高三 高中It用法总结归纳
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。
高中英语语法——It的用法
高中英语It的用法一、代词It1.用作人称代词，代替上文出现的同一个事物，既可以指代可数名词，也可以指代不可数名词, 其复数形式是them。
如：---Have you seen my pen? ---Yes, it’s in the desk.★ it可以指人，多指婴儿或指身份不明的人（通常是只闻其声，不见其人时）。
例如: ---Who is knocking at the door? ---It must be Tom.★ it与one和that的区别：one指代单数可数名词，泛指同类事物中的一个；其复数形式是ones，泛指一些。
如：I prefer a flat in east district to one in west district.that用来替代前面提到的特指事物，既可以指代单数可数名词，也可以指代不可数名词。
代替单数可数名词可以用the one替代。
其复数形式是those,指代复数名词，表特指。
如：The weather here is not so good as that there.The days in summer are longer than those in winter.2. it用以代替指示代词this和thatA：Whose umbrella is that?B：It’s Mary’s.3. it用作非人称代词，表示时间、日期、地点、天气、温度、距离、环境等。
It’s a beautiful day.It’s time for the meeting.课堂练习1. Tom's mother kept telling him that he should work harder, but ____didn't help.A. heB. whichC. sheD. it2. We’ve been looking at the houses but haven’t found ____ we like yet.A. oneB. onesC. itD. them3. The Parkers bought a new house but ____ will need a lot of work before they can move in.A. theyB. itC. oneD. which4. I was disappointed with the film. I had expected ________to be much better.A. thatB. thisC. oneD. it5. ---Do you like ___ here?---Oh, yes. The air, the weather, the way of life. Everything is so nice.A. thisB. theseC. thatD. it6. We need a new cupboard for the kitchen. So Peter made ____ from some wood we had.A. itB. oneC. himselfD. another答案：DABDDB二、引导词it1. it用作形式主语It is uncertain whether he can come to Jenny’s birthday party or not.It’s a pity that you missed the exciting football match.It remains a question whether he will come or not.It is reported that 16 people were killed in the earthquake.It happened that I was out when he called.It’s necessary for the young to master two foreign language.It is no use arguing about the matter with him.2. it用作形式宾语动词+形式宾语+宾语补足语+真正的宾语。
it用法总结高中
it用法总结高中【导语】作者在这里给大家带来it用法总结高中（共17篇），希望大家喜欢!篇1：高中it用法总结it作人称代词：1、指代事物。
作为人称代词，it 可以指除人以外的一切事物或动物。
如：Sam picked up some knowledge of the puter just by watching others working on it. 山姆只是凭借看别人操作电脑就学到了一些电脑知识。
(指the puter) (山东)2、指代人。
主要用于指婴儿或未知的人。
如：I was just going to cut my rose bushes but someone had done it. Was it you? 我正要剪切我的玫瑰丛但(发现)有人已经这样做了。
是你干的吗？(未知的`人) (湖南某)3、代替某些代词。
代词 it 还可用于代替指示代词this, that 以及复合不定代词 something, anything等。
如：—What’s this / that? 这/那是什么？—It’s an orange. 这/那是一个橘子。
it作非人称代词：1、it用于指时间、距离、价值、自然现象、环境等。
如：It rained heavily in the south, causing serious flooding in several provinces. 南方下了大雨，在几个省造成了严重洪灾。
(指自然现象) (天津某)2、it指代前面提到过的或谈话双方都明白的事情或情况。
篇2：it用法总结高中I didn't mean to break it— it was an accident.我不是故意打碎它的—这是个意外。
If it doesn't fit, you can always take it back.要是它不合适，你总还可以把它退回去嘛。
It didn't seem worthwhile writing it all out again.把这再都写出来似乎不必要。
高中英语it的用法课件-(详细有高考题-精品)
动词 +it + that + clause
enjoy, like, / love, dislike, appreciate hate, don't mind, be fond of, feel like, see to / depend on / insist on
例 : I hate it you can dance so well but I can't.
2.非人称代词it
it有时并不指具体的东西，而泛指天气、时间、环境等， 称为非人称的it： ⑴.指天气：
It is a lovely day, isn’t it? It is a bit windy.
⑵.指时间:
It was nearly midnight when she came back.
⑶.指环境:
no good 3. S + V + it +
no use
+ doing sth.
形式宾语归纳
该句型中的it 作形式宾语，记忆方便---“6123结构”。
6 主句中常用的动词： think,believe,make,find,consider,feel； 1 形式宾语it； 2 宾补的两种形式：形容词或名词； 3 真正宾语的三种形式：
an honour
…
… said It is / was p.p. known + that-clause believed
…
1. 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。
高三英语一轮复习课件 ：“it”的用法总结
考点一 it用作代词
1. 用作人称代词
（1）My friend offered me a beautiful gift, and I like it very much.（2）What will you call it if it’s a boy?（3）---Who is waiting for you at the bus stop? ---I have no idea. It may be my brother.
