it 的各种用法及与it有关的句型(30张)
it的用法归纳
it的用法归纳
1. 代词：it可以代替前面出现过的事物、物品、动物等，做主语、
宾语、表语等。
例句：I saw a bird in the tree. It was singing beautifully. （我看见了一只鸟在树上。
它唱得很美。
）。
2. 指示代词：it也可以作为指示代词，用来指代某一事物或物品。
例句：I want this book, not that one. Give me it.（我想要这
本书，不是那本。
给我它。
）。
3. 不定式：it可以作为不定式的形式，表示“它”的含义，一般表
示时间、天气等。
例句：It’s nice to see you again.（很高兴再次见到你。
）。
4. 表示真理或存在：it可以用来表示某件事或事物的存在或真相。
5. 表示强调：it可以作为强调句的主语，强调句子中重要的信息。
例句：It was him who broke the vase, not me.（是他打破了花瓶，不是我。
）。
6. 虚主语：it可以作为虚主语出现在句首，表示无人称、无性别的
动作或状态。
英语中it用法
• It is very difficut for me to learn Spanish.
• It is getting harder every day for a poor man to get a living.
• 注意：有时不定式前面有一个of引起的短语， 表示不定式逻辑上的主语，用it作形式主语 时，构成下面句型：It is+adj.+of sb.+to do
• 这样的adj通常有：
• possible/probable/likely 很可能
• impossible/unl
显而易见
• certain
很肯定
• plain 很明显
true 真的
• clear 很清楚
fortunate 幸运的是
• It was quite plain that she didn't want to come.
it用法
it用作主语
it指代事物、动物、婴儿或未知的人 What is this?--It is a book. Someone is at the door.--Who is it? Her new baby is tiny.It only weighs 2 kilos.
• 指代天气、时间、距离、季节、事物的状 态和自然环境等
论。。。
• It was reported that they had brought down two enemy planes.(击落飞机)
• 注意：如果过去分词表示“建议、命令、愿望”等含 义的词，从句用虚拟语气“(should)+动词原形”
• suggested 建议的 ordered 命令的 • requested 要求的 desired 希望的 • demanded 要求的 required 要求的 • recommended 建议的 decided 决定的 • insisted 坚决要求的 commanded 命令的
it用法大全形式宾语形式主语
2.非人称代词it
it有时并不指详细旳东西，而泛指天气、时间、环境等， 称为非人称旳it： 2.1.指天气： It is a lovely day, isn’t it? It is a bit windy.
2.2.指时间: It was nearly midnight when she came back.
用It作形式主语旳句型： (1) It is adj.＋ to do sth. It is difficult to translate this article.翻译这篇文章 极难。
(2) It is adj. ＋ for/of sb.＋ to do sth. It is important for us to learn English.学习英语对我 们很主要。
㈠ 1.it作人称代词
1.1.it旳最基本使用方法是作人称代词，主要指刚 提到 旳事物，以防止反复:
Ningbo is a beautiful city, isn’t it?
1.2.也能够指动物或婴儿(未知性别旳婴儿或孩子): Is this your dog？No, it isn’t.
1.3.也可指抽象事物: It was a great surprise to me when he did a thing like that．
2）.It is +v-ed +that 从句 ① It is said (reported， learned....) that ...
据说（据报道，据悉．．．）“。 It is said that he has come to Beijing.
= He is said to have come to Beijing.
②不论被强调部分是哪种状语，只能用 that连接，不得使用where、when等连词.
