高中英语语法之it 形式主语
It作形式主语
It作形式主语和形式宾语，虽然是我们高中就学过的语法点，但在考研英语题型中，无论是在阅读还是翻译，常会考查该知识点。
一.it作形式主语。
英语中不定式、动名词、主语从句在作主语时主语往往显得很长，使整个句子看上去有点头重脚轻，这样就借助“it”来作形式上的主语，而把真正的主语移到句子后边去，使全句结构上前后平衡。
“it”并无实际意义。
It之后的谓语部分，可以是be+形容词，be+名词(词组)，或be+过去分词等。
it 作形式主语，主要分为下列三种情况：不定式作主语、动名词作主语和名词从句作主语。
具体分析如下：一、不定式作真正主语主要用于下列句型：1. It + is/was + adj./n.+ to do sth.A.名词作表语。
主要有a pity, a pleasure, an idea等。
It is a good idea to think this way. 这样考虑问题是个好办法除be外，其他动词也有跟名词的情况。
例如：It seems a pity to waste the food. 浪费这些食物真可惜。
B. 形容词或形容词短语作表语。
分两种情况：1.下列形容词；kind,good,nice,clever,wrong,right,foolish,wise,unwise,stupid,rude,careless,cruel,brave ,naughty,polite,selfish等词作表语时，不定式前常可加一个由of引起的短语，来说明不定式指的是谁的情况。
形容词表示不定式逻辑主语的特征，即形容词用来描述不定式行为者的性格、品行等。
例如：It was foolish of you to leave school.你中途退学，真是傻瓜。
2. 其他形容词作表语，常见的形容词有：necessary, hard，important, difficult, easy, possible，common等。
英语语法 it作形式主语或宾语
•The team is headed by a 44-year-old Mongolian, whose wife is a Tibetan. •The Tower of London, where so many people lost their lives, is now a tourist attraction.•She is going to spend the summer holidays in Qingdao, where she has some relatives.•They will fly to Kunming, where they plan to stay for two or three days, and then go on to Guilin.•She was very fond of speaking French, which indeed she spoke well.•They turned a deaf ear to our demands, which enraged all of us.•She married Joe, which surprised everyone.Which表示this或that时，也可用于in which case, at which point, on which occasion等说法：•I may have to work late, in which case I’ll telephone.•The speaker paused to examine his notes, at which point a loud crash was heard. •As was usual with her, she took a walk around here after supper.•The output, as is reported, has been doubled in the past three years.•I smiled broadly, as I always do in those situations.•He opposed the idea, as could be expected.•She was not unconscious, as could be judged from her eyes.限制性定语从句•The girl to whom I spoke is my cousin.•This is the man to whom I referred.•This is the question about which we’ve had so much discussion.•The tool with which he is working is called a wrench.•The agency from which we bought our tickets is bankrupt.限制性和非限制性定语从句的理解•My brother who is a doctor lives in New York.•My brother, who is a doctor, lives in New York.•My brother who is a doctor lives in New York.我有不止一个brother,其中当医生的那个在纽约工作。
It作形式主语和形式宾语用法详解
新希望英语语法精讲—“It”作形式主语和形式宾语“It”作形式主语和形式宾语的用法详解It作形式主语和形式宾语用法，是英语学习的主要语法项目之一。
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在特殊句型中作形式主语和形式宾语用法，进行如下归纳分析，以供学习参考。
