it作人称代词，可用来代替人、物或事。接下来，我给大家准备了it在英语里的用法,欢迎大家参考与借鉴。
it在英语里的用法
Who is knockingat the door—It's me谁在敲门是我 。
The ant is not gathering1 this food for itself alone Ithas two stomachs in its body蚂蚁不只 是为自己采食。 它的身体里有两个胃。
When service is interrupted2, as it was by last night'sstorm, John has to inform the pu blic what the company isdoing about the problem每当供电中断时，就像昨夜因暴风雨而造成的那样 ，约翰就必须通知大家，公司为解决这个问题正在做些什么。
二、作非人称代词，表示时间、天气、季节、距离、环境等。
It is tea time Mrs Tuner goes into the kitchen到了喝茶的时间了，特纳夫人走进了厨房。
It was winter it was ten degree below zero现在是冬天，气温是零下10度。
It is only half an hour walk to the tall tower 只有半小时的路程就可以到达高塔了。
It will be lovely in the park today今天公园里一定很好玩。
三、作先行词。
1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，使全句看上去平稳一些。 “it”没有实际的意义。
It is fun for her to study, but it is difficult to studyand work at the same time对于她来说学 习是有趣的，可是要边工作边学习对她来说是困难的。
It is necessary for them to get an electrician3 to do thework for them对他们来说请一位电工来为他们做这项工作是必要的。
It will be no good learning4 without practice 学习而不实践是不好的。
It is no use talking to him about it和他谈这事没用。
It is possible that they're finished the bridge他们完成这座桥是可能的。
It is important that we should learn from each other andhelp each other我们应当互 相学 习，互相帮助，这是很重要的。
2作形式宾语。这种情况通常只用于能带以名词或形容词作宾语补语的动词后面。
In the 1870's, when Marx was already in his fifties, hefound it important to study the si tuation in Russia, so hebegan to learn Russian在19世纪70年代，马克思已经五十几岁了，他觉得研 究俄国的形势很重要，便开始学习俄语。
This has made it necessary for agriculture and industryto develop very quickly这就使得工 农业必须飞速发展。
四、构成强调句型。为了强调句子的某一成分，把引导词“it”用在句首，这种强调句 的结构是“It is (was )+所强调的成分(主语、宾语、状语)+that…”，表达的意思为“是…， 正是…，就是…”。“it ”在这种句型中本身没什么实际意义。
My temperature! It's my back that hurts我的体温!是我的背痛。
It is not only blind men who make such stupid mistakes 决不只有盲人才犯这样愚蠢的错误。
这里需要说明的是：如被强调的是人，则后面用who或that，如被强调的是物或其他 情况，则用that。
It was yesterday that I met Bob in your room 我就是昨天在你的房间遇见鲍勃的。
It was in your room that I met Bob yesterday 我就是在你的房间昨天遇见鲍勃的。
It was Bob that I met in your room yesterday 昨天我在你房间遇见的就是鲍勃。
相关 文章 ：
1 英语学习:it的用法
2 英语单词学习:it指人的用法
3 make it的用法例句参考
4 if句型的用法总结英语用法
5 英语高级语法
6 初三英语教程视频:Unit 9 When was it invented
以下是我为大家整理的it 的用法 总结 ，希望能帮助大家更好地认识it这个单词，提高英语水平。
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，表语或状语。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 。
It was about 600 years ago that the first clock with a face and an hour hand was made
It was they that (who ) cleaned the classroom yesterday
It was in the street that I met her father
2 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
3 It is important ( necessary, right, strange, natural) that
该句型和上一个同属一个句型。由于主句中的形容词不同，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。
It is important that we (should) learn English well
It is necessary that he (should) remember these words
4 It is 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"，可以说是 not until 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
= I didn’t realize she was a famous film star until she took off her dark glasses
5 It is said (reported, learned) that
该句型中的it 仍是形式主语，真正主语是that 引导的主语从句。该结构常译为"据说(据报道，据悉)"。
It is said that he has come to Beijing
It is reported that another earth satellite has been put into orbit
6 It is suggested ( ordered ) that
该句型和上一个同属一个句型。主句中的过去分词是表示请求，建议，命令等词时，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)
It is suggested that the meeting ( should ) be put off
It was ordered that we ( should ) arrive there in two hours
7 It is a pity ( a shame ) that
该句型中，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。
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!
