IT的意思是什么？

it用法完全归纳

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 工作很辛苦，可是我乐意干。

“Where is the dog”“It’s in the bedroom ” “狗在哪”“在卧室里”。

2 指人

it 指人主要用于指不性别不明的婴儿或用于确认某人的身份。如：

Is it a boy or a girl 是男孩还是女孩

There is a knock on the door It must be the postman 有人在敲门，一定是邮递员。

说明在答语中，常用来指本人，如说 It’s me。

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, nothing等。如：

“What’s this”“It’s a new machine ” “这是什么”“是一种新机器”。

Nothing is wrong, is it 没出什么问题，是吗

二、it 作非人称代词的用法

1 基本用法

it 作非人称代词的用法，主要用于指时间、距离、价值、天气、气候及温度等自然现象。如：

It’s too late to go there now 现在去那儿已经太迟了。

It rained all day yesterday 昨天下了一天的雨。

It can get very hot here 这里有时会很热。

2 用于某些句型

It’s time for sth 该做某事了。

It’s time to do sth 该做某事的时候了。

It’s time for sb to do sth 某人该干某事了。

It’s (about / high) time + that-从句 某人该做某事了。(从句谓语用过去式，有时也用“should+动词原形”)

It’s first (second) time + that-从句 某人第几次干某事。(从句谓语用现在完成时)

It’s + 时间段 + since-从句 自从……有一段时间了。

It’s + 时间段 + before-从句 过多长的时间才……

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 爬山是费劲的事。

It’s unknown when he will come 他什么时候来还不知道。

2 用作形式主语的的重要句型

(1) It + be + adj for (of) sb to do sth 某人做某事……

It is hard for him to make up his mind 他很难下定决心。

It was foolish of her to say such a thing 她说那样的话，真是太蠢了。

说明介词 of 与 for 的区别是：of 用于指某人的性格、属性、特征等，介词for表示对象，意为“对……来说”

(2) It takes sb + 时间段 + to do sth 某人做某事花了……时间

It takes years to master a new language 要花多年的时间才能掌握一门新的语言。

说明此句型可以有以下多变种变体：It took me an hour to write the letter =The letter took me an hour (to write) =I took an hour to write the letter 我写这封信花了一个小时。

It 用法大全

一、指无生命、动物、植物和在性别不计或不详时指人和婴儿。There is a person knocking at the door Who can it be

二、指心目中的人或上文中提到的人或事物，这那它 He is fifty-two, but doesn't look it

Jim is ill Have you heard of it

三、可以代替指示代词this和that

What's this/that？ ------It's a book。

四、作无人称代词的主语，表时间、天气、距离、温度、环境和情况。It was noisy when I got to the room

五--表含糊概念，无补语，指从句叙述内容。

I hate it that I've made so many mistakes

I hate it when you can't discuss things openly

You may depend on it they are valuable

How's it going with you 近况如何？

Does it itch much 很痒痒吗？

Where does it hurt 哪儿疼？

Now you are in for it 现在你可以到家了。

It says in the Bible, "Thou shalt not steal" 《圣经》上说："勿偷窃。" Hang it all, we can't wait all day for him见鬼，我们不能整天等他呀！ There is nothing else for it but to stand 别无他法，只好忍受。Whose turn is it next 接下来轮到谁了You never had it so good 日子从来没有这样好。Take it easy 放松点！不要紧张！

How is it in the market 超市情况如何？

六----强调句中使用"It is/was+强调部分 （主语，宾语等）+that/who+其余部分"。如果强调的是特殊疑问句，表示"究竟，到底"等语气时，就用结构："疑问词+is/was it that +句子"，如：Where was it that you met him What is it that he wants to see When was it that you saw him

Why is it that you want to change your idea

这类强调句也可用作表语或宾语。The question is which book it is that you want to buy

He found out who it was that saved the drowning boy

如果强调谓语，谓语动词部分的语气用do，does，did，常译作"的确，千万，真的"

Do be patient! 千万要耐心！He does speak English well。He said he would come and did come

七、作形式宾语

a) 谓语动词appreciate, dislike, like, hate, love, make (按时到达，成功)等后接由if或when 等引导的宾语从句时，往往在前面加上形式宾语it。 I would appreciate it if you could come to my birthday party