一、It用作形式主语当不定式（短语）、动名词（短语）或从句在某个句子中作主语时，为保持句子结构前后平衡，避免头重脚轻，因此常用it作形式主语置于句首，而将真正的主语放在句尾。
此时it只起先行引导作用，本身无词义。
e.g. It is wrong to tell a lie.（说谎是错误的。
）［It 为to tell a lie 的形式主语〕It is no use arguing about it.（争吵是没用的。
）〔It 为arguing about it 的形式主语〕It is uncertain who will come.（谁要来还不确定。
）〔It 为who will come 的形式主语〕It作形式主语的常见句型：① It + be + 形容词+ to do sth. / doing /that ….e.g. It is very important to learn a foreign language. （学一门外语非常重要。
）It is useless crying over the spilt milk. （覆水难收。
）It was really surprising that she married a man like that.（她嫁给那样的男士真让人惊讶。
）②It + 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。
英语语法it的句型
英语语法it的句型下面是小编为大家整理分享的英语语法it的句型，快来看看吧。
四、It 作形式主语的常见句型：1. 替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 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/ann oy/amaze/bother/concern/frighten/please/anger sb. that (I)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(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.)(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.下载文档润稿写作咨询润稿写作咨询。
“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 bｅadj．(fｏr ｓb.)ｔo dｏｓth．此处adj. 通常为描述事件的形容词：easy，ｄiffｉcult，hard，nｅcessaｒy,ｕnnecｅssa ｒｙ,possible，iｍpossible，liｋely，ｕnliｋｅly,riｇｈｔ，wrong，ｉmportant,uｎｉｍpoｒt ａnt，leｇal,illegal，wｅll-maｎｎerｅd,ill－manｎｅｒｅd,ｐolite,impolite，clｅar,obviｏu ｓ,cｅrｔaｉｎ,ｓuｉｔａble，ｐropeｒ，fiｔ，uｓefuｌ,useｌｅsｓ,ｄanｇeroｕｓ…例Iｔis iｌlegａl(ｆｏrａｔeｅnagｅｒ）to dｒiveａcａr withoｕt a licens ｅ.(2）It be adｊ．oｆsb. toｄo 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＇ｓkiｎdｏf yｏｕto help me wiｔｈｔhe proｂlｅm.（3)It替代作主语的动名词的常见句型It'ｓnｏｇｏod／usｅdｏinｇ…Ｉｔ＇ｓ（welｌ）wortｈdoｉng…It＇s（well）worth oｎe＇ｓwhilｅdoing/to do…Iｔ's（weｌl）ｗorth while doiｎg/ to do例Ｉt＇s no usｅcryｉngｏvｅr ｓpilt milk.2. Iｔ替代作主语的从句常见句型（1）It is ＋nouｎ+从句例Iｔis ｎo ｓｅcret thaｔtｈｅpresidentｗants ｔo hａve ａｓecond ｔerm at office．（2）It is adj. +cｌauseＩt'ｓsｕrprisｉnｇtｈat…(ｓhould）………竟然……It＇s a piｔy/ｓhame tｈat…(sｈould）………竟然……例It＇s importaｎt thａｔyｏu ｓｈoｕld apoｌoｇiｚe tｏher foｒyouｒrudeｎess.(=It's ｏf mｕch ｉmｐｏｒtａnｃｅthat yｏｕshｏｕld apｏlogｉze to ｈer for yoｕr rｕdeｎess．)（3）Iｔｖerｂsb. + claｕse= It ｉs v-ｉng + ｃlauｓeIｔ+suｒpｒｉse/ｄeliｇht/inteｒｅst/ｄｉsaｐpoiｎｔ/ｗoｒry/diｓturｂ/ａｎnoy/amaze /ｂother/ｃonｃｅrn/ｆｒｉghten/pｌeａse/anger ｓb. ｔhat…例Iｔwｏrried mｅthaｔshe ｄroｖe ｓｏfast.(＝Iｔｗas wｏrｒｙing that ｓhe dｒovｅso fasｔ.）（4）Iｔverb（ｔo sｂ.)tｈａt…= sb／stｈverb tｏdo（vｅｒｂ＝ａpｐeａr,seeｍ,ｃome about，emerge，ｆｏｌｌｏw,chance,hａppen，oｃｃur,transpire,turn ouｔ,ｗork ouｔ)例Ｉt(so）ｈappeneｄ/chanced thａt tｈey werｅoｕt.