初二it做形式主语讲解汇编
“I t”形式主语
Examples:
1.It’s necessary for the young to master two foreign language
2.It is no use arguing about the matter with him.
3.It’s a pity that you fail the exam.
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。
一、代替动词不定式做主语
拒绝是令人遗憾的。
It’s a pity to refuse.
记住这点是很重要的。
It’s very important to remember this point.
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”
It’s necessary for the young to master two foreign languages.
It is unwise to give the children whatever they want.
2.It + be + 形容词+ of sb. + to do sth
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。某人和这些形容词可以构成主系表结构。
It’s very kind of you to help me with the work.
=You are kind to help me with the work.
It’s foolish of you to drive a car after drinking.
=You are foolish to drive a car after drinking.
3.It + be +名词词组+ to do sth
It is not a good habit to stay up too late.
4.It takes/took sb +some time/ money to do sth做某事花了某人多长时间或多少钱
It took the workers almost three years to finish building the dam.
It will take a whole day to get to the top of the mountain on foot.
二、it代替动名词做形式主语
It is no good use crying over spilt milk. (覆水难收)
It is no use casting pearls before swine. (不要明珠暗投，对牛弹琴)
It + be + 名词或形容词+ 动名词
这类名词和形容词常常是：good, no good, no use, a waste of…, useless, senseless等
It’s a waste of time talking to her any more。
It is no use arguing about the matter with him.
三、it代替从句做主语
1.it + be + 名词词组+ 主语从句
这类名词有：a fact, a pity, a shame, an honor, a question, a surprise……..
It’s a pity that you lose your money
2.it + 不及物动词+ that(as if )+ 从句
这类不及物动词有：look, seem, appear, happen, occur,
It seems that he does not tell the truth.
It occurs to me that I forgot to lock the door!我突然想起我忘记锁门了
3.it + be + adj + that从句
It is necessary/impossible/important/natural that sb. (should) do sth.
It’s important that we (should) keep the balance of nature
4.
5.it + be + -ed(过去分词)+ that 从句
it is said that …….. 据说……..
it is reported that ………据报道
it is supposed that……据推测
it is well known that ……众所周知
it is generally considered that …普遍认为
it is suggested that ……有人建议
实战演练：
1. It is generally considered unwise to give_______ a child he or she wants.
A. however
B. whatever
C. whichever
D. whenever
2. In fact____is a hard job for the police to keep order in an important football
match.
A. this
B. that
C. there
D. it
3. _____is a fact that English is being accepted as an international language.
A. There
B. This
C. That
D. It
4. Is _______ necessary to take off our shoes when we enter the lab?
A. everyone
B. this
C. her
D. it
5. ________ will take you a lot of time to find him in the crowd.
A. It
B. I
C. We
D. They
6. It is no use his _________ there, the situation is hopeless now.
A. to go
B. to be going
C. going
D. having gone
7. It is never too late to learn, ________?
A. is it
B. isn’t it
C. does it
D. doesn’t it
8. ___________ is known to all that Shenzhou VI Launched Successfully.
A. As
B. What
C. It
D. That
9. _______ is reported in the newspaper, the Earthquake in east China's Jiangxi Province killed 13 people
A. It
B. As
C. That
D. What
10. ___________ certain that his invention will make people’s life convenient.
A. That’s
B. This is
C. It’s
D. What’s
11. _________ that there is another football match on the air this evening.
A. It says
B. It was said
C. It is said
D. What was said
12. __________ that their daughter got an opportunity to study abroad.
