it做形式主语用法大全含练习与答案

It作形式主语常见句型动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有：1. It + be + 形容词+主语从句，如：It is uncertain whether he can come to Jenny’s birthday party or not.2. It + be + 名词词组+ 主语从句，这类名词有：a fact, a pity, a shame, an honour，a question 等，如：It’s a pity that you missed the exciting football match.It remains a question whether he will come or not.3. It + be + 过去分词+ 主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等，如：It is reported that 16 people were killed in the earthquake.It is not decided who will give the operation to the patient.4. It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有：appear, happen, seem等，如：It seemed that he didn’t tell the truth.It happened that I was out when he called.5. It + be + 形容词+ for sb.）+ 动词不定式这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如：It’s necessary for the young to master two foreign language.It is unwise to give the children whatever they want.这类形容词有：easy, difficult, hard, important, possible，wise6. It + be + 形容词+ of sb. + 动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。

高考英语专题之it的用法1.指代上文提到过的某物。

2.指代this和that。

3.指不知性别的婴儿或身份不明确的人。

4.指时间、距离、天气、气候、温度、日期或价值。

5.it代替不定式、动名词短语或名词性从句做形式主语。

（1）It is+adj.for /of sb. to do sth.（2）It is no wonder that...……不足为奇/并不奇怪（3）It seems/appears that...似乎/看来……（4）It looks/seems as if/as though...看起来/似乎/好像……（5）It happens that...碰巧……（6）It occurs to/comes to/strikes/hits sb. that...某人突然想起……（7）It is said/reported that...据说/据报道……（8）It is certain that...肯定……（9）It is well known/acknowledged that...众所周知……（10）It is no use/no good doing sth.做某事没用/没好处（11）It takes sb. some time to do sth.做某事花某人一些时间（12).It is clear (obvious, true, possible, certain) that….“清楚（显然、真的、肯定）”（13).It is important (necessary, right, strange, natural…) that…（虚拟should+动词原形）（14).It is suggested (ordered…) that…（虚拟should+动词原形）（16）. It doesn’t matter whether………不重要，没关系(17).It is a pity/shame that...真可惜……6.it做形式宾语（1）主语+think/believe/suppose/consider/feel/make/keep...+it+adj./n.+for/of+sb.to do sth./that从句（2）主语+think/believe/suppose/consider/feel/make/keep...+it+unless/no use/no good...doing sth.7.其他与it相关的常用短语和句型(1)I take it that you don't agree with me.我想你不同意我的意见。

“it”作形式主语“it”作为形式主语，主要用于使句子平衡，避免英语句子出现头重脚轻，也就是真正的主语部分过分复杂庞大的问题。

“it”主要在以下三种情况下作真正主语：一、不定式为真正主语时：1.It is/ was+ adj.部分+ to do sth.Eg. It is necessary to finish the work before leaving for a holiday. **经常谈论“it is+ adj. for sb to do sth.”或者“it is+ adj. of sb to do sth.”的问题。

形容词后用of或者用for与形容词所形容的对象有关。

我在非谓语动词不定式部分已经讲过，如形容词形容的是sb,则用of；反之如果形容词形容的是to do sth，则用for。

所以刚才的例句可以变为：It is necessary for the manager to finish the work before leaving for a holiday.2.It is/ was+ n.部分+ to do sth.Eg. It is a great pleasure to meet friends from afar.3.It+ v.部分+ to do sth. 注意，动词不定式作真正主语时，并不是谓语部分只出现be动词，也会出现一些动词，常用的有：take, cost, need, require, make, sound, occur等等。

Eg. 1>. It takes me 20 minutes to walk from my house to school.2>. It sounds great to make a trip there.3>. It cost them almost 1 million to buy that cottage.二、动名词作真正主语时：1. It is/ was+ adj.部分+ doing sth.注意在非谓语动词的动名词部分已经提过用于此情况（后跟动名词）的形容词相对固定，有good, useless, foolish, hard, enjoyable, worthwhile和nice。

It的用法It的用法在高考中也是重现率较高的语言点，尤其是it用于强调句。

其考查方式多通过“单项填空”进行，偶尔也出现在“短文改错”和“完形填空”中。

一、要点点拔1．代替上文中提到过的人或事物。

指代人时，一般用于小孩或身份不十分明朗的人。

1) －Who is the baby?－It‘s my teacher’s son．2) －Who is that gentleman?－It's my friend Tom．He(不可用It) wants to see you．2．用于表达天气、环境、时间、距离、季节等。