it做主语的句型
IT 作为主语的句子类型主要包括以下几种：1. 一般陈述句：例如：IT is a beautiful day.（今天是个美好的一天。
）2. 疑问句：例如：What about IT?（怎么样？）3. 否定句：例如：IT isn't working.（它没在运作。
）4. 祈使句：例如：IT needs fixing.（它需要修理。
）5. 感叹句：例如：How amazing IT is!（多么惊人啊！）6. 一般疑问句：例如：Does IT work?（它运作吗？）7. 特殊疑问句：例如：Which IT do you mean?（你指的是哪个？）8. 选择疑问句：例如：Do you want IT or that one?（你要哪一个，这个还是那个？）9. 被动句：例如：IT is being repaired.（它正在被修理。
）10. 宾语从句：例如：I think IT is a good idea.（我认为这是个好主意。
）11. 状语从句：例如：However IT happens, we should be prepared. （无论怎样，我们都应该做好准备。
）12. 名词性从句：例如：IT is obvious that he is talented.（他很天赋。
）13. 条件句：例如：If IT rains, we will stay indoors.（如果下雨，我们就在室内活动。
）14. 虚拟语气：例如：What would IT be like if IT were summer? （如果现在是夏天，它会是什么样子？）15. 比较级和最高级：例如：IT is the best solution.（这是最好的解决方案。
）16. 倍数表达：例如：IT costs twice as much as that.（它的价格是那个的两倍。
）17. 并列句：例如：IT rains and snows simultaneously.（雨和雪同时下。
It的句型及用法
It的句型及用法1）It XXX…据说/据报道/据信…2）It XXX…看起来好像…3）It XXX…重要/必要/可能…4）It is time to…是时候…5）It is up to…由…决定。
9.It还可以作为强调句型中的主语，强调句子中的某一成分。
It was John who won the prize。
not Mary.获奖的是XXX，不是XXX。
改写：1.当代替事物时，it与one需区分。
That vase is valuable。
It's more than 200 years old.That XXX。
The vase is more than 200 years old.XXX’XXX him that he should work harder。
XXX’t help.XXX’XXX him that he should work harder。
but her advice didn't help.2.it可代替指示代词this。
that。
1)--- What's this?---It's a pen.—这是什么？—是一支钢笔。
What's this?---This is a pen.2）--- XXX?---It's Mike's.—那是谁的书？—是XXX的。
XXX?---That book belongs to Mike.3.指示代词it，常用以指人。
1）Go and XXX.去看看是谁。
Go and see who is there.2）--- Who is making such a noise?—是谁发出这样的吵闹声？It must be the children.—一定是孩子们。
Who is making such a noise?—Is it the children。
---Yes。
it must be them.4.当说话者不清楚或无必要知道说话对象的性别时，也可用it来表示。
It 的 用法(共16张PPT)
Not until I graduated from the university did I see him.
robbed me of near the school last Don’t take it for granted
It was near the school that the man in black robbed me of my mobile phone last year because of my carelessness.
children in poor areas have access Don’t take it for granted
the school last year because of my carelessness.
Who was it that robbed me of my mobile phone near the school last year because of my carelessness.
强调句的特殊疑问句
school because of my carelessness.
When was it that the man in black robbed me of my mobile phone near the school because of my carelessness.
强调句的特殊疑问句
学校规定，考试中作弊的学生将受到严惩。 The school makes it a rule that those
who cheat in the exams will be seriously punished.
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。
it 用法归纳
it 用法归纳关键信息项：1、 It 作人称代词的用法指事物指动物指婴儿指不明身份的人2、 It 作非人称代词的用法表示天气表示时间表示距离表示环境3、 It 作形式主语的用法代替动词不定式代替动名词短语代替主语从句4、 It 作形式宾语的用法动词＋ it ＋宾语补足语＋真正的宾语5、 It 用于强调句基本结构强调主语强调宾语强调状语11 It 作人称代词的用法111 It 指事物It 可以用来指代前面提到过的事物，以避免重复。
例如：“I bought a new book It is very interesting” （我买了一本新书。
它非常有趣。
）112 It 指动物当谈论动物时，如果不知道其性别或者不需要强调其性别，通常用it 来指代。
例如：“Look at the dog It is playing with a ball” （看那只狗。
它正在玩球。
）113 It 指婴儿对于不知道性别的婴儿，也可以用 it 来指代。
例如：“The baby is crying It m ight be hungry” （这个婴儿在哭。
它可能饿了。
）114 It 指不明身份的人当不知道对方的性别或者身份时，可以用 it 来指代。
例如：“There is someone at the door It might be the postman” （门口有人。
可能是邮递员。
）12 It 作非人称代词的用法121 表示天气It 可以用来表示天气状况。
例如：“It is sunny today” （今天阳光明媚。
）“It is raining heavily” （雨下得很大。
）122 表示时间It 可以用来表示时间。
例如：“It's eight o'clock” （现在八点了。
）“It was midnight when I got home” （我到家时已是午夜。
）123 表示距离It 可以用来表示距离。
it的用法及句型总结
It的用法一、Tell the functions for “it" in each sentence:1、—--What's the weather together？—-—It is fine。
2. It is hard to communicate with him。
3。
I find it hard to communicate with him。
4。
It is Li that who cleaned the classroom。
5。
It is a book。
二、It 用法归纳1,指代it（1）.用作人称代词：指代物、整个句子(2）用作非人称代词2，形式it:（1)作形式主语（2)作形式宾语3，强调it4，特殊句型5。
在答语中指代this/that：1）.—-—Whose book is that? ——-It’s mine.三、特别注意：it, one和that作替代词的用法及区别1。
it代替前面提到的同一事物,该事物既可以是可数名词也可以是不可数名词。
(特指，指代单数，指代物,同名同物）Can I borrow your pen?-Sorry，I'm using it。
2。
one代替前面提到的同类事物中的一个。
该事物只能是可数名词，前面可以有冠词，也可以被this、that或形容词修饰,其后也可以有定语. (泛指，指代可数名词，指代人或物,同名异物）I have a bike。
Do you have one?Eg：（1）.I bought a dictionary three years ago and I am still using______ now。