A. It’s a exciting news
B. This is an exciting news
C. This is exiting news
D. It’s exciting news
It作形式主语常见用法
It作形式主语常见句型 1.It + be +形容词+ that-从句 可用于此句型的形容词有: wonderful, true，good，right，wrong，（un）important，useless，surprising，disturbing,frightening,alarming,clear，unusual，lucky，certain, necessary等。如： ①It is quite certain that he will be at the meeting.他将出席会议是无疑的。 ②It is surprising that he came late to school this morning.他今天早上迟到真令人惊讶。 ③It is important that we (should) study hard.我们努力学习是很重要的。 注意: 该句型中的形容词是（un）important, necessary等时，从句应为(should )+动词原形。 It is important that we (should) learn English well. It is necessary that he (should) rember these words. 2.It + be +名词+ that-从句 适用该句型的名词（词组）有: a pity，an honor，a good thing，a fact，a surprise，a question,a shame,a custom, a truth,our hope, no wonder, good/bad manners等。如： ①It is a pity (that) you missed the sports meeting last week.你错过了上周的运动会太可惜了。 ②It is a fact that Engl ish is being accepted as an international language.事实上英语已经被作为一种国际语言而接受了。
It作形式主语
It作形式主语和形式宾语，虽然是我们高中就学过的语法点，但在考研英语题型中，无论是在阅读还是翻译，常会考查该知识点。 一.it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，使全句结构上前后平衡。“it”并无实际意义。It之后的谓语部分，可以是be+形容词，be+名词(词组)，或be+过去分词等。 it 作形式主语，主要分为下列三种情况：不定式作主语、动名词作主语和名词从句作主语。具体分析如下： 一、不定式作真正主语主要用于下列句型： 1. It + is/was + adj./n.+ to do sth. A.名词作表语。主要有a pity, a pleasure, an idea等。 It is a good idea to think this way. 这样考虑问题是个好办法 除be外，其他动词也有跟名词的情况。例如： It seems a pity to waste the food. 浪费这些食物真可惜。 B. 形容词或形容词短语作表语。分两种情况： 1.下列形容词；kind,good,nice,clever,wrong,right,foolish,wise,unwise,stupid,rude,careless,cruel,brave ,naughty,polite,selfish等词作表语时，不定式前常可加一个由of引起的短语，来说明不定式指的是谁的情况。形容词表示不定式逻辑主语的特征，即形容词用来描述不定式行为者的性格、品行等。例如： It was foolish of you to leave school.你中途退学，真是傻瓜。 2. 其他形容词作表语，常见的形容词有：necessary, hard，important, difficult, easy, possible，common等。 It is necessary to learn English. 需要注意的是：动词不定式作主语，一般情况下用it作形式主语，而把动词不定式（从句）放在后面。也可以直接用不定式作主语。例如： It is wrong to tell lies. = To tell lies is wrong. 撒谎是不对的。 但在疑问句和感叹句中，只能用it作形式主语。例如：
It”作形式主语和形式宾语用法详解
新希望英语语法精讲------“I t”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： ① It + 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。) 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. (你昨天没看成那部电影真遗憾。) It is a truth that there would be no new China without the Communist Party. (没有共产党就没有新中国，这是毋庸质疑的。) 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. (据说他们发明了一种新型电脑。) It is believed that China will become one of the strongest countries in the world. (大家都相信中国将会步入世界强国之列。) It was reported that more than 170 thousand people died in the 2004 tsunami. (据报道，至少有十七万人在2004年那场海啸中丧生。) ④ It + seems / appears / happens等不及物动词 + that ….
初中英语语法：it用作形式主语的用法
初中英语语法：it用作形式主语的用法 一、基本用法 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： Is it necessary to tell his father everything? 有必要把这个切都告诉他父亲吗? It’s no good sitting up too late. 熬夜没有好处。 It is quite clear that he has read the book. 很显然，他读过这本书。 It doesn’t matter what he says. 他说什么没关系。 二、几种特殊的形式主语 (1) 用作动词look, seem, appear, happen, occur, follow等的主语(后接that从句或as if从句)： It seems as if it is going to rain. 看来要下雨了。 It seems that he knows everything. 他好像什么都知道。 It (so) happened that I had no money with me. 碰巧我没带钱。 From this witness it follows that he must be guilty. 根据该证人的证词判断，他一定有罪。 (2) 当系表结构后接有if 或when引出的状语从句时，通常在系表结构前使用形式主语表示说话人对某情况的看法： It was a great surprise to me when he did a thing like that. 他这样做使我很吃惊。