2、动词have（表明，坚持说）、take（认为，猜想）、hide（隐藏）、publish（公布）、put（表达，写出来）等后接由that引导的宾语从句时，往往在从句的前面加上形式宾语。I take it that you will be leaving Shanghai soon我认为你不久就离开上海。

We published it that we had finished the project ahead of time 我宣布我们已经提前完成了这项工程。

3、 动词短语allow for（担保）、count on（期待）、depend on（依靠）、insist on（坚持）、see to（确保）等后接that引导的宾语从句时，必须冠以形式宾语it。 如：I am counting on it that you will come 我们期待着你的到来。

She'll see to it that he goes ahead。 她确保让他先走。

八、 作形式主语-it作形式主语，真正的主语可以是to do，doing 和clause等

It 做形式主语，真正的主语是动名词，这类结构是it be + adjective/noun + doing, 这类词有nice, good, useless, hard, foolish, enjoyable, worthwhile, 和名词use, good, fun, job, a waste of 等。如：It is no use trying to argue with Shylock

It 作形式主语时，常用于下列四种结构，且由固定译法

a) it + be + noun + that-clause

it is a fact that…事实上是……

it is common knowledge that众所周知的是……

it is a question that………是个问题

it is a pity that…可惜的是……

it is a wonder that………真是个奇迹

it is a shame that…可耻的是……

it is an honor that…非常荣幸……

it is a common saying that…俗话说……

it is no good that………是没用的

it is no use that… 做……是无用的

it is one's turn to do 轮到……做……

it is one's duty to do 做……是……的职责

it is one's fault to do 做……是……的过错

it is worth that 可以看出…；可以说……；

it is no wonder that…难怪……

it is no good that做……是没用的

it is no harm that做…是无害的，无妨是…

I think it would be a good idea to do 我认为做……是个好主意

it is a great joy/pleasure to do 高兴做……

it is a shame to do 做……不光彩

it is good manners to do 做……是有礼貌的

it is a waste of time to do…做……是浪费时间

b) it + be + adjective + that-clause

it is certain that…很肯定的是 ……

it is clear/evident that…很清楚……

it is unlikely that…未必会，不见得，不太可能

it is likely that…很可能……

it is better that…最好……

it is natural that…很自然……

it is necessary that有必要……

it is obvious that … 很明显……

it is important that重要的是……，……是重要的

it is impossible that………是不可能的

c) it + be + past participle + that-clause

it is said/reported that…据说/报道……

it is demanded that…按要求……

it is estimated that…据统计……

it is believed that… 据认为……；人们认为……

it can be said that…可以说……

it can be seen that …可见……，可以说……

it has been proved that…已经证明……

it has been shown that…业已表明……

it must be pointed that…必须指出……

it must be admitted that 必须指出/承认，

it must be realized that 必须意识到

it is acknowledged that 应该承认……

it is announced that…据称……，有人宣称……

it is observed that… 值得注意的是……

it is arranged that…已经商定……

it is pointed out that…有人指出……

it is proposed that 有人提议…，一般认为……

it is regarded/thought that 人们认为……

it is considered that 人们认为…，据估计……

it is declared that…据宣称……，有人宣布

it is described that… 据说……，

it is expected that…人们希望……，预期……

it is generally accepted that通常人们认为……

it is believed/recognized that 普遍认为……

it is hoped that…人们希望……

it should be noted that 应该注意/指出。。。；it used to be said that 常言道……

it was noted above that 如上所述……

it will be said that 有人会说……

it will be seen from that 由此可见……

it is stated that据称；据说；有人说；一般认为

it is suggested that 有人提议；据建议

it is supposed that 据推测；假定；人们猜测

it is usually considered that 通常认为

it is well known that 大家都知道，众所周知

it is not settled whether 是否……还未决定

d) it + be + intransitive verb + that-clause

it seems that/as if 好像是……

it happens/happened that 碰巧……

it follows that 由此可见……