(＝Tｈｅｙhapｐened/c ｈanceｄto ｂe ｏut.）（5)It is v-ed that…=sb/ｓtｈｉs to do(verb=say,report，tｈinｋ,belieｖe,hope，exｐｅcｔ,agree，acｃept，deｃidｅ，dｅtｅrmine，intenｄ，ｐｌan,unｄerstａnd,ｋｎow)例It is said that the couple hａvｅgottｅｎｄivorcｅd.(＝Thｅcｏupｌe aｒe said to have goｔten ｄivorced.）（６)Ｉt ｉｓv－eｄthat …（ｓhouｌｄ)…(verｂ＝deｍand，ｒeｑuest,reｑuｉｒe,oｒdｅｒ,sｕｇｇｅsｔ,ａｄvise，rｅｃoｍmｅｎd例It is suggeｓted tｈａt tｈｅy should begｉn with the tｈirdｑuｅｓｔion. “It”用法及其句型和固定搭配讲解2007-0５-０１17:１4：０5.０中国高中生网()三、Ｉt作主语的句型1．It tａkｅs sb.…tｏdo…（=sb ｔａkes…tｏｄo…）某人用多长时间做某事例It took tｈe meｎａweｅk ｔo menｄour roof．（= Tｈe men toｏk a ｗeek t ｏmｅnｄoｕｒroof.）2. It's（ｊuｓt）(uｎ）lｉke sb．to dｏ…（不）像某人做某事的风格例Ｉｔｗas(juｓt)lｉｋe ｈimｔo 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)tｉmｅthat we shouｌｄtａke ａｃtｉon.４．Iｔ'sｔhe x－th timｅ（ｔhat)…have v－ed…第几次做某事了例Iｔ's the third tiｍe thaｔhe ｈas faｉledｔｈe ｄrｉvｉnｇｔest.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例It＇s 10 yｅars tｈａt he lｉveｄheｒe６.It ｗas(noｔ）…befoｒe…过(不)了多长时间某动作发生了例It was noｔlong 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考点讲义：it用作形式主语和形式宾语的用法归纳总结- 高考英语语法二轮复习专题.docx
高中英语语法高考二轮复习it考点讲义【精讲版】it用作形式主语和形式宾语的用法归纳总结一、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厄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il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 il 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。
高中英语知识点归纳形式主语和真正主语的用法区别
高中英语知识点归纳形式主语和真正主语的用法区别形式主语和真正主语在句子中起着不同的作用，它们的使用方法也存在一些区别。
了解形式主语和真正主语的用法区别，可以帮助我们更好地理解和运用英语语法。
本文将详细介绍这两种主语的区别及其使用方法。
一、形式主语的定义和用法形式主语是英语句子中的一个特殊结构，一般由"it"作为形式主语，而真正的主语通常位于句子后面。
用形式主语可以使句子结构更为简洁，突出真正的主语或具体的动作。
下面是几个形式主语的典型应用场景：1. 天气描述：It is raining. (下雨了。
)形式主语"it"用于表示天气状况，并将真正主语"raining"后置。
2. 环境描述：It is sunny today. (今天阳光明媚。
)形式主语"it"用于描述一种环境状态，真正主语"today"被放在句末。
3. 存在句：It is a lovely cat. (这是一只可爱的猫。
)形式主语"it"用于指代前面的主语"a lovely cat"，以使句子结构更加自然。
4. 距离表达：It is two miles away. (距离这里有两英里。
)形式主语"it"用于介词短语中表示距离，真正主语"two miles"位于动词"be"之后。
二、真正主语的定义和用法真正主语指的是句子中进行动作或存在的对象，它在句子中的位置往往较为灵活，可以位于句首、句中或句末。
下面是几个真正主语的常见用法：1. 人称主语：Tom is a student. (汤姆是一个学生。
)真正主语"Tom"作为人的称谓，出现在句首，是一个常见的用法。
2. 名词短语主语：My sister likes to read books. (我的妹妹喜欢读书。
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。
英语语法：it用作形式主语的用法
英语语法：it用作形式主语的用法it用作形式主语的用法一、基本用法当不定式、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：Is it necessary to tell his father everything? 有必要把这个切都告诉他父亲吗?It’s no good sitting up too late. 熬夜没有好处。
It is quite clear that he has read the book. 很显然，他读过这本书。