初二it做形式主语讲解
'tI形式主语 Examples: 1. It' necessary for the young to master two foreign language 2. It is no use arguing about the matter with him 3. It'a pity that you fail the exam. 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。 一、代替动词不定式做主语 拒绝是令人遗憾的。 It 'a pity to refuse. 记住这点是很重要的。 It 'very importa nt to remember this point. 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, possiblewise, necessary, impossible, likel y, obvious, use 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” It ' s necessary for the young to master two foreign Ianguages. It is unwise to give the children whatever they want. 2. It + be + 形容词+ of sb. + to do s_jh 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, con siderate等。某人和这些形容词可以构成主系表结构。 It ' s very kind of you to help me with the work. =You are kind to help mewith the work. It s foolish of you to drive a car after drinking. =You are foolish to drive a car after drinking. 3. It + be +名词词纟组+ to do sth It is not a good habit to stay up too late. 4. It takes/took sb +some time/ money to do st做某事花了某人多长时间或多少钱 It took the workers almost three years to finish building the dam. It will take a whole day to get to the top of the mountain on foot. 二、it代替动名词做形式主语 It is no good use crying over spilt milk.覆水难收）
(完整版)it做形式主语用法大全含练习及问题详解
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，wise 6. 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。某人和这些形容词可以构成主系表结构。如： It’s very kind of you to help me with the work. =You are kind to help me. It seemed selfish of him not to share his dictionary with others. =He seemed selfish not to share his dictionary with others. 7. It + be +名词词组+ 动词不定式，如： It is not a good habit to stay up too late. 8. It + be + 名词或形容词+ 动名词，这类名词和形容词常常是：good, no good, no use, a waste of, useless, senseless等，如： It’s a waste of time talking to her any more. It is no use arguing about the matter with him. 9. It + take ( sb. )+ 时间（金钱）+ 动词不定式，如： It took the workers almost three years to finish building the dam. It will take a whole day to get to the top of the mountain on foot.
It作形式主语的几大基本句型
“It”作形式主语的几大基本句型 2011-06-07 22:27:53| 分类：语法归纳| 标签：|字号大中小订阅 ◇It’s +形容词/名词+that +从句 It is necessary that you train yourself before the walk. It is important that you have your own support team. It was a pity that he lost the game. It’s a pity that you missed the exciting football match. ◇It’s +形容词+(for sb) +to do sth It is difficult to walk through eight country parks. It is useful to have support teams. It is important for him to finish it in ten hours. It is necessary for people to learn team spirit. 特别提醒： ☆该句型的否定结构为It’s +形容词+(for sb) +not +to do sth It is very important not to give them too much food. (7B 100) It is very polite not to speak loudly in public. ☆该句型有时可以与It is + adj. + that从句的句型互换使用，意思不变。如：It is necessary for you to train yourself before the walk. = It is necessary that you will train yourself before the walk. ◇It’s +名词+to do sth It’s everyone’s duty to obey the law. It is not a good habit to stay up too late. As a student, it is bad manners to come late to class. It is my turn to clean the blackboard.
常用it作形式主语的句型结构