it matters that 要紧的是……

it occurs/occurred to sb that 某人想到……

it struck me that 我突然想到……

it appears to …that 在……看来似乎

it doesn't matter if/whether 即使……也无妨

it goes without saying that ……不言而喻

it is not until … that…直到……才……

it is up to somebody to do 该……做……

it remains to be proved that 尚待证明

it remains to be seen that 尚待分晓

it remains for sb to do 有待某人做……

it so fell out that 结果是，终于

it turned out that证明是，结果是

it is worth notice that 值得注意的是

it looks as if 看起来好像，似乎

it makes no difference that…都是一样，无区别

it is not just like sb to do 某人不会做……

it takes somebody something to do 某人花费……做……

九、习惯用法

it all depends=that depends 视情况而定

if it is convenient to you 如果你方面的话

believe it or not 信不信由你

take it easy 别着急，慢慢来，别紧张， as it is 但是实际上，其实

see (to it ) that 设法使，务必做到

what become of somebody/something 是……的结局，发生于

if it had not been for 若不是=but for

after what seemed +时间

it was not long before 不久就

cab it 乘车 brave it out 拼命干到底

walk it 步行 do/go it alone单q匹马的干

beat it =go away 滚

make it =succeed in doing 办成功

come it 尽自己的分内事come it strong 做的过分lord it over 欺压take it out of sb 拿某人出气have it out with sb 和某人讲个明白be hard put to it 在艰难之中

You're it 你下一个（用于儿童游戏中）

Is that it = Is that all you wanted me for 你要的就是这些吗？

十、 It's + adj + for/of somebody to do sth选择of 还是for，要根据形容词来决定，如果表示人的内在品质，后面引出的名词既是前面形容词的主语，也是动词不定式的逻辑主语，那么用of, 这类形容词有kind, brave, merciful, fine, cruel, selfish, stupid, clever, wise, unfair等；如果表示难易程度，可能性，等外在的特征，而且所引出的词只作后面动词不定式的主语，这类形容词有easy, difficult, hard, impossible, possible, convenient 等等。比如：

It is easy for you to make it

It is impossible for him to walk 30 miles within one minute

It is very kind of you to help me

It is wise of you to take his advice

十一、it 引起的容易混淆的时间句型

1、 it is/has been +段时间+since-clause 这个句型表示从since谓语动作发生以后到现在或过去所经过的一段时间，意思为："自从……以来已经多久了"，主句多采用一般现在时，从句用过去时，如果表示过去的情况，since 主句用一般过去时，从句用过去完成时，或主句用过去完成时，从句用一般过去时。要注意：since引导时间状语从句时，从句若使用终止性动词，则表示该时间是从现在算起的；若使用延续性的动词，则表示时间是从过去算起的。如：

It's five years since they got married（从现在算起） It's five years since they were married (从过去算起)

It is three years since his father passed away

2、 it be +段时间+before-clause ---这个句型中的时间是段时间（long years, months, weeks, days, hours, minutes）,主句中的谓语动词用肯定式，意思为："过多长时间才……"。主句谓语动词是否定式时，意思为："没过多长时间就……"。主句的时态可用过去时was或将来时will be，用was时，before从句的时态用一般过去时，用will be时，从句常用一般现在时。如

It was not long before he learned those poems by heart她没过多久就会背那些诗了。

It was long before the police arrived

It will be hours before he makes a decision

It will not be hours before we meet again

3、 it be +点时间+when-clause这个句型中，it指时间，而且表示时间的词语前没有介词，时间为具体时间。主句中的谓语部分和从句中的谓语动词在时态上一般是一致的，主句是will be时，从句中用一般现在时替换将来时。如：It was already 8 o'clock we got there

It will be late afternoon when they get there

it be +时间+that-clause 此句型为强调句型

4、 it be +high/about 时间+that-clause 此句型是个虚拟语气句型，表示是该做……的时候了，此时无论主句中的be是什么时态，从句中的谓语动词一律用一般过去时或者should do，high和about是用以加强语气的。如：It is high time that we he went to school

It is time that we should make people's life a little better

6、It/This/That be the first(second/third…) time that-clause这个句型表示说话时为止某人的一种经历，关键是time前面的序数词，主句是is时，从句要用现在完成时，主句是一般过去时，从句要用过去完成时。