It doesn’t matter what he says. 他说什么没关系。
二、几种特殊的形式主语(1) 用作动词look, seem, appear, happen, occur, follow等的主语(后接that从句或as if从句)：It seems as if it is going to rain. 看来要下雨了。
It seems that he knows everything. 他好像什么都知道。
It (so) happened that I had no money with me. 碰巧我没带钱。
From this witness it follows that he must be guilty. 根据该证人的证词判断，他一定有罪。
(2) 当系表结构后接有if 或when引出的状语从句时，通常在系表结构前使用形式主语表示说话人对某情况的看法：It was a great surprise to me when he did a thing like that. 他这样做使我很吃惊。
It would be a tragedy if anything went wrong. 如果出了什么事就是一个悲剧。
(3) 用于其他固定句型，如if it were not for…(若不是因为)，it’s time that…(该…了)等。
英语语法：形式主语it构成的主语从句
【导语】有时为了考虑句⼦平衡，通常在主语从句处使⽤形式主语it，⽽将真正的主语从句移⾄句末。
整理了相关内容，快来看看吧！希望能帮助到你~更多相关讯息请关注！(1) 对于以连词that引导的主语从句，通常⽤形式主语代主语从句：It is important that he should know about this. 他必须知道此事。
It’s vital that we be present. 我们出席是⾄关重要的。
It was intended that you be the candidate. ⼤家的意图是让你当候选⼈。
It is important that this mission not fail. 这项使命不失败⾄关重要。
It is essential that a meeting be convened this week. 本周开⼀次会⾮常重要。
It is appropriate that this tax be abolished. 废除这个税是恰当的。
It’s unfair that so many people should lose their jobs. 竟有这么多⼈失业这是不公平的。
It’s amazing that she should have said nothing about it. 她竟未谈及此事令⼈惊讶。
It’s unthinkable that they should deny my request. 他们竟然拒绝我的请求，这是不可思议的。
(2) 对于以连接代词(副词)引导的主语从句，可以使⽤形式主语代主语从句，也可直接在句⾸使⽤主语从句：It was a problem whether they would support us. 他们是否会⽀持我们还是⼀个问题。
It remains to be seen whether it will do us harm or good. 它对我们是利是害，还得看看再说。
it做形式主语动名词做真主语造句
在学习英语句子结构的过程中，我们经常会遇到形式主语和真主语的概念。
其中，it做形式主语、动名词做真主语的句子结构是比较常见的一种。
本文将通过深入探讨这种句子结构的特点、用法以及举例，帮助读者更好地掌握其使用方法。
2. it做形式主语、动名词做真主语的句子结构特点在英语中，it做形式主语、动名词做真主语的句子结构常常用来表达一些抽象或概念性的动作或状态。
这种结构的特点是，it作为形式主语，起到引出主语的作用，而动名词则真正承担了句子的主语地位，表达了动作的具体内容。
例如：- It is important to keep a positive attitude.（保持积极的态度很重要。
）- It takes time to build trust.（建立信任需要时间。
）3. 用法it做形式主语、动名词做真主语的句子结构在英语中常用于表达一些普遍性的真理、规律或道理。
它可以使句子更加简洁明了，突出动作或状态的重要性。
这种结构也常常用于表达某种动作或状态的主观性认知。
在写作或口语表达中，我们可以灵活运用这种句子结构，使语言更加地道和自然。
- It is essential to have a clear goal in mind before starting anew project.（开始一个新项目之前，心中必须有一个明确的目标是至关重要的。
）- It feels amazing to achieve something you've been working hard for.（实现自己努力追求的目标感觉真是太棒了。
）5. 总结和回顾通过本文的探讨，我们对it做形式主语、动名词做真主语的句子结构有了更深入的了解。
这种结构的灵活运用可以使我们的英语表达更加地道和生动。
在学习和使用英语的过程中，我们需要多加练习，灵活应用这种句子结构，从而提高自己的语言表达能力。
6. 个人观点和理解在我看来，it做形式主语、动名词做真主语的句子结构是英语语法中的一种亮点。
it作形式主语和宾语的几种结构
B. 动词+ it + that从句。常见于like, take, have, put等少数动词之后（it相当于that从句的同位语）。
I take it that they will succeed sooner or later.