常用 it 作形式主语的句型结构 ?It + be +形容词+ that-从句 可用于此句型的形容词有 : wonderful, true，good，right，wrong，(un)important ，useless，surprising， clear, unusual, lucky, certain, necessary等。女口： ①It isquite certain that hewill be at the meeting. ②It is surprising that he came late to school this morning. ③It isimportant that we(should) study hard 注意：该句型中的形容词是(un) important, necessary等时，从句应为(should )+动词原形。 ?It + be + -ed 分词 + that-从句 适用该句型的过去分词主要有：said,reported, announced,hoped,thought, told, believed, expected, decided, suggested,known 等。如： ①It ishoped thatonedaytheywill haveenoughanimalsto setthem free ②It is well known that the earth goes around the sun. ③It is suggested that the sports meeting (should ) be put off until next week. 注意：该句型的过去分词是suggested时，从句应为(should )+动词原形。 ?It + be + 名词 + that-从句 适用该句型的名词 (词组) 有：apity, anhonor, agood thing, afact, asurprise, goodnews, one's duty 等。如： ① It isapity (that)you missedthesportsmeetinglastweek. ② It isafactthatEnglish isbeingacceptedasaninternational language. ?It ＋seem／ appear／ happen 的适当形式＋ that 从句。该句型常可以转换成含不定式的简单句。如： ①It seemsthat thereisabig wastepipecomingdown from the town. T There seemsto be a big waste pipe coming down from the town. ②He appearedto becalm,but insidehisheartwasbeatingwildly with fear. t It appearedthathewascalm,butinsidehisheartwasbeatingwildly with fear. ?It does n't matter ( It 'no won der; It does n 'make much differe nee 等) ＋ when/ where/ which/ whether 等从句。如： ①Does it matterif hecan'tfinish thejob ontime? ②Theyareallclassmates. It isnowonder they should help eachother with their studies. ?It + be+ adj./ n. (for sb./ ofsb.)+ todosth. 该句型中的形容词通常是表示事物的特点或特征的如 difficult , hard, easy, impossible, necessary, important 等,此时用 fo r ；或表示人的性格特征或特点的如nice, good, bad, kind, silly, foolish, wise, clever, careless, rude, brave, cruel, careful, grateful等，这时要用 of。如： ① It is foolish of you to give up such a good chance. ② It is necessary for college students to master at least a foreign language 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：
雅思考试it作形式主语的用法
雅思考试it作形式主语的用法 雅思考试中，it这个词的用法还是很变化多端的。考虑到它在雅思考试中的高出现率，今天天道雅思论坛小编就来为同学们做一个雅思辅导，说一说it的用法。以下是今天的精彩讲解。 雅思考试，先来了解一下it作形式主语的用法： (一)什么是形式主语 作为形式主语的it并无实际语义，是为满足语法上的需要，避免句子头重脚轻，它代替的是句子的逻辑主语。 (二)形式主语it所在的句型类别 1、作不定式的形式主语 (1)句型 It;is;+;a;pity/a;pleasure;+;to;do;sth. It;is;+;wrong/right/wise/cruel/naughty/selfish;+;of;sb.;+;to;do;sth. It;is;+;necessary/hard/important/difficult/possible/common;+;for;sb.;+;to;do;sth. (2)雅思范文写作实例 A.;Beyond;this,;it;is;also;of;paramount;importance;to;use;theaters;and;museums;as;the;“social;classroom”;of;culture;and;history;education. B.;I;think;it;is;by;no;means;pointless,;in;any;way,;to;try;to;keep;traditions;alive;wit h;technology.;(Cambridge;3,;P162,;Task;2) C.;It;is;difficult;to;say;who;has;the;right;to;judge;whether;children;working;is;“wron g”;or;“valuable”.;(Cambridge;3,;P164,;Task;2) D.;…,;it;is;important;to;remember;that;children;need;to;d evelop;skills;other;than;inte llectual;ones,;and;…(Cambridge;3,;P168,;Task;2) E.;Finally,;I;think;that;it;is;also;important;to;remember;that;children;need;to;relax;a s;well;as;work,;…(Cambridge;3,;P168,;Task;2)
It 作形式主语的三种句型
