it在英语中的用法_语言综合

1、it一般指无生命的物或动物

I have bought a chair It is made of pine wood我买了一把椅子。它是松木做的。

2、it某件事（it指代的是什么，从上下文来判断）

Take it easy不要紧张。

3、做主语，指代时间、日期、距离、天气等，it做非人称代词

It is snowing on the mountains 山上正在下雪。

4、形式主语，真正主语可能是动词不定式，动名词或主语从句，一般后置。

It is dangerous to play with fire玩火是危险的。

5、形式宾语，真正宾语可能是动词不定式，动名词或宾语从句，一般后置。

I find it impossible to get on with Li Tao我发现和李涛相处不下去。

6、用在强调句it's …who/that…中，强调主语，宾语或状语（被强调的是人，用who/that；其他用that）

It was John who broke the window是约翰打破了窗户。

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…

“It” 用法及其句型和固定搭配，是英语语法的重点、难点，又是近几年考试的热点，因此在复习中应给予足够的重视。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

（2）It be adj of sb to do sth

（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

2 It替代作主语的从句常见句型

（1）It is + noun +从句

（2）It is adj +clause

It’s surprising that… (should)………竟然……

It’s a pity/shame that…(should)………竟然…

（3）It verb sb + clause= It is v-ing + clause

It+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze/bother/concern/frighten/please/anger sb that…

（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)

（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）

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 作形式宾语的常见句型：

1 verb+ it+ adj/noun (for/of) to do/clause (verb=think, believe, suppose, consider, feel, make, keep…)

五、强调句型

It is/was+被强调部分+ that(who)… 强调句型用来强调谓语动词以外的任何句子成分。当被强调部分是人时也可以用who。

在使用强调句型时需注意以下几点：

1 请注意强调句型的特殊疑问句

2 在强调原因状语从句时，只能强调由because所引导的从句。

3 在强调not … until结构时必须把not与until一起放到被强调的位置上。

4 注意强调句型与定语从句的区别。

六、It 常用的固定搭配

1 make it

(1)在口语当中相当于succeed,表示：成功、做到、说定、赶上、及时到达。

更详细的请看：）~~

在中学英语中，常用 it 替代句子。现对此作一分析和归纳，供同学们学习时参考。

一 it 充当形式主语时，可将真正的主语从句置于句末。

A 谓语动词是被动形式时，常用 it 替代主语从句。例如：

It hasn't been decided whether the meeting will be held

这个会议是否召开，尚未定下来。

B 主句是疑问句或感叹句时，则必须用形式主语 it 替代主语从句。例如：

Is it necessary that she'll come？

她有必要来吗？

How strange it is that the children are so quiet！

孩子们如此安静，真奇怪！

C it 作为形式主语，常出现在下列结构中：

1 It +be+ 形容词＋主语从句。例如：

It's possible that we'll be a little late

我们可能会晚一点儿到。

It was most likely that one third of them lost their lives

他们当中很可能有三分之一的人丧生。

2 It +be ＋分词＋主语从句。例如：

It's surprising that there are so many unhappy marriages

有这么多婚姻不美满，真是令人吃惊。

It is suggested that the task （ should ） be finished in a week's time

有人建议在一周内完成这项任务。

3 It +be+ 名词（短语）＋主语从句。例如：

It's a pity that he isn't here

真遗憾，他没有在这里。

It's a question where we can find this material

我们在哪儿能找到这种材料还是个问题。

4 It + 不及物动词＋主语从句。例如：

It doesn't matter when they'll be back

他们什么时候回来无关紧要。

It happened （ so happened ） that he met his teacher in the street

碰巧他在街上遇到了他的老师。

It seems / appears that someone is knocking at the door

似乎有人在敲门。

二 it 充当形式宾语时，真正的宾语要后置。

A 在 think， make， find， believe， feel， consider， hear 等动词后面跟复合宾语（宾语＋宾语补足语）时，要用 it 作其中的形式宾语。例如：

We think it necessary that you will help him

我们认为你很有必要帮助他。

I felt it a surprise that they were all unfriendly to me

我感到惊奇的是，他们对我都不友好。

注意：若此类动词后面没有形容词或名词作宾语补足语，则一般不用 it 作形式宾语。如不可说： We consider it that you will go there