例如：1) It’s half an hour’s walk from here to our school．2) It‘s nice and warm here．3) But it's two o'clock now, and it's time for us to go to school．3．用作形式主语.it 没有具体意义，而只是帮助把真正的主语移至句子后尾，使句子显得平稳一些，能借it 给移至句子后尾的主语有三种：一种由不定式表示，一种由动名词表示，一种由从句表示。

1).It 替代真正的主语——动词不定式短语.It is easier to say than to do .It is a good act to help the others.2).it 替代真正的主语——动名词短语,以动名词短语做主语的句子，主要在以no good, no use, no harm, dangerous, foolish 等词作表语的句中.It’s no harm drinking running water in that area。

It’s foolish talking like that.3).it 替代从句作主语，用从句做主语的带it 的句子很多,常见的有下面几类：①It is a pity (a shame ,a fact ,a wonder ,a good thing,etc. )that…It is a shame that he didn’t pass the exam.②It is strange ( surprising,obvious ,true, good,possible,clear,etc. ) that…。

重点代词it的用法和练习(含答案)(1)it用做人称代词的用法it用作代词，意为“它”，既可以指人，也可以指物。

it做人称代词，可以用来代替一个名词、短语、从句或句子，以避免他们在句中的重复。

这是可以指提到过的，也可以指未提到的，在句中做主语、表语和宾语。

1) 指事物，it可以知道除人以外的任何事物或动物。

I dropped my watch and it broke.我把手表掉在地上摔坏了。

2) 指人，it主用用于指性别不明的婴儿或只听其声不见其人的人，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.“Liste n. Some one is cryin g.. ”“Oh, it must be Mary. ”3) 代替某些代词。

代词it可以用于代替指示代词this, that以及复合不定代词something, anything, nothing等，如：“What' s this?”“ It' s a new machine”(2)it用作非人称代词的用法1) it用作非人称代词主要用来指时间、距离、价值、天气、气温及温度等自然现象。

如It' s too late to go there now.现在去那已经太迟了。

It rained all day yesterday昨天下了一整天雨。

2) 用于某些句型。

It' s time for sth.该做某事了。

It' s to do sth.是时候该做某事了。

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，有时候用should+ 动词原形)It' s first(second)time +that--从句。

超详细的It的用法归纳总结（附习题及答案）一、It是代词指除人以外的一切生物和事物，用来指代时间、季节、天气距离、环境。

在这里，i是一个虚词，没有任何实际意义。

例如:①It is a quarter to eight now.现在是八点差一刻。

②It is midnight. 现在是午夜。

③It is time for breakfast.现在是吃早饭的时间。

④-What is the date today?今天几月几号?--It is December 3rd. 十二月三号。

⑤--What season is it?现在是什么季节?--It is summer. 夏季。

⑥--What is the weather like today?今天天气如何?--It is fine.天气很好。

--It is foggy and wet.天气多雾又潮湿。

⑧How far is it from the bus station to your home? 从汽车站到你们家有多远?⑨It is around five miles to the shopping center.从这儿到购物中心大约有五英里。

二、It用作主语用来指代文中出现过的人或事。

it此时可用来代替一个名词，一个短语，一个从句或一个句子。

在句中可指生物,非生物，不明性别的人，也可以指一个动作或件事情(人物型)，还可以指人或事物的身份(指示型)。

在这里,it是有实际意义的。

例如:①--What is this?这是什么?--It is a computer.这是一台计算机。

②--What is that?那是什么?--It is a map.那是一张地图。

③--Where is the dog?狗在哪儿?--It is lying under the tree.它在树下面躺着呢。

④--Where is the post office?邮局在哪儿?--It is near the hospital 在小医院附近。

It 做形式主语的用法1.To learn the types of structures in this unit.2.To know how to use these structures.3.Attract students’ interest to English learning.it 代替动词不定式作主语 It 作形式主语it 代替动名词作形式主语it 代替从句作主语It 作形式宾语It 用于强调句It + be + 形容词 + for sb + to do sth It + be + 形容词 + of sb. + to do sth It + be +名词词组 + to do sthIt takes/took sb +some time/ money to do sthIt + be + 名词或形容词 + 动名词 It + be + 名词词组 + 主语从句 It + 不及物动词 + that(as if ) + 从句It + be + adj + that 从句It + be + -ed(过去分词)+ that 从句It is/was +被强调部分+that/ who +其他部分…1.当不定式（短语）、动名词（短语）或从句在复合宾语结构中作某些动词的宾语时。