It 作形式主语的三种句型 【热身训练】 Ⅰ. 单项选择 ( ) 1. — Is it to talk with her? — Yes. She is not always friendly to others. A. kind B. easily C. meaningful D. tough ( ) 2. It is meaningful us action to protect our Earth. A. of; to take B. for; to take C. of; taking D. for; taking Ⅱ. 按要求完成下列各题。(第3~4题翻译句子；第5题改写同义句) 3. 加入他们做一些志愿者工作很有趣。 4. 对孩子们来说，在马路上踢足球是危险的。 5. It is important that we should understand our parents. is important us our parents. 【融会贯通】 It is + adj. + that从句 用法简介 该句型中that从句在句中作主语，it作形式主语。这个句型常用来说明对某事的感受。句型意为“某人做某事是……”。 典型例句 It’s necessary that you wash your hands before meals. 你饭前洗手是必要的。 It’s + adj. + (not) to do sth. 用法简介 这是动词不定式短语作主语的最常用句型。动词不定式短语作主语时，常用it 作形式主语，而将真正的主语(动词不定式短语)后置，以保持句子的平衡。句型意为“(不)做某事是……”。 典型例句 It’s important to learn a foreign language. 学一门外语是重要的。 It is very polite not to speak loudly in public. 在公共场合不大声说话是非常礼貌的。 It is + adj. + for / of sb. (not) to do sth. 用法简介 这是I t’s + adj. + (not) to do sth.的延伸句型。当动词不定式短语作主语，且其含有自己的逻辑主语时，在动词不定式短语之前用介词for或of引出其逻辑主语。 典型例句 It is very easy for me to finish the work. 完成这项工作对我来说是很容易的。 It’s very kind of you to help me. 你能帮我，真好。
考研英语翻译技巧——it形式主语句型
考研英语翻译技巧——it形式主语句型 考研英语中，形式主语通常是指it作形式主语的情况。在翻译时，我们一般都将其处理为固定词组，置于句首。形式主语分为以下两种： ①It is+v-ed+that It is said that...据说……；It is reported that...据报道……；It is estimated that...据估计……；It is suggested that...据建议……；It must be admitted that…必须承认……；It should be realized that...应该意识到……；It can be found that...可以发现……；It is agreed that...大家一致认为……；It cannot be denied that…不能否认……；It may be said without f e a r o f e x a g g e r a t i o n that…毫不夸张的说…… ②It is +adj.+that It is clear/certain/natural/necessary that...是很明显/很肯定的/很自然/很有必要的。例如：It is strange that she should have failed to see her own shortcomings.奇怪的是，她并没有看到自己的缺点。 考研英语中，it作形式主语的情况常出现在主语从句中，且以It 作形式主语置于句首，而that引导的真正的主语从句置于句末。主要有两种情况：it形式主语+主语从句；it形式主语+不定式。下面我们将通过真题例句，介绍这两种情况下句子的翻译技巧。（本文由太阳城考研1号编者原创）
“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 it既可作人称代词，用来表示动物或无生命的物体等，也可以作无人称代词，在句中作主语，表示“时间”、“距离”、“天气”等。它还可以引导强调句，使语气得以加强。此外，it在句中能作引导词，充当句子中的形式上的成分，如形式主语、形式宾语等。 ㈠it作形式主语：it作形式主语时没有具体的意义，而只是帮助把真正的主语移到句子后部去，使句子显得平稳一些。it作形式主语时，可以代替三种形式：不定式、动名词和主语从句。 1. it代替不定式短语常用于下列句型中： It + be +形容词+ (for/of sb.) to do sth. It + be + 名词+ to do sth. It takes sb. some time to do sth. 干…花了某人…时间 It’s up to sb. to do sth. 干…是某人的职责或义务 如：①It is everyone’s duty to obey the law.遵守法律是每个人的义务。 （it作形式主语, 代替不定式短语to obey the law） ②It is difficult for a foreigner to learn Chinese.对于一个外国人来说，学习汉语是困难的。 （it作形式主语, 代替不定式短语to learn Chinese） ③It is not right to use these places as rubbish dumps.把这些地方用来倒垃圾是不对的。 （it作形式主语, 代替不定式短语to use these places as rubbish dumps） ④It took them a year to build the bridge.建这座桥花了他们一年的时间。 （it作形式主语, 代替不定式短语to build the bridge） ⑤It is bad manners to stare at people.瞪着眼睛看人是不礼貌的。 （it作形式主语, 代替不定式短语to stare at people） ⑥It is up to us to help those in need.帮助那些有困难的人是我们的责任。 （it作形式主语, 代替不定式短语to help those in need） ⑦It is not up to you to tell me how to do my job.我怎样干我的工作不用你来多嘴。 （it作形式主语, 代替不定式短语to tell me how to do my job） ◆ It be + 形容词+ for sb. to do sth.与It be + 形容词+of sb. to do sth.： 如果句型中的形容词描述的是sb.的品质、品格，在逻辑上可以作sb.的表语，则sb.前应用介词of，否则就用for。如：①It’s n ecessary for us to use a short-wave radio to pick up the programmes.我们用一台短波收音机收听这些节目是必要的。
it做形式主语的19个句型教学提纲
i t做形式主语的19 个句型
It作形式主语常见句型 1.It is/was + 被强调部分 + that/who ... 该句型是强调句型。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。 2. 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. 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. It is important /necessary/ right/strange/natural... that ...+(should) do 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。 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……）”。 6. It is suggested ( ordered, required ... ) that ... +(should) do 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……）”。 7. It is a pity ( a shame ... ) that ...