B like， enjoy， love， hate 等表示“喜怒哀乐”的动词后面跟宾语从句时，可用 it 作形式宾语，而宾语从句要紧跟在 it 之后。例如：

I love it when you sing

我喜欢听你唱歌。

I hate it when she speaks of me

我讨厌她说我。

C 由动词和介词（除 except， but 外）构成的 think of， answer for， depend on， rely on， see to 等短语动词后面，常用 it 作形式宾语，然后再接 that 引导的宾语从句。例如：

I will answer for it that he is honest

我可以担保他是诚实的。

You may depend on it that he will come in time

你可以相信他会及时来到。

三 it 作形式主语时指主句所表示的内容。例如：

1 If it is possible， hold up the part of the body which is bleeding[!--empirenewspage--]

如有可能，就把流血的身体部位抬高。

句中的 it 是指主句 hold up the part of the body which is bleeding if 后面的 it is 常可省略。

2 I would like to see him as soon as it is possible

我想尽快见到他。

此句中只能用形容词 possible ，而不能用副词 possibly 因为 as soon as possible 是 as soon as it is possible 的省略形式。

3 I can discuss the matter with you now， if it is necessary

如有必要，我现在就可以和你讨论此事。

此句中的 if necessary = if it is necessary

四用 it 指代一个分句乃至整个句子。例如：

1 Tom's mother kept telling him that he should work harder， but it didn't help

汤姆的妈妈喋喋不休地告诉他应该努力学习，但却无济于事。

2 He is over seventy， but doesn't look like it

他已经七十多岁了，可是看起来却不像那么大。

3 John is trying to finish writing his book this month， but he won't find it easy

约翰想在这个月把书写完，不过他会发现这并不容易。

4 I've broken the mirror It can't be helped

我把镜子打破了，这是无法补救的。

5 They won the match after three hours' struggle It wasn't easy， though

他们经过三个小时的拼搏赢得了这场比赛。不过，这是来之不易的。

注意：代替整个句子的 it ，不能用在 know ， remember， try， tell， forget 等动词之后。例如：

1 － The meeting has been put off

－ Yes， I know （不说： Yes， I know it ）

2 － Remember what he told you

－ I'll remember （不说： Yes， I'll remember it ）

3 － Be sure to tell him the news

－ I won't forget （不说： I won't forget it ）

it的所有用法总结如下：

I．It 作形式主语的句型

①It + be + adj(kind , wise , careless, clever…) + of sb to do sth

Eg: It is wise of him to make such a decision他做出这样的决定是明智的。

②It + be + adj(easy , safe , common , normal …)+ for sb to do sth

该句型中adj若为important, necessary, natural, possible, strange, vital, essential等可改为从句,从句用should+动词原形。

Eg: It’s very dangerous for children to play with fire

It is important for us to learn English well (= It is important that we (should) learn English well)

③ It + be +V-ed(reported,believed, said, suggested…)+ that 从句

该句型中：⑴若V-ed为reported, believed, said等常译为“据报道”，“据认为”，“据说”。⑵若V-ed为suggested, ordered, demanded, insisted等表示“建议”,“命令”的词，从句要用虚拟语气(should)+动词原形。

Eg: It is suggested that the book (should) be revised

It’s said that Tom has been back from abroad (=Tom is said to have been back from abroad)

④ It + be + n (a pity, a shame, a fact , good news…)+ that 从句:

该句型中，从句一般用(should) + 动词原形，表示出乎意料，常译为＂竟然＂。

Eg: It 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！

⑤ It is useless/no use/no good /pleasure+ doing sth

此句型中的it是形式主语, 其后的动名词短语是真正的主语,译为“做…没有用”。

Eg : It ‘s useless arguing with him further // It’s no use talking with him, because he won’t listen

⑥ It takes sb to do sth

该句型中it是形式主语，真正的宾语是to do sth，常译为＂做……要花费某人……＂。

Eg: It took thousands of people many years to build the Great Wall

II．It 作形式宾语的句型

1sb find/ believe/ think/ feel/ consider/ make + it +n/adj +to do或从句

该句型中的it 作形式宾语。为了记忆方便我们可称该句型为“6123结构”。6 指主句中常用的动词：think, believe, make, find, consider, feel；1 指的是形式宾语 it；2 指的是宾补的两种形式：形容词或名词；3 指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。