(2) I bought a dictionary three years ago but I am going to buy a new _______soon. （3)。
that代替前面提到的同类事物中特指的一个。
it的短语用法
1. make it（1）在口语当中相当于succeed，表示：成功、做到、说定、赶上、及时到达例It's hard to make it to the top in show business.（2）在口语中相当于fix the date for，表示“约定好时间”例—Shall we meet next week？—OK. We just make it next Saturday.2. as it is（1）相当于in fact，in reality表示“事实上，实际情况是……”例 We had planed to finish the task today，but as it is we probably won't finish it until next week.（2）相当于方式状语从句，表示“照原样”例Leave the table as it is.3. as it were相当于as one might say，that is to say，表示“也就是说，可以说，换句话说”例He is，as it were，a modern Sherlock Holmes.4. if it weren't for…/if it hadn't been for…用来引导虚拟语气，相当于without，or but for，表示“如果不是……，要不是……”例If it weren't for Tom，I wouldn't be alive today.5. that's it（1）相当于That's all. That's so much. 表示“至此为止，没有别的了”例You can have one more sweet，and that's it.（2）相当于That's right.表示“对啦”例—I guess the key to the problem is thechoice “A”—That's it.6. catch it在口语中，相当于be punished/scolded for doing sth. wrong. 表示“因做错事而挨骂，受责备，受批评，受惩罚”例We'll really catch it form our teacher if we're late for class again.7. have it（1）相当于say，insist表示“说，主张，表明，硬说”例Rumour has it that they are getting divorced.（2）相当于get to know something，表示“了解，知道，获悉”例I had it from John that she was going abroad.8. have what it takes在口语中，相当于be well qualified for，表示“具有成功的条件”例You can take it from me that your daughter has what it takes to be a star.9. so it seems / appears.10. Keep at it！（Don't give up！）相当于go on，表示“继续做，不放弃”例My teacher asked me to keep at it.11. Go it！（Go on！）拼命干，莽撞12. Now you have done it！（You have done sth. wrong.）13. Now you'll catch it！（You'll be punished.）14. As it happened，…在口语中，相当于it's a pity that…，表示“真不凑巧，真遗憾”例As it happened，they were out.15. As it turned out，…在口语中，相当于it was found to be in the end，表示“最后被证明是”例As it turned out，his statement was false.16. Such as it is（they are）在口语中，相当于although it may not be worth much，表示“虽然没有多大价值”例You can borrow my exam notebook，such as it is.17. Take it/things easy.相当于Don't worry or don't hurry. 用来劝告别人，表示“不要慌，别担心，存住气”例Take it easy！He will do it well.18. Take it from me.在口语中，相当于believe me what I say.表示“请相信我的话，我敢担保”例You can take it from me that he will make it this time.19. For what it is worth…在口语中，相当于although I'm not sure it's of value，表示“不管其价值如何”例Here is the article I promise you，for what it's worth.20. Worth it在口语中，相当于useful，表示“有好处，值得做”例Don't hesitate about it！It's worth it.21. Believe it or not.表示“信不信由你”例Believe it or not，Tom is getting married to Mary next Sunday.22. Take it or leave it. v. 要么接受要么放弃例That is my last offer. You can take it or leave it.23. It all depends/that all depends在口语中，相当于it hasn't been decided yet，表示“那得看情况，还没有定下来”例—Are you going to the countryside for holiday？—It/That all depends.24. It's up to sb.在口语中，相当于it's decided by sb. 表示“由……决定，由……负责，取决于……”例—Shall we go out for dinner？—It's up to you.。
it的用法及例句
it的用法及例句It的基本用法全部整理在下面了，大家记得收藏起来，后面经常翻看和识记这些用法，达到熟练运用。
（一）用it作人称代词1）it最基本的用法是人称代词，主要用来表示刚提到的东西以避免重复The car accelerated as it overtook me.那辆汽车一加速就超过了我。
The action of salt on ice causes it to melt.盐作用于冰而使其融化。
I don’t care what a car looks like as long as it gets me from A to B.我到不在乎汽车的样子，只要能把我从一处载到另一处就行了。
I’ve never been there but it is,by all accounts,a lovely place.我从来没去过那个地方，但人们都说那地方很好。
The boat stuck on a sandbank but we soon got it afloat again.小船在沙丘搁浅，没过多久我们就又让它自由行进了。
His book reached an even wider audience when it was filmed for television.他的书拍成电视以后，受众范围更广了。
2）也可代表抽象的事物It was acclaimed as a great discovery.它被誉为一次伟大的发现。
Will you pay cash or should I charge it to your account ? 您愿意付现金还是计入您的账？Communication technologies are far from equal when it comes to conveying the truth.交流的技术在传递事实时差别是很大的。
3）也可指动物或未知性别的婴儿- Is this your dog ?- No,it isn’t.Her baby is due next month,she hopes it will be a boy. 她怀的孩子应该下月出生，她希望是个男孩儿。
It的基本用法(共43张)
第6页，共43页。
It 指物时与one的区别
it指的是与前面已提到的事物为同一物，
此时的it等于(děngyú)“the (this, that, my...)+名词”； 而one 指的是与前面已提到的事物为同一类物， 此时的one等于“a+名词”。比较：
I have a dictionary but I’ve lent it to Mary.