It was yesterday that I met Mary in the street.
it用于强调句
基本结构：It be + 被强调部分 +that /who +句子其他成分
I met Mary in the street yesterday.
1. It 无意义，不可换成this/that. 2. be 只用单数 is/was3. 被强调的部分不能为谓语动词. 4. 强调的部分是人 也可用who其它一律用that.
I
Mary
in the street
yesterday
It was I that/who met Mary in the street yesterday.
It was Mary that I met in the street yesterday.
It was in the street that I met Mary yesterday.
考点二：用作形式主语
It作形式主语时的几个常见句型: (1). It be + adj.+ (of / for sb.)+ to do sth.of 时此处 adj. 通常为描述人的属性的形容词: kind, unkind，nice ,rude，cruel，considerate，thoughtful，careful，careless等。 e.g. It's kind of you to help me with the problem.for时此处adj. 通常为描述事件的形容词：easy，difficult，hard，necessary，unnecessary，possible，impossible，likely，unlikely，right，legal，illegal，polite，impolite，clear，obvious，dangerous…e.g. It is illegal（for a teenager）to drive a car without a license.
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。
it的用法归纳高中
it的用法归纳高中高中阶段，“it”这个小小的单词，可是有着大大的用处！今天咱们就来好好归纳一下“it”在高中英语中的各种用法。
先来说说“it”作人称代词的时候。
这时候，“it”可以指代除人以外的一切事物或者动物。
比如说，“Look at the dog It is so cute”这里的“it”就是指代前面提到的“dog”。
“it”还能用来指代不明性别的婴儿或者身份不明的人。
想象一下，有人敲门，你不知道是谁，这时候你可能就会问：“Who is it?”再讲讲“it”作非人称代词的情况。
“It”可以表示天气、时间、距离、温度等等。
就像“It is sunny today”说的就是今天的天气晴朗。
“It's five o'clock”这就是在说时间是五点钟。
然后呢，“it”在高中英语中还有一个很重要的用法，那就是作形式主语或者形式宾语。
这个有点复杂，咱们慢慢说。
比如“It is important to learn English well”这里真正的主语是“to learn English well”，为了让句子看起来更平衡，就用“it”来作形式主语。
还有“It is ＋ adj ＋for/of sb to do sth”这个句型，同学们可得好好记住。
到底用“for”还是“of”，得看形容词是形容事情还是人。
如果是形容事情，就用“for”；要是形容人，那就用“of”。
比如说，“It is difficult for me to solve this problem” 这里“difficult”是形容“solve this problem”这件事，所以用“for”。
再看“It is kind of you to help me” 这里“kind”是形容“you”这个人，所以用“of”。
我想起之前教过的一个学生，他总是弄不清楚“it”作形式主语和宾语的用法。
有一次做作业，他错了好多相关的题目，那叫一个郁闷。
(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。
高中阶段It常用句型解析及运用
高中阶段It常用句型解析及运用一、It作形式主语1.It 代替不定式，常用于以下结构：It+ be+ adj./ n. +( for sb )to do sth;It+ be+ adj. +of sb to do sthIt takes +sb+一段时间+ to do①It is important for us to master a foreign language.对于我们来说，掌握一门外语是十分重要的。
②It is very kind of you to help me with my English.你帮我学英语，真是太好了。
③It will take about two days to drive to Shanghai.开车去上海大约要两天的时间。
2.It代替动名词，常用于以下句型中：It is no use doing sth. 做……没有用。
It is no good doing sth. 做……没好处It is fun doing sth. 做……有趣①It’s no use crying over spilt milk.覆水难收。
②It’s no good eating some fast food.吃快餐是没有好处的。
③It’s great fun jumping into the swimming pool in summer.夏天跳进游泳池里游泳是件有趣的事。
3.It代替that从句，常用于以下句型中：It be +adj./ n. +that从句It be +过去分词+ that 从句It seems / appears / happens / turns out that 从句It ourred to sb+ that从句①I don’t know the restaurant, but it’s said that it’s quite a good one.我不知道这家饭馆，但听说相当不错。
it句型归纳总结大全
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。
it用法总结(高三总复习)
It is two weeks since I saw him
• It’s + 时间段 +It'sstienncyeea.r自s be从for…e I g…rad有uat一ed.段时间了。 • It’s + 时间段It+'s tbeneyfoearres .th过at I多've 长lived的he时re f间or 才… it’s=it was • It‘s + 时间段It w+astthean ty.ea…rs a多go 久whe了n I graduated • It's + 时间段 + when ...是.在某个时刻
三、it用作形式主语
1. 基本用法 • 当不定式、动名词、从句等复杂成分用作句子主
语时，为保持句子平衡，通常把真正的主语放在 句末，而在句首使用形式主语it。如：
• It’s very important to remember this. 记住这
一点很重要。
• It’s hard work climbing mountains. 爬山是费劲
.