2.某些表示“喜、怒、哀、乐”的动词。

3.that 引导的宾语从句不能直接作介词的宾语。

4由及物动词与介词组成的固定搭配中，宾语从句若作该动词的宾语时，须借用it 。

It 作形式主语一. 概念1. 定义与使用原因：动词不定式、动名词或主语从句作主语时，为避免头重脚轻，通常用it作形式主语，放到句首，把动词不定式、动名词或主语从句放在句末。

此时it只起先行引导作用，本身无词义。

2. it用作形式主语主要用于以下三种情况：(1)it代替动词不定式做主语(2)it代替动名词做形式主语(3)it代替从句做主语例如：It’s necessary for the young to master two foreign languages.It is no use arguing about the matter with him.It’s a pity that you fail the exam.It was noisy when I got into the room.二.it代替动词不定式做主语1. It + be + 形容词+ for sb. + to do sth.这类句型常用形容词(通常为描述事件的形容词)easy, difficult, hard, important, possible，wise, necessary, impossible, likely, obvious, useful, 等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，译为“对某人来说做某事怎么样”例如：It’s necessary for the young to master two foreign languages.掌握两门外语对年轻人来说是非常有必要的。

七年级英语It 作形式主语练习30题(答案解析)1.It is important ______ us to study hard.A.forB.toC.withD.of答案解析：A。

“It is+形容词+for sb to do sth”表示“对某人来说做某事是……的”，用介词for。

to 不能用在这个句型中；with 和of 也不符合这个句型的用法。

2.It is fun ______ games after school.A.playB.to playC.playingD.plays答案解析：B。

“It is+名词/形容词+to do sth”是固定句型，这里用to play。

play 和plays 不能直接放在这个句型中；playing 也不合适。

3.It is easy ______ math problems.A.solveB.to solveC.solvingD.solves答案解析：B。

“It is+形容词+to do sth”，用to solve。

solve 和solves不能直接放在这里；solving 也不符合这个句型。

4.It is necessary ______ a good breakfast.A.haveB.to haveC.havingD.has答案解析：B。

“It is+形容词+to do sth”，用to have。

have 和has 不能直接这样用；having 也不合适。

5.It is good ______ sports every day.A.doB.to doC.doingD.does答案解析：B。

“It is+形容词+to do sth”，用to do。

do 和does 不能直接放在这里；doing 不符合这个句型。

6.It is hard ______ English well.A.learnB.to learnC.learningD.learns答案解析：B。

It作形式主语常见句型动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用it作形式主语，放到句首，常见句型有：1. It + be + 形容词（important, impolite.necessary. easy, difficult.....）+ 动词不定式(to do sth..........)It is impolite to keep others waiting.It is important to arrive on time.2. It + be + 形容词(important, impolite.necessary. easy, difficult....).+主语从句，如：It is important that you must arrive on time..2. In fact is a hard job for the police to keep order in an important football match. (2001 上海)A. thisB. thatC. thereD. it3. is a fact that English is being accepted as an international language. (NMET1995)A. ThereB. ThisC. ThatD. It4. Is necessary to take off our shoes when we enter the lab? (MET88)A. everyoneB. thisC. herD. it5. ________ will take you a lot of time to find him in the crowd.A. ItB. IC. WeD. They8. ___________ is known to all that Shenzhou VI LaunchedSuccessfully.A. AsB. WhatC. ItD. That9. _______ is reported in the newspaper,the Earthquake in east China's Jiangxi Province killed 13 peopleA. ItB. AsC. ThatD. What10. ___________ certain that his invention will make people’s life convenient.A. That’sB. This isC. It’sD. What’s11. _________ that there is another football match on the air this evening.A. It saysB. It was saidC. It is saidD. What was said12. __________ that their daughter got an opportunity to study abroad.A. It’s a exciting newsB. This is an exciting newsC. This is exiting newsD. It’s exciting news。

it作形主语的五种IT 作为形式主语的五种情况如下：1. 结构：It + be/have/do + 名词/代词+ 形容词/副词/动词-ing/动词过去分词等形式。

例子：-It is said that he is going to join our team.（据说他将要加入我们的团队。

）-It has been raining since morning.（自从早上就一直下雨。

）2. 结构：It + 动词过去分词+ 名词/代词+ 形容词/副词等形式。

例子：-It seemed like a good idea at the time.（当时看来这是一个好主意。

）-It occurred to me that we had met before.（我想起来我们之前见过面。

）3. 结构：It + 动词-ing + 名词/代词+ 介词+ 宾语等形式。

例子：-It's interesting to learn about different cultures.（了解不同的文化很有趣。

）-It's important to keep the environment clean.（保持环境整洁很重要。

）4. 结构：It + 动词-ing/动词过去分词+ 副词等形式。

例子：-It's been a long time since we last met.（自从我们上次见面已经过去很长时间了。

）-It doesn't matter if he doesn't know.（他不了解没关系。

）5. 结构：It + 动词-ing/动词过去分词+ 宾语等形式。

例子：-It happened that I knew the person involved.（碰巧我知道涉及的那个人。

）-It occurred to me that I hadleft my wallet at home.（我想起来我把钱包忘在家里了。

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：①It + 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。