Who was it that you met in the street yesterday?
第10页，共43页。
相关 链接 (xiāngguān)
1.Was it in this place ___ the last
emperor died?
A. that B. what C. in which D. where
A. it
B. that
C. these D. them
常见的有enjoy, hate, love, like, dislikeappreciate, prefer 等。
第19页，共43页。
2. I’d appreciate _ if you would turn the radio down.
A. that
第4页，共43页。
４指时间、距离、地点、天气(tiānqì)、温度、环境等
--What’s the time now? --It’s ten past eight. （时间） It was very quiet in the café. （环境） It’s about ten minutes’ walk from here. （距离）
other students?
--Honesty, I think.
it用法汇总(全)
it用法汇总用法一：指代（后行）it1.It的基本用法是用来指代上文所提到的事物。
如：A: Pass me a blue pen. B: Here it is / Here you are.2.指代不明身份或性别的人也用it；指代喜爱的事物或宠物也可用she / he。
A：Who’s it (knocking at the door)? B: It’s me."I didn’t know it was you, comrade Lenin." said the guard.The crowd moves on. No one tries to stop it.Look that lovely baby in the cradle! Oh, dear. It is crying.My car needs some more petrol. Let’s fill her up.China has a history of over 5,000 years old. She is proud of her culture.用法二：虚义it虚义it指用作没有具体语义的主语，如表示时间、天气、距离、温度等概念的用法。
When spring comes, it is getting warmer and warmer.It is cooler in Tianjin than in Beijing.It is only about half an hour’s ride from here to my home.It looks as if the college is very small.It seemed as though our plan would be perfect.用法三：形式it由于句法结构的需要，常用it作形式主语，而把真正的主语放后置。
一、形式主语：不定式、动名词以及主语从句作主语时，为避免“头重脚轻”，要将真正的主语后置。
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！。
it用法_精品文档
▪ 9. 他的陈述原来是假的。 ▪ It turned out（proved）that his statement was
false. ▪ 10.很奇怪他考试竟然没有及格。 ▪ It’s strange that he should have failed in the
▪ You’ll catch it. 你会受罚的。 ▪ I can’t help it. 我没有办法。
▪ Make it .成功做某事。 ▪ Take it easy 放松点，别急 ▪ That/it depends 依情况而定。 ▪ As sb puts it…正如某人所说的那样 ▪ Get it 理解，明白。
him. ▪ 2. 你那样做是很愚蠢的。 ▪ It is stupid of you to do so. ▪ 3. 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 ▪ 4. 你和他理论是没有用的。 ▪ It is no use your arguing with him. ▪ 5. 覆水难收 ▪ It is no good crying over spilt milk. ▪ It is worthwhile doing the work.
▪ （二）作无人称代词 ▪ it作无人称代词时，除了句中找不到它所代
表的词语外，另一个特点是它后面的内容 都是表示天气、时间、距离、度量衡及情 况等。
▪ It is fine (rainy, windy, etc.).
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当前面提到的事物不止一件时， it通常指最先提到的事物，而 This/that是指最后提到的事物。
1. We keep the ice cream machine in the spare room. It is mainly used by the children. (指 the machine)
也可以指动物或未知性别的婴儿。
What a beautiful baby， is it a boy? How about the baby? ---- I’ll take care of it.
hurt? You have saved my life. I shall never forget it.