This is the first time (that) these Europeans have visited the Great Wall

It was the fifth time (that) I had paid a friendly visit to America

十二、下面的句型中用there而不用it。

There is something wrong with… ……有毛病

There is no doubt of/that 无疑……

There is no need for/to do 不需要做……

There is no denying 无可否认……

There is no hurry about 无需慌忙……

There is no difficulty in 在……方面没有困难

There is no help for ……没有办法

There is no deference between ……没有区别

There is no lack of 有很多的，不缺乏

There is no possibility of/that 没可能

There is no room for 没有……的余地

There is no sense in ……是没有意义的

There is no sign of 没有……的迹象

There is no saying that ……难以断言，很难说

There is a chance that/of 很可能

There is a possibility that/of有可能

There is a slim hope of ……有微小的希望

There is some difficulty in 在……有困难

There is some trouble in 在……有麻烦

There appears to be 似乎有

There seems to be似乎有，好像有

There used to be （过去）常常有，原来这里有

There was a time when从前曾经有一个时候

There is evidence that ……显然

There is no probability of/that很难有/会

大写的IT是“InformationTechnology”（信息技术）的缩写，指计算机、通讯及相关技术。而小写的it是指动物、植物以及没有生命的物体。IT业（通常就指计算机业）恰好带着这两副截然不同的面孔：一副是高科技的美妙动人；一副是商场争利的贪婪赤裸。它将人类的聪明智慧、勇往直前的奋斗精神以及不择手段的发财梦想揉合在一起，促成了19世纪以来最壮观的新技术爆炸。

　1 陈述句的强调句,强调陈述句中的某个成分

为了强调句子中的有些成分,要用强调结构It is（was）+被强调部分+that（who）+其他部分被强调的成分可以是主语、宾语、状语,但不能是定语表语和谓语这种类型的强调句主要注意一下几个方面：

1）It在这一结构中作主句的主语,所以即使被强调部分是复数名词,也要用is或was

eg Tom and Mark often come to see me

It is Tom and Mark Who often come to see me （强调主语）

2）如果被强调部分是时间、地点、方式或原因也不用when, where, how, why, 而用that；强调人时可用who,也可用that

eg（1）They set out the day before yesterday

It was the day before yesterday that they set out （强调时间状语）

（2）We put off the sports meet because of the rain

It was because of the rain that we put off the sports meet（强调原因状语）

（3）It was because she was ill that they didn‘t ask her to do the job （强调原因状语从句）

3）被强调部分如果是原句的主语,who或that后面谓语的人称和数应和原句的主语一致

— Personally, I think it is the salesmanager, rather than the salesgirls, ____ to blame

—I agree with you

A is B that is C are D who are

2 一般疑问句的强调句,只需把is（was）提前

eg （1） Was it in 1939 that the Second World War broke out

（2） Is it Professor Wang who teaches you English

（3） —Was it two months ago _____ you luckily got an opportunity to spend your holiday in Canada

— _____ John was the lucky dog……

A when； Not I B when； Not only C that； Not all D that； Not me

3特殊疑问句的强调句,强调特殊疑问句中的疑问词

eg （1） Where did you find the wallet

Where was it that you found the wallet

（2） When shall we meet

When is it that we shall meet

从上面的例子中我们可以看出,特殊疑问句的强调句是由“特殊疑问词+was（is） it that +陈述句”构成的但是当含有特殊疑问词的强调句型用在宾语从句中的时候,上述句型应改为‘特殊疑问词+it was（ is） that +陈述句“,即采用陈述句语序

eg （1） — where was it ____ the road accident happened yesterday

— In front of the market

A when B that C which D how

（2） I really don‘t know _____ you returned the book to me

A when it was that B when was it C when was it that D when it was

4 有时可用It might be ……that ……,和It must have been……that……的句型表示强调

eg （1）It might be his father that you are looking for

（2）It must have been his brother that you met

5 强调not……until结构中由until引导的短语（或从句）表示时间状语的句型是：It is（was） not until……+that……+其他部分

eg 1）He didn‘t marry until forty

It was not until forty that he married

（2）Mr Yang did not leave the lab until he got everything ready for the experiment

It was not until he had got everything ready for the experiment that Mr Yang left the lab