一、it 作人称代词的用法
• 1. 指事物 • 作为人称代词，it 可以除人以外的一切事
物或动物。如： • I dropped my watch and it broke. 我
把手表掉在地上摔坏了。 • It’s hard work, but I enjoy it. 工作很
(word完整版)it在高中阶段用法句型
It句型背诵一．It 做形式主语●to do 做真正的主语1. 我很方便和他取得联系。
It is convenient for me to get in touch with him.2. 你那样做是很愚蠢的。
It is stupid of you to do so.3. 我们听到那消息很惊讶。
It was amazing to us to hear the news4. 修长城花费了成千上万人很多年的时间。
It took thousands of people many years to build the Greatwall.●doing做真正主语5. 你和他理论是没有用的。
It is no use your arguing with him.6. 覆水难收It is no good crying over spilt milk.7. 雨天爬山真是有趣。
It is great fun climbing mountains on raining days.8这项工作值得做It is worthwhile doing the work.It is worthwhile to do the work.●that 做真正主语9. 他整天责备别人是不足为奇。
It is no wonder that he scolds others all day long.10. 据信他在国外学习/ 要去国外学习/ 去了国外学习。
It is believed that he is studying abroad / to go abroad for study/ has gone abroad for study. He is believed to be studying abroad/ to go abroad for study/ to have gone abroad for study.11. 我突然想起我忘了锁门。
it的用法总结经典句型
it的用法总结经典句型1. “It’s time to do something”（是做某事的时候了）。
比如说：“It’s time to hit the sack!（是该睡觉的时候啦！）”，这就像是火车到了站点，该行动啦！2. “It takes somebody some time to do something”（某人花费多少时间做某事）。
像“ It took her a whole day to finish that painting.（她花了一整天来完成那幅画。
）”，就好像爬山一样，得一步步花费力气上去呀。
3. “It seems that...”（似乎……）。
比如“ It seems that he is angry.（似乎他生气了。
）”，这就如同天空的云，好像是某种形状，但又不是那么确定。
4. “It is said that...”（据说……）。
像“ It is said that there is a monster in that lake.（据说那个湖里有个怪物。
）”，就好像是流传的神秘故事一样吸引人。
5. “Make it +形容词”（使它变得……）。
例如“Let’s make it interesting.（让我们使它变得有趣。
）”，是不是如同给一幅画上色，让它鲜活起来呢？6. “Find it +形容词to do something”（发现做某事是……的）。
像“ I find it difficult to learn this language.（我发现学习这门语言很难。
）”，这和走一条崎岖的路一样，能感受到其中的不容易啊。
我的观点结论：掌握这些关于 it 的经典句型就如同拥有了一把钥匙，可以打开英语表达的各种奇妙之门，让我们在英语的世界里更加自如地交流和表达呀！。
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。
it用法总结(高三总复习)
利用在线作业平台实现作业 的实时批改和反馈
利用虚拟现实技术进行模拟 考试和实验操作训练
利用信息技术促进学生自主学习的案例
利用在线学习平台如Khn cdemy、Courser等提供丰富的学习资源 让学生自主选择学习内容。
利用智能学习工具如Quizlet、nki等帮助学生进行复习和记忆。
利用社交媒体如Fcebook、Twitter等建立学习小组让学生互相交流 和学习。 利用虚拟现实技术如Google Expeditions、Oculus Rift等让学生 身临其境地体验学习内容。
优势：提高学 习效率节省时
间
局限性：过度 依赖可能导致 学习效果下降
合理利用：结 合传统学习方 法避免过度依
赖
注意事项：选 择合适的IT工 具避免习中的实际案例分 析
利用信息技术提高课堂效率的案例
利用多媒体技术进行教学如PPT、视频等使教学内容更加生动、直观。
利用网络资源进行学习如网络课程、在线题库等方便学生自主学习。
高三总复习中的IT 用法总结
单击此处添加副标题
汇报人：
目录
添加目录项标题 IT用法的常见类型 IT用法的优势和局限性 如何提升高三师生的IT用 法能力
IT用法的概念和重要性
IT用法在高三总复习中的 应用场景
IT用法在高三总复习中的 实际案例分析
01
添加章节标题
02
IT用法的概念和重 要性
什么是IT用法
组织信息技术竞 赛激发学生的学 习兴趣和积极性
提供实践机会让 学生在实际操作 中提高信息技术 能力
加强教师信息技 术培训提高教师 的信息技术教学 水平
加强学校的信息技术设施建设和维护
硬件设施：更新计算机、投影仪等设备确保其性能稳定 软件设施：安装最新版本的操作系统和教学软件提高教学效率 网络环境：优化校园网络提高网络速度和稳定性 培训和指导：定期组织教师进行信息技术培训提高其使用能力 维护和更新：定期对信息技术设施进行维护和更新确保其正常运行
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
个性化教案学科：高中英语课时计划：2 课时年级：高三课题：高中英语It用法总结归纳学生姓名：教师姓名：陈莉教学目标总结归纳并掌握高中英语It用法教学重点总结归纳并掌握运用高中英语It用法教学难点掌握运用高中英语It用法授课类型归纳总结课教学过程教师活动It用法总结归纳一、人称代词1，it的最基本用法是作代词，主要指刚提到的事物，以避免重复:①They watched the train until it disappeared in the distance.2.，也可以指动物或婴儿(未知性别的婴儿或孩子):②Is this your dog？No, it isn’t.③They got a baby and it was a ten-pounder3.，也可指抽象事物或指抽象环境和情景:③I hate it when people talk with a full mouth.．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 Beijing to Guangzhou.⑸.指价值:It is three dollars.⑹.指温度:Today it is 30 degrees centigrade.三、其他用法1.在句子的主语不太明确时充当主语，表示谁在做某事：①Who is it there? It's I (me/you/he.....).②I thought it was Mary, but it was not she.③Her face lighted when she saw who it was.2.泛泛的指某件事：(有时泛指一般情况)①It doesn’t matter.１②It is a shame, isn’t it?③How is it going?(情况怎样)④It 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。