我认为他们迟早会成功的。
The newspapers have it that some Japanese firms have gone bankrupt.
（他们发现与我们中国人一起工作很愉快。）
I don’t feel it difficult to understand the Special English.
（我觉得理解英语特别节目并不难。）
He makes it a rule never to borrow money.
（他立志决不向别人借钱。）
(我花了一些时间才读完那段阅读材料。)
It took him fourteen hours to go to New Zealand from Shanghai by plane.
(从上海乘飞机去新西兰花了他14小时。)
How long does it take you to go to Beijing from Qingdao by train?
(据说他们发明了一种新型电脑。)
It is believed that China will become one of the strongest countries in the world.
(大家都相信中国将会步入世界强国之列。)
It was reported that more than 170 thousand people died in the 2004 tsunami.
It做形式主语句型整理大全
It做形式主语句型整理大全It 做形式主语句型整理大全形式主语句型是英语语法中常见的一种句型结构，其中“it”作为句子的形式主语，代替真正的主语，使得句子结构更加简洁和清晰。
本文将介绍常见的形式主语句型，并给出相应的例句说明。
1. It + be + 形容词 + (for/of somebody) + to do something这种句型用来描述某事或某物对某人具有某种特定属性或特征，强调主观情感或感受。
其中的“for/of somebody”是可选的，用来表示某人对这种特征的感受或看法。
例句：- It is important for us to take care of the environment.- It is easy to learn a new language if you practice every day.- It is common for teenagers to experience mood swings.2. It + be + 名词 + (for somebody) + to do something这种句型用来描述某事或某物对某人来说是合适或适当的。
例句：- It is a good idea for you to start exercising regularly.- It is essential for a student to manage their time effectively.- It is necessary for parents to spend quality time with their children.3. It + be + 形容词 + that + 句子这种句型用来描述某事或某物具有某种特定属性或特征，强调客观事实和真实性。
例句：- It is interesting that she decided to travel alone.- It is evident that the company is facing financial difficulties.- It is amazing that they managed to finish the project ahead of schedule.4. It + be + 名词 + that + 句子这种句型用来描述某人对某种情况或事实所持的看法、判断或观点。
it做形式主语动名词做真主语造句
it做形式主语动名词做真主语造句标题：深度解析：IT做形式主语，动名词做真主语的句子结构在语法学中，形式主语和真主语是一种特殊的句子结构，它们在英语中经常出现。
而当形式主语由IT代替，并且真主语由动名词构成时，这种句子结构显得更加复杂和有趣。
本文将深度探讨IT做形式主语，动名词做真主语的句子结构，让我们一起来领略其中的深度和广度。
一、简介IT做形式主语，动名词做真主语的句子结构，是英语句子中的一种特殊句型。
在这种句子结构中，IT作为形式主语，而动名词则充当真正的主语。
这种结构的使用，往往能够使句子更加简洁明了，也更有文采。
下面我将通过一些例句来解释这种句子结构的使用方法。
二、例句分析1. It is important to keep a positive attitude in life.这个句子中，IT是形式主语，而动名词is important是真正的主语。
这种结构的使用能够让句子更加直接地表达主题，同时也增加了语气的权威性。
2. It takes time to build trust with others.在这个句子中，IT依然是形式主语，而动名词takes time是真正的主语。
这种结构的使用让句子更加生动有趣，同时也强调了动作的持续性和重要性。
三、个人观点在我看来，IT做形式主语，动名词做真主语的句子结构，不仅丰富了英语句子的表达方式，同时也让句子更加生动有趣。
这种结构的使用，不仅让句子更具有逻辑性和清晰度，同时也增加了句子的语气和表现力。
在写作时，我们可以尝试使用这种结构，来让句子更加抓人眼球，同时也让语言更加优美动人。
总结通过本文的深度探讨，我们对IT做形式主语，动名词做真主语的句子结构有了更加全面、深刻和灵活的理解。
这种句子结构的使用，不仅可以让句子更加简洁明了，同时也增加了句子的语气和表现力。
希望本文的内容能够对你有所启发，并让你在写作时更加游刃有余。
形式主语和真主语作为句子结构的重要组成部分，在英语中具有很高的使用频率和广泛的应用。
英语语法：形式主语it构成的主语从句
英语语法：形式主语it构成的主语从句(1) 对于以连词that引导的主语从句，通常用形式主语代主语从句：It is important that he should know about this. 他必须知道此事。