Eg: 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

2主语＋hate / dislike / love / like ＋it ＋when－从句

Eg: I hate it when people speak with their mouths full

3 主语＋appreciate ＋it ＋if－从句

Eg: I really appreciate it if you could help me with my math

4 sb depend on/count on/rely on/see to(负责，确保)/ answer for it that…

Eg: You may rely on it that he won’t be late

You must see to it that the doors are locked before you leave the lab

5 sb take it for granted that… 认为……是理所当然的

Eg: I take it for granted that he will succeed

IIIIt 引导的时间句型

⑴ It + is/has been+ 时间段+ since引导的时间状语从句:

该句型中从句一般用过去时态，句意为“自从以来已多久了”

Eg : It is 5 minutes since the bus left 公汽开走已有5分钟了

⑵ It + be（will/was）+ 时间段 + before引导的时间状语从句:

该句型中，主句谓语动词be若为肯定式，意为“过多久才”；若为否定式时，意为“没过多久就”。

Eg : It will be long/ 3 hours before he comes back要过三个小时他才会回来

It was 3 hours before he came back 过了三个小时他才回来

⑶ It + be + 时间点+ when引导的时间状语从句

这个句型中, it 代指时间，表示时间点的词前没有介词。

Eg : It will be Monday when he comes back 他周一的时候回来

It was Monday when he came back 他周一回来的

对比：It was on Monday that he came back (强调句)

⑷ It + is (about/high) time + (that) sb did/should dosth

意为“该是某人做…的时候了”， about/high是用于加强语气，that从句用should或动词一般过去时表虚拟。

亦可转换成 It + is+ time +(for sb )to do sth

Eg : It’s (high/about) time (that) we handed in/should hand in our homework

⑸ It / This / That +is+ the first(second …) time + that sb has done sth:

意为“这是某人第…次做…”，注意time前有序数词，主句是 is 时，从句要用现在完成时；如果主句用was ，则从句须用过去完成时。 Eg : It is the third time that I have seen the film

That was the second time that I have been there

IV．It 引导的强调句

强调句形式：It + is/was +被强调的部分+ that/who从句

Eg: It was last week that I met an old friend in the street // It was because he was ill that he didn't come to school yesterday

(强调原因状语从句时，只能强调由because所引导的从句)

判断方法：将It is/was和that去掉，若该句是一个完整无缺的句子即为强调句

常考考点：

①强调句型中的主谓一致Eg: It is you，rather than he，that are to blame for the accident．

②插入从句的强调句型 Eg: It was in the restaurant where we had dinner last Sunday that you left your wallet．

③强调句型的一般疑问句、特殊疑问句形式

一般疑问句：Is / Was it + 被强调部分+ that + 句子其余部分 Eg: Was it in 1933 that the Second World War broke out

特殊疑问句：疑问词+ be + it + that + 句子其余部分Eg: When was it that he changed his mind to take part in the activity？

④强调句型用于名词性从句, 尤其注意要使用陈述语序。

Eg: I don’t know when it was that he changed his mind to take part in the activity？

⑤not until用于强调句型 It is / was not until ＋被强调部分＋ that ＋其他部分

Eg : It was not until midnight that she went back home

此句型只用until，不用till。但如果不是强调句型，till和until可通用。因为句型中It is / was not已经是否定句了，that后面的从句要用肯定句。

V．It其他常见用法：

It looks / appears as if 看起来好像……It looks as if she is ill

It seems that 似乎…… It seems that he will be back in a few days

It turns out that 原来是…… It turned out that the beautiful woman was a thief

It occurs to/strikes sb that… 突然想到……It occurred to me that I hadn’t locked the door

It happened that 碰巧…… It happened that he met his teacher in the street

It doesn’t matter whether/if…无论是…没关系 It doesn’t matter whether he will come or not

It is no wonder that 难怪… He works so hard It’s no wonder he could pass the exam

How did it come about that … “……怎么发生的？” How did it come about that his bike was thrown into the river

It all depends/that all depends那得看情况

It's up to sb由……决定，由……负责，取决于……

as it is (1)事实上，实际情况是……; (2)照原样

make it成功、做到、说定

Believe it or not信不信由你

Get it 明白了