（3）_____ he realized it was too late to return home

A Not until dark B It was until dark that C It was not until dark that D It was dark that注意：如果not……until放在句首时就要用部分倒装句式,它的语序和在not……until结构中由until引导的短语（或从句）表示时间状语的句型中的语序不同

6 强调词it与先行词it的区别

强调词it与先行词it的区别可以通过恢复原句的方式来判断,即如果把it is……that……去掉后剩下的成分仍然能组成一个完整的句子,这就是强调句型,否则就不是

It is there that accidents often happen

→ Accidents often happen there

以上就是强调句型,被强调成分是状语,把it is……that……去掉,还原成后来的非强调句

It is clear that not all boys like football

上面的句子如果去掉it is……that……后就成了Clear not all the boys like football很显然这不是一个完整的句子,因此不是强调句型,而是由it作先行词引导的一个主语从句

7 其他的一些强调句型：

It is/was+时间段+since从句,It +时间段+before从句,It is/was+时间点+when从句

1）It is/was + 时间 + since …,从……已多久了在这个句型中,主句通常用一般现在时,since从句用过去时,表示一个时间点

eg（1）It is five months since I arrived in New York 我到纽约已五个月了

（2）It is five months since I was in New York我离开纽约已经五个月了

注意：例句中five months是作为一个整体看待的,所以用it is在这类句子中,终止性动词表示从动作发生时算起；如果是状态动词或持续性动词,则从动作或状态结束时算起

2）It is + 时间+ before …在这个句型和上面一个句型中,时间都是时间段,如years,five days,twenty minutes等不过主句的时态多用一般将来时或一般过去时,从句的时态要根据主句的时态进行变化Before前的主句如果是肯定的,翻译成“在……之后才……” 主句如果是否定的,翻译成“不久就……”

eg（1）It was long before he gave an answer

过了好久他才答复我

（2）It was not long before he worked out the difficult maths problem

不一会儿他就把那道数学题解出来了

（3）It will be years before he comes back

过几年他才回来

（4）It was five o‘clock A he came to see me

It was at five o‘clock B he came to see me

It is five years D I left school

It was five years C he joined the army

A when B that C before D since

3）It was + 时间 +when从句在上述句型中it指时间,when引导的是时间状语从句

eg（1）It was at midnight that I got back home yesterday

（2）It was midnight when I got back home yesterday

第一句是强调句型,被强调的时时间状语,因此用介词短语表达,而第二句是一般句型,时间以名词的方式表达,用来作表语

二、谓语动词的强调

it is……that……结构不能强调谓语,如果需要强调谓语,用助动词do, did或does如：

Do come here tomorrow

He did write to you last week

Mary does study hard now

想做英语的练习题的话我建议你可以去我要模考网看看,上面的题型挺全的

it 作形式主语主语从句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。这分四种情况：(1) 对于以连词that引导的主语从句，通常用形式主语it替代主语从句：(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：(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。如：(4) 如果句子是疑问句，则必须用带形式主语it的结构：

1-1○连词that引导的主语从句，通常用形式主语it替代主语从句It is +名词+从句

It is a fact that… 事实是……；It is good news that … 是好消息；It is a question that … 是个问题；It is common knowledge that … 是常识类似的名词还有：a pity；a wonder；a good thing； no wonder； surprise等it is no surprise 毫不惊奇地例如

It is a mystery to me how it all happened

这是怎么发生的，对我来说就是一个谜。It is common knowledge that the whale is not a fish鲸鱼不是鱼，这是一个常识。It is no surprise that China is making progress on such fronts: the manufacture of large passenger aircraft and high-speed trains, research in yeast and aerospace

中国在很多尖端领域，如大飞机制造，高铁、干细胞、

航天航空研究等领域取得飞速发展一点都不惊讶。

It is +形容词+从句

it做人称代词，可以指代事物，动物，婴儿，未知的人或者未知的事；it也可以作指代前文提到的事物，比如：It this your pen ？Yes，it is

It作主语的句型

1It takes sb some time to do sth

2It's (about/high)time that…should+动词原形/一般过去时

3It is the + 序数词 +time …+现在完成时

4It was+段时间+before…

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