It’s vital that we be present. 我们出席是至关重要的。
It was intended that you be the candidate. 大家的意图是让你当候选人。
It is important that this mission not fail. 这项使命不失败至关重要。
It is essential that a meeting be convened this week. 本周开一次会非常重要。
It is appropriate that this tax be abolished. 废除这个税是恰当的。
It’s unfair that so many people should lose their jobs. 竟有这么多人失业这是不公平的。
It’s amazing that she should have said nothing about it. 她竟未谈及此事令人惊讶。
It’s unthinkable that they should deny my request. 他们竟然拒绝我的请求，这是不可思议的。
(2) 对于以连接代词(副词)引导的主语从句，能够使用形式主语代主语从句，也可直接在句首使用主语从句：It was a problem whether they would support us. 他们是否会支持我们还是一个问题。
It remains to be seen whether it will do us harm or good. 它对我们是利是害，还得看看再说。
(3) 对关系代词型what引导的主语从句，通常直接将主语从句放在句首。
高考英语临考冲刺 语法讲解 it用作形式主语代替动名词主要用于哪些句式
高考英语临考冲刺语法讲解 it用作形式主语代替动名词主要用于哪些句式it用作形式主语代替动名词的用法主要见于以下句式：1. It is no use (no good, fun, great fun, a new experience, a great honour, etc) doing sth。
如：It is no good talking. 空谈是没有用的。
It’s fun working for him. 为他工作很有意思。
It’s great fun sailing a boat. 扬帆驾舟十分有趣。
It’s no use shouting at him—he’s deaf. 向他叫喊是没有用的——他耳聋。
It has been a great honour your coming to visit us. 你来看望我们是极大荣幸。
2. It is good (nice, useless, interesting, pleasant, tiring, etc) doing sth。
如：It is useless speaking. 光说没有用。
It was pleasant sitting there. 坐在那里很愉快。
It’s so nice sitting here with you. 和你坐在一起真是愉快。
It’s good hearing English spoken. 听到人讲英语，我很高兴。
It’s terribly tiring working late like this. 这样干到深夜是非常累人的。
3. it is worth while doing sth。
如：It’s worth while doing the work. 这项工作值得做。
Do you think it’s worth while quarrelling with me? 你认为和我吵值得吗?4. 其他句式。
英语语法解析 it作形式主语
英语语法解析it作形式主语There are four levels of reading. They're here called levels rather than kinds because kinds, strictly speaking, are distinct from one another, whereas it is characteristic of levels that higher ones include lower ones. So it is with the levels of reading which are cumulative.【翻译】阅读总共有四个层次。
这里把它们叫做层次，而不是种类，是因为种类是相互各不相同的东西，而层次的特点则是高层次的东西包含低层次的东西。
这对阅读的层次也适用，它是累积的。
【语法分析】第一句是一个简单句，there be 句型。
第二句是一个主从复合句。
Because之前是主句，because引导的是原因状语从句。
原因状语从句是一个并列句，两个分句是由并列连词whereas连接起来的，是转折关系。
在第一个分句中，包含一个插入语，strictly speaking，作状语。
如果觉得不好理解，可以先把它放在一边，就成了kinds are distinct from one another，这样理解负担一下子减轻了。
第二个分句中，It是形式主语，真正的主语是后面的that从句。
be characteristic of是一个形容词短语，意思是“具有 ......的特点”。
此句中出现了两个ones，是复数代词，代替的是前面的名词levels.第三句也是一个主从复合句，其中which are cumulative是一个定语从句，修饰levels of reading.在主句里用了一个句型，so it is with...，意思是“......的情况也一样，......也如此”。
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It was suggested that the sports meet be put off until next Saturday. It is desired that we (should) get everything ready by tonight. It was ordered that the medicine be sent there by plane.