)四、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 从句常译为＂┅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.⑵It is important ( necessary，right，strange，natural...) that 从句常译为┅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。
①It is important that we (should) learn English well.②It is necessary that he (should) remember these words.⑶It is said (reported/ learned/believed/thought/known/told/hoped.....) that 从句常译为＂据说（据报道，据悉．．．）＂。
①It is said that he has come to Beijing.②It is reported that another earth satellite has been put into orbit.⑷It is suggested ( advised/ ordered / demanded/ insisted/ commanded... ) that 从句.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．．．）①It is suggested that the meeting ( should ) be put off.②It was ordered that we ( should ) arrive there in two hours.⑸It is time ( about time ，high time ) that从句(虚拟语气:动词用过去时did)①It is time that children went to bed.②It is time you bought a new car.③It is (high ) time you made up your mind.⑹It is the first ( second ... ) time that从句(从句用现在完成时have done )It was the first ( second ... ) time that从句(从句用过去完成时had done )常译为＂是第一（二）．．．次．．．＂。
It is the first time I have been here. = This is the first time I have been here⑺It is a pity ( a shame /an honour/a good thing/a fact,/a surprise/... ) that从句.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。
①It 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！②It is a pity that he is ill. 他生病了，真遗憾！⑻It happens (seems，looks，appears ) that从句.常译为“ 碰巧…,似乎是…,看起来…”①It happened ( so happened ) that he met his teacher in the street. 碰巧．．.②It seems that he will be back in a few days. 看来．．．２2.作形式主语替代不定式.⑴It 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。
这个句型可以改写为：sb. is kind to do sth. 。
如:It is kind of you to say so. = You are kind to say so.⑵It 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。
常见的形容词有：important，necessary，natural easy ，safe ，common ，normal ，hard ，difficult ，dangerous ，unusual，rare ，impossible ，pleasant如:It is important for her to come to the party. = It is important that she (should ) come to the party.⑶It takes sb. ... to do sth. 常译为＂做．．．要花费某人．．．＂。
如:It took thousands of people many years to build the Great Wall.3.作形式主语替代动名词短语It is no good / no use / useless doing sth. 常译为“┅有好处或没有用”①It is no good learning English without speaking English.②It's useless trying to argue with Shylock.五、作形式宾语，代替不定式，动名词短语或宾语从句。
We think it important to learn a foreign language.该句型中的it 作形式宾语，该结构中常用的动词有：think, believe, make ,find consider, feel；如: We think it our duty to clean our classroom every day.He felt it important learning English well.They found it difficult that they would finish their work in two days.The Internet makes it easier for companies to keep in touch with customers.六、.it的重要句型1.强调句型: It is/was + 被强调部分+ that 从句(被强调的主语如果是人，that可以由who换用)①It was about 600 years ago that the first clock with a face and an hour hand was made.②It was they that (who ) cleaned the classroom yesterday.③It was in the street that I met her father.④It was yesterday that I met her in the street.⑤It is you that /who are wrong.特例:It is not until + 被强调部分+ that ... 该句型也是强调句型。