.代替不定式，作形式主语或形式宾语(常与feel, consider, find, believe, make, take,imagine, think, suppose, regard等连用)。
4.代替动名词，作形式主语或形式宾语：It is no good / no use / useless / dangerous + doingI think it no good / no use / useless / dangerous + doingI think it no use complaining about their prejudice.5.代替主语从句、宾语从句，作形式主语或形式宾语：It seems / appears / happens / turns out / proves + that…It is certain / likely / possible / probable + that…We have made it clear that she has nothing to do with the case.6.用于强调句：It is / was … that / who…A student witnessed the car accident at the turning last night.(1 ) ( 2 ) ( 3 ) ( 4 )(1) _________________________________________________________.(2) _________________________________________________________.(3) _________________________________________________________.(4) _________________________________________________________.It is not until +被强调的部分+ that…I didn’t realize she was a famous film star until she took off her dark glasses.________________________________________________________________.7. 其他重要句型：It is important (necessary, right, strange, natural) that…（should+动词原形）It is said (reported, learned…) that…It is suggested (ordered…) that…（should）+动词原形It is a pity (a sham) that …（should）+动词原形It happens (seems, looks, appears ) that...It occurs to sb. to do / that…：使某人想起……It is/ has been +一段时间+ since ...+过去时It will be +一段时间+ before ...It looks ( seems ) as if …It is no wonder…：难怪When it comes to…：当谈到……It comes about that…：发生8. appreciate, love, like, hate, see to(负责，注意) + it + 从句巩固练习：1. It took us over an hour ______ along the street.A. walkB. to walkC. walkingD. walked2. I think it a great honour ______to visit your country.A. to inviteB. invitingC. having invitedD. to be invited3. Many people now make ______a rule to buy cards for their friends before Christmas.A. themselvesB. itC. thatD. this4.______is very clear to everyone that he's round and tall like a tree.A. ThisB. WhatC. ThatD. It5. ---It is raining cats and dogs.---______ .A. So it isB. So is itC. Neither it isD. Neither is it6. It's no use ______over spilt milk.A. cryB. cryingC. that you cryD. for you to cry7. It is important ______ their offer.A. rejectB. rejectsC. to rejectD. rejecting8. Has ______been decided when we are to hold the sports-meeting?A. thatB. thisC. itD. what9. ---Did Li Lei call me while I was out?---Yes, it was ______ that called you.A. h imB. heC. whoD. whom10. I don't know ______makes her afraid of having her business discussed.A. what it is about Mary thatB. that is it abut Mary whatC. what is it about Mary thatD. that is about Mary what11. It was with great joy ______ he received the news that his long lost son would return home.A. asB. thatC. soD. for12. I don't think ______difficult for a student to master a foreign language within five years.A. thatB. itC. tooD. very13. It's the second time you ______ late this week.A. arrive B .arrived C. have arrived D. had arrived14. It will not be ______we meet again.A. long beforeB. before longC. soon afterD. shortly after15. It's demanded that we ______there on foot.A. not to goB. don't goC. not goD. won't go16. It was not until 1936 ______ basketball became a regular part of the Olympic Games.A. thatB. whenC. whichD. then17. ______ you met the Englishman?A. Where it was thatB. Who it was thatC. Where was it thatD. Where was that18. ______ certain that his invention will lead to the development of production.A. That'sB. This isC. It'sD. What's19. Tom's mother kept telling him that he should work harder, but ______didn't help.A. heB. whichC. sheD. it20. It is important that she ______with Mr. Williams immediately.A. speakB. spokeC. will speakD. to speak21. ______that there’s another good harvest this year.A. It saysB. It is saidC. It was saidD. He was said22. I really appreciate ______ if you can lend your computer.A. thatB. whatC. itD. which23. I didn’t ______ her ______ for help.A. occur; to askB. occur to; to askC. occur to; askingD. happen to; that to ask。
it 和them的用法使用"it"和"them"的正确方式引言：在英语语法中，我们经常会遇到代词的使用。
其中，"it"和"them"是两个常见的代词，在不同情境下有着不同的用法。
本文将详细介绍并解释如何准确地使用这两个代词。
一、 "it"的用法1. 作为主语：a) 描述天气：例如，"It is raining."（在下雨）b) 描述时间和日期：例如，"It is 9 o'clock."（现在是9点）c) 引出论题或观点：例如，“It is said that laughter is the best medicine.”（据说笑是最好的药）2. 作为形式主语：a) 当关于时间、天气或环境的真正主语太长或复杂时，可以使用形式主语"it"。
例如，"It is important to exercise regularly."（定期锻炼很重要）3. 作为强调句子中的句型元素：a) 强调某人/某物具备某种特征时：例如，“It was John who won the race.”（是约翰赢得了比赛）4. 在特定动词短语中充当宾语：a) 表示存在感觉(感觉、听到、看到等): 例如，“I can hear it singing in the trees.”（我能听到树上有鸟在唱歌）二、 "them"的用法1. 作为复数的人称代词:a) 指代前文中提到的复数名词：例如，“I saw my friends yesterday. I talked to them for hours.”（昨天我见到了朋友。
我和他们聊了好几个小时。
）2. 作为不定代词：a) 泛指某个或某些事物，常与"of"连用：例如，“I need some books, but I don't have any of them.”（我需要一些书，但是我没有任何一本。
动词不定式it的用法在英语学习中，动词不定式是一个重要的语法点，而其中“it”在动词不定式中的用法常常让学习者感到困惑。
下面我们就来详细探讨一下这一用法。
首先，我们要明白什么是动词不定式。
动词不定式是一种非谓语动词形式，通常由“to ＋动词原形”构成，比如“to do”“to go”“to study”等。
它在句子中可以充当主语、宾语、定语、状语等成分。
当“it”用于动词不定式结构中时，主要有两种常见的句型：“It ＋ be＋形容词＋ for/of sb ＋to do sth”和“It takes/took sb ＋时间＋to do sth”先来看第一种句型“ It ＋ be ＋形容词＋ for/of sb ＋to do sth” 。
在这个句型中，“it”作形式主语，真正的主语是后面的动词不定式“to do sth”。
使用“for”还是“of”，要根据前面的形容词来决定。
如果形容词是描述事物的性质、特征的，比如“difficult”“easy”“important”“necessary”等，就用“for”；如果形容词是描述人的品质、性格的，比如“kind”“clever”“foolish”“nice”等，就用“of”。
比如说，“It is important for us to learn English well” 这里“important”是描述“学好英语”这件事的重要性，所以用“for”。
而“It's kind of you to help me” 这里“kind”是形容“你”这个人善良，所以用“of”。
再看第二种句型“It takes/took sb ＋时间＋to do sth” ，这个句型表示“做某事花费某人多少时间”。
例如，“It took me two hours to finish my homework yesterday” 意思是“昨天我花了两个小时完成作业”。
此外，还有一种比较特殊的情况，就是“it”作形式宾语。