强调句型的疑问句：
1. Who called him “comrade”? 2. How did you forget to lock the door?
Who was it that called him “comrade”? How was it that you forgot to lock the door?
3）one, ones, that, those
That替换单数可数名词或不可数名词；one只替换单数的可数名词。 The vase on the left is more beautiful than the one on the right. The coffee produced in Brazil is more famous than that in Mexico.
it +be+形容词+that从句： It is natural that they should have different views.
It +be+名词+that从句: It’s a shame that you’re sick.
it +动词（+宾语）+that从句 It happened that she wasn’t in that day. It never occurred to me that perhaps she was lying.
It 最基本的用法是人称代词，
主要代表刚提到的同一个东西以避免重复。
Look at that car. It’s going much too fast. ----Where is the car key? ---- I put it in your drawer.
也可以代表抽象的东西。
It’s all my fault .
It 用于下列句形 5） It + be + the first time that…(谓语动词用完成时态）
It is the first time in history that two Nobel Prizes have been awarded to the same person.
6） It takes sb. time to do… It took Mary 20 minutes to choose a suitable dress for the party.
强调句型的否定句： 1. I didn’t hear from her until last summer. 2. I didn’t do all this for myself.
It wasn’t until last summer that I heard from her. It wasn’t for myself that I did all this.
That只用于替换表示事物的名词， 而one/ones替换表示人和表示 事物的名词皆可。
His younger sister is taller than the elder one. I need the plastic bags, not the paper ones.
It+动词的被动语态(said/believed/thought/expected/reported/ known+that从句
It’s said that there has been an earthquake in India.
It作形式主语跟名词性从句作真正主语还有 ：
1）it +be+形容词+从句： It is not clear to me why he behaved like that.
it无所指，用在一些动词后表示特定的意义：
If I can help it，I don’t like working late into the night.
We can make it to the other side of the street. (make it, foot it, help it.)
it用于表示喜欢, 爱恨等心理活动的动词后作形 式宾语, 再加从句作真正宾语:
I’d appreciate it if you would like to teach me how to use the computer.
(see to it, like it, love it, hate it, )
It 用于下列句形： 1）It +be + 一点时间+ when…
It was Christmas Eve when I got the news of his being killed in a car crash. 2) It +be+一段时间+ since… It is/has been two years since I enjoyed myself so much. It is/has been two years since he lived here. It is/has been two years since he has lived here.
It 代表that引导的从句：
I took it for granted that you would be coming.
It代表连接代（副）词引导的从句：
He hasn’t made it clear when he is coming back. They haven’t made it known where the meeting is to take place.
ever
It 用于下列句形：
3) It +be+一段时间+ since… It won’t be long before China sends a manned
spaceship to the moon. It will be two years before she moves to a new
称为非人称代词it.
It’s raining.
It’s Thursday today.
It’s quiet here.
It’s two miles to the beach.
it作形式主语有下面几种类型：
be+形容词+不定式 It’s better to be early. be+名词+不定式 It was his duty to take care of the orphans. be+介词短语+不定式 It’s beyond me to say why. It + 及物动词+宾语+不定式 It makes me sick to think about it. be+名词+动名词 It’s no good standing here in the cold. be + 形容词+动名词 It’s helpless trying to convince her.
非人称代词it ：It 用于代替指示代词：
It 可以表示“是谁（在某处或做某事）
“Who’s that?” “It’s me.” It’s your mother on the phone.
It还可以用来泛指某件事
Isn’t it awful!
It doesn’t matter.
it 有时并不指具体东西，而指天气、时间、环境、距离等，
4）it +动词的被动语态+从句 It is not decided who will be in charge of our company.
It作形式宾语:
It 可以代表不定式：
She found it difficult to convince him. He felt it his duty to take care of them.
1) It和one
It用以指特定的前面提到过的事物，即：it替换的是同一个 事物，it前无修饰语；而one用于替换前面提到过事物中的 一个，因此，one之前或之后有修饰语。
I bought a dictionary three years ago and I am still using it now. I bought a dictionary three years ago but I am going to buy a new one soon.
house.
It won’t be long before you regret what you have done.
It 用于下列句形 4) It is time to do/ that…(谓语用过去时态）
It is time for us to give the house a thorough cleaning. It is time that we gave the house a thorough cleaning.
2. We keep the ice cream machine in the spare room. This/That is mainly used by the children. (指the spare room)