IT做形式主语
用法一：it作逻辑主语综述 形式主语it 作为形式主语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻，它代替的是句子的逻辑主语，概括起来会有如下情况： 不定式作逻辑主语 如：It is very kind of you to give me a hand in time. It is my pleasure to address the meeting. It was pretty hard for him to bring up the child on his own. 从句作逻辑主语 如：It so happened that the tickets were sold out. It is extremely obvious that she has been lying about her identity. It suddenly occurred to me that the message must have been hidden between the layers of the briefcase. 动名词短语作逻辑主语 这类句子远不如前面两种出现率高，主要在（no, good, waste, useless, no use, dangerous）等词语的后面用 如：It is no use reasoning with him. It is no good reading in dim light. 作形式主语的代词只能用it ，不能用that，this等词。 例如: 1）It is easier to lose friends than to make friends. 交朋友难而失去朋友比较容易。 2）It is important for modern young people to master at least two foreign languages. 掌握至少两门外语对于当代年轻人来说是很重要的。 以上两句中的it是形式主语，真正的主语是后面的不定式短语。 3）It is considered no good reciting without understanding. 不理解的背诵被认为是没有好处的。 4）It is no use crying over spilt milk. 覆水难收。 以上两句中的it是形式主语，真正的主语是V-ing形式。 5）It is a fact that English is being accepted as an international language.英语作为一门国际语言正日益为人们所接受，这是不争的事实。（NMET,95）6）It depends on the weather whether we will go. 我们去不去得看天气行事。（其中的whether 不能换成if，因为if不能引导主语从句。） 以上两句中真正的主语是名词性从句。
It作形式主语常见用法.doc
It 作形式主语常见句型 1.It + be +形容词 + that-从句 可用于此句型的形容词有: wonderful, true ，good，right ，wrong，（un）important ，useless，surprising，disturbing,frightening,alarming,clear ，unusual，lucky，certain, necessary等。如： ①It is quite certain that he will be at the meeting. 他将出席会议是无疑的。 ②It is surprising that he came late to school this morning.他今天早上迟到真令人惊讶。 ③It is important that we (should) study hard. 我们努力学习是很重要的。 注意 : 该句型中的形容词是（ un）important, necessary 等时，从句应为 (should )+ 动词原形。 It is important that we (should) learn English well. It is necessary that he (should) rember these words. 2.It + be +名词 + that-从句 适用该句型的名词（词组）有: a pity，an honor，a good thing，a fact，a surprise，a question,a shame,a custom, a truth,our hope, no wonder, good/bad manners 等。如： ①It is a pity (that) you missed the sports meeting last week.你错过了上周的运动会太可惜了。 ②It is a fact that English is being accepted as an international language事.实上英语已经被作为一种国际语言而接受了。
“It”作形式主语和形式宾语用法详解
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。) It is a truth that there would be no new China without the Communist Party. (没有共产党就没有新中国，这是毋庸质疑的。) ③It + 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. (据说他们发明了一种新型电脑。) It is believed that China will become one of the strongest countries in the world. (大家都相信中国将会步入世界强国之列。) It was reported that more than 170 thousand people died in the 2004 tsunami. (据报道，至少有十七万人在2004年那场海啸中丧生。) ④It + seems / appears / happens等不及物动词+ that …. e.g. It seems that he enjoys pop songs very much.(似乎他非常喜欢流行歌曲。) It appears that Tom might change his mind. (看来汤姆可能会改变主意。) ⑤若句子是疑问形式，就只能用it作形式主语。 e.g. Does it matter much that they won’t come tomorrow? (他们明天不来很重要吗？) Is it true that he will go abroad next week? (他下周出国是真的吗？) ⑥It + takes + (sb.) + some time + to do sth. 这是一个表示“（某人）花多少时间干某事”的句型，其中it是形式主语，代替后面的不定式（to do sth.），句型中的sb.也可以省略。 e.g. It took me some time to read the reading materials.(我花了一些时间才读完那段阅读材料。)It took him fourteen hours to go to New Zealand from Shanghai by plane.(从上海乘飞机去新西兰花了他14小时。) How long does it take you to go to Beijing from Qingdao by train? (从青岛坐火车到北京一般要花多久时间？) I am not sure, but I think it takes at least nine hours to get there. (我不能肯定，但估计至少要九个钟头才能到那儿。) 二、It 用作形式宾语 当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，为保持句子结构平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的宾语放在句尾。此时it仍只起先行引导作用，本身无词义。下列四种情况须用it 作形式宾语：