3）It is a pity (a shame, no wonder, better) that .... It is a pity that we didn't grasp that opportunity. It was a great pity that you (should) have made so many mistakes in your math exercise. It will be better that she stay with her grandmother.
it is very important that 7.好像他过几天就会回来。it sis a pity
that 9.大家都知道，要学好英语一定要多读多听多做练习。
it is well known that 10.那是我第一次到北京。it was the first time that 11.该是我们行动起来保护环境的时候了。it is high time
2）It is +v-ed +that 从句
It is said that Andy Lau will come to Guangzhou tomorrow.
It was reported that there were 300 people died of this disease.
It is known that Changjiang River is the second longest river in the world.
2) It is +v-ed +that 从句 ① It is said (reported， learned....) that ... ②. It is suggested ( ordered /demanded/insisted/commanded... ) that(should + v.原形) 3) It is a pity ( a shame ... ) that ... that后的从句一般用虚拟语气（should + 动词原形） 4) It happens (seems， looks， appears ) that... 5).① It is time ( about time ，high time ) that ... 虚拟 语气
It happens (seems， looks， appears ) that...
It happened ( so happened ) that he met his teacher in the street. It happened that her parents were both out. It happened that the harvest was bad that year. It happened that I had driven that kind of car before. It happened that I was standing next to him when he collapsed. It seems that she is very sad.
It is the first ( second ... ) time that ...
1）It is + adj. +that从句
① It is clear ( obvious， true， possible certain....) that .....
②. It is important ( necessary， right， strange， natural...) that ... 从句中要用虚拟语气（should + v.原 形）
1.It is important that students today master English. 2.It is perfect that you can come to my birhtday party. 3.It is obvious that we need more practice.
4.It is strange that he (should) have made a mistake. 5.It is natural that he fall in love with such a beautiful girl. 6.It's strange that he feel so angry.
1) It is + adj. +that从句
① It is clear ( obvious， true， possible certain....) that .....
②. It is important ( necessary， right， strange， natural...) that ... 从句中要用虚拟语气（should + v.原形）
It 作形式主语替代that从句 1）It is + adj. +that从句 2）It is +v-ed +that 从句 3）It is a pity ( a shame ... ) that ... 4）It happens (seems， looks， appears ) that... 5）It is time ( about time ，high time ) that ...
② It is the first ( second ... ) time that (完成时)
1.真可惜，他没来。it is a pity that 2.我们爱自己的父母是很自然的。it is natural that 3.很明显，他是是个勤奋又上进的人。it is obvious that 4.我恰巧在书店里碰到他。it happened that 5.人人都建议他提前预习考试的内容，但是他不听，难 怪他不及格。it was suggested \no wonder that 6.掌握好英语和计算机技术对于现代人来说是很重要的。