It is a pity that he is ill 他生病了，真遗憾!
8 It is time ( about time ,high time ) that
该句型中that 后的从句应该用虚拟语气，值得注意的是① 常用过去时态表示虚拟② 有时也用should + 动词原形，should 不能省。常译为"是(正是)的时侯"。
It is time that children should go to bed
= It is time that children went to bed
9 It is the first ( second ) time that
该句型要和上一个句型区别开来。该句型中的 that 从句不用虚拟语气，而用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态;如果是一般过去时，后面从句则用过去完成时态。该结构中 that 可以省去;it有时用 this 替换常译为"是第一(二)次"。
It is the first time I have been here
= This is the first time I have been here
10 It is since
该句型主要用作处理瞬间动词的完成时，又要和表示一段时间的时间状语连用的问题。主句中是时间作表语，其时态是现在时或完成时，since 引导的从句通常是一般过去时态，而且是瞬间动词。如果主句是一般过去时，从句则用过去完成时。
It is ( has been ) 5 years since his father died
11 It is when
该句型中的 when 引导的是一个时间状语从句，主句中的 it 指时间，表语由具体的时间充当。常译为"当的时候，是"。
It was 5 o’clock when he came here
12 It be before
该句型主句中的 it 指时间, 主句中的时态常是将来一般时或过去时两种时态主句中的表语多是long, not long , 3 days , 2 weeks 等表示时间段的词或 短语 。常译为"之后"。
It was 3 days before he went to Beijing
It will be not long before he finishes his job
13 It happens (seems, looks, appears ) that
该句型中it是形式主语，that 引导的是主语从句，主句中的happen , seem等词是不及物动词
It happened ( so happened ) that he met his teacher in the street 碰巧
It seems that he will be back in a few days 看来
14 It takes sb to do sth
该句型中的不定式是真正的主语，it是形式主语，句型中的直接宾语是时间。常译为"做要花费某人"。
It took thousands of people many years to build the Great Wall
15 It is no good (use ) doing sth
该句型中的真正主语是动名词短语，主句中的表语可以是no good , ( not any good ) , no use , ( not any use )。
It is no good learning English without speaking English
16 It doesn’t matter whether ( if )
该句型中whether(if) 引导的从句是真正主语，该句型常译为 "不论(是否)没关系。
It doesn’t matter if they are old
17 It is kind ( of sb ) to do sth
该句型中的不定式短语是真正主语，如果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形容词。常见的有： 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
It is kind of you to say so
= You are kind to say so
18 It is necessary ( for sb ) to do sth
该句型与上一个同属一个句型。如果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，安全等情况的形容词。常见的形容词有：① important, necessary, natural ② easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant等。
在①中的形容词作表语可以用从句改写， 如：
It is important for her to come to the party
= It is important that she (should ) come to the party
19 It looks ( seems ) as if
该句型中it无意义。 as if 引导一个状语从句。常译为，"看起来好象"如果与事实不相符合，则用虚拟语气
It looks as if he is ill(真的病了)
It looks as if he were ill (没有生病)
It seemed as if he were dying
20 We think it important to learn a foreign language
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。
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
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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
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It的用法:
a某样东西：where’s my mapI left it on the table
b抽象事物: you’ve savedmy life I shall never forget it
c不知性别的孩子: her new babyis tiny It only weighs 2 kilos
d某种感觉或情况: does it itchmuch Where does it hurt
e是谁：who is that----- It’s me
f时间、日期等:what time is it ---- it is eight o’clock
g天气、环境等: it’s raining
h距离: how far is itto Chicago
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