高中英语it 用作形式主语/宾语的用法及24个it句式盘点总结一、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it，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it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 it 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。

浅谈it作形式主语和形式宾语用法一、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.It is useless crying over the spilt milk. (覆水难收。

)It was really surprising that she married a man like that.② It + 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.③ It + be + 过去分词+ that ….该句型常见动词有：say, hope, think, suppose, expect, report, know, believe, decide, etc.e.g. It is said that they have invented a new type of computer.It is believed that China will become one of the strongest countries in the world.It was reported that more than 170 thousand people died in the 2004 tsunami.④ It + seems / appears / happens等不及物动词+ that ….e.g. It seems that he enjoys pop songs very much.It appears that Tom might change his mind.⑤若句子是疑问形式，就只能用it作形式主语。

浅谈it作形式主语和形式宾语用法一、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.It is useless crying over the spilt milk. (覆水难收。

)It was really surprising that she married a man like that.② It + 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.③ It + be + 过去分词+ that ….该句型常见动词有：say, hope, think, suppose, expect, report, know, believe, decide, etc.e.g. It is said that they have invented a new type of computer.It is believed that China will become one of the strongest countries in the world.It was reported that more than 170 thousand people died in the 2004 tsunami.④ It + seems / appears / happens等不及物动词+ that ….e.g. It seems that he enjoys pop songs very much.It appears that Tom might change his mind.⑤若句子是疑问形式，就只能用it作形式主语。

七年级英语It 作形式主语练习30题含答案解析1.It is important to learn English well.A.to learnB.learnC.learningD.learns答案解析：A。

本题中“It is important to do sth”是固定句型，it 作形式主语，真正的主语是后面的动词不定式“to learn English well”。

B 选项“learn”是动词原形，不能直接放在句首；C 选项“learning”是动名词形式，不符合该句型；D 选项“learns”是动词的第三人称单数形式，也不符合。

例如：It is necessary to finish your homework on time.（按时完成作业是必要的。

）2.It is fun to play games.A.to playB.playC.playingD.plays答案解析：A。

“It is fun to do sth”是固定用法，it 作形式主语，真正的主语是“to play games”。

B 选项“play”动词原形不能直接放句首；C 选项“playing”动名词形式不符合该句型；D 选项“plays”是动词第三人称单数形式不适用。

例如：It is interesting to read books.（读书很有趣。

）3.It is hard to solve this problem.A.to solveB.solveC.solvingD.solves答案解析：A。

“It is hard to do sth”，it 作形式主语，真正主语是“to solve this problem”。

B 选项“solve”不能直接放句首；C 选项“solving”动名词不符合；D 选项“solves”第三人称单数形式不对。

例如：It is difficult to climb the mountain.（爬山很难。

七年级英语It 作形式主语练习30题含答案解析1. _______ difficult for me to play the piano well in a short time.A. It isB. This isC. That isD. I'm答案解析：A。

在这个句子中，It作形式主语，真正的主语是后面的“to play the piano well in a short time”，这种结构是“It is + adj. + (for sb.) to do sth.”，表示做某事对某人来说是怎么样的。

选项B“This is”和选项C“That is”没有这种用法，不能作形式主语。

选项D“I'm”表示“我是”，不符合句子结构和语义。

2. _______ a lot of time to go to school on foot every day.A. It takes meB. It spends meC. I takeD. I spend答案解析：A。

这里考查“It takes sb. some time to do sth.”这个句型，It作形式主语，表示花费某人多少时间做某事。

选项B中“spend”的主语应该是人，用法是“sb. spend some time (in) doing sth.”，所以该选项错误。

选项C和D的主语是I，不符合这个句型的结构要求。

3. _______ important to keep our classroom clean.A. ItB. ThatC. ThisD. They答案解析：A。

此句运用的是“It is + adj. + to do sth.”结构，It作形式主语，真正的主语是“to keep our classroom clean”。

选项B“That”、选项C“This”和选项D“They”都不能在这种结构中作形式主语。

4. _______ interesting for my sister to draw pictures.A. It'sB. ItsC. That'sD. She's答案解析：A。