高考英语一轮复习语法专项it用法学案
高考英语 it的用法教案
it的用法：⑴it用作人称代词：指代前面已经提到过的动物、事物、小孩或性别/身份不明的人，但应注意：指宠物时常用he/she，指大动物（马、大象等）可以用he/she；指祖国或家乡时，常用she.注意句子：He failed in the examine，and it worried him. He failed in the examine. It worried him.He failed in the examine，which worried him.⑵it用作非人称代词：常常用作句子的主语，可以指时间、距离、价格、长度、重量、日期、星期、月份、季节、气候等。
⑶it用作形式主语或形式宾语：根据句子结构的需要，人们常用it作形式主语或宾语，而把真正的主语或宾语（不定式短语、动词-ing短语或名词性从句）放在句末。
注意it作形式主语的常见结构有：①It+ be + adj/n（for sb）to do sth.②It +be + adj of sb to do sth.③It +be + adj /n+ doing sth（一般限于名词fun，good，luck，joy，use，pleasure或形容词foolish，wonderful，good，nice，interesting，useless，worth等作表语时，才用it作形式主语，将真正的动名词主语后置）④It +be + adj./n + that-clause.⑤It +be+过去分词（如said，proved，known，believed，reported，thought，hoped，decided，announced, suggested，ordered，demanded，proposed，requested，advised等）+that-clause.注意如果表语是划线部分的词，从句应该用虚拟语气。
⑥It takes sb some time to do sth.⑦It seems/looks as if….⑷it用在强调句型中：强调句型“It is/was + 被强调部分 + 其他”的用法①这一句型可以强调除谓语、表语、定语和同位语以外的任何部分；如果被强调的部分是人，可以用who/that，如果被强调的部分是事物，只能用that。
2020届高三英语一轮复习----it 的归纳复习总结教学设计
一、it 的归纳总结。
二、教学（课堂）目标：
1、知识上，让学生掌握一些重点词汇短语，熟练运用“it。
”
2、情感上，让同学们认识到抽烟的害处并引导同学们积极勇
敢面对生活和学习中的压力，健康生活。
3、能力上，学生在情景中运用和自主总结it用法。
三、教学重点：
1.“it”做引导词，（做形式主语代替不定式、动词-ing或主语从句。
）
2．“it”做引导词（做形式宾语代替不定式、动词-ing或主语从句。
）
3.“it”在强调句中的重要作用It is/was +被强调部分
+that/who 其它成分）
四、课时安排一节课（40 minutes）
五、教学过程：
第五，板书设计。
it用法教学设计
it用法教学设计《it 用法教学设计》一、教学目标1、让学生了解“it”在不同语境中的基本用法。
2、帮助学生掌握“it”作形式主语和形式宾语的结构及用法。
3、引导学生正确运用“it”进行句子的翻译和写作。
二、教学重难点1、重点（1）“it”作人称代词，指代事物、动物或不明身份的人。
（2）“it”表示时间、天气、距离等。
（3）“it”作形式主语，常见的句型结构如：It is ＋ adj ＋（for sb）to do sth（4）“it”作形式宾语，常见的句型结构如：find ／ think ／ make ＋it ＋ adj ＋ to do sth2、难点（1）学生对“it”作形式主语和形式宾语的理解和运用。
（2）如何让学生在实际语境中准确判断“it”的用法。
三、教学方法1、讲授法：讲解“it”的基本用法和重点句型结构。
2、练习法：通过练习题让学生巩固所学知识。
3、情境教学法：创设具体的语言情境，帮助学生理解和运用“it”。
四、教学过程1、导入（5 分钟）通过展示一些包含“it”的句子，如“It's a dog” “It's sunny today” “It's five kilometers from my home to school” 等，引导学生观察“it”在这些句子中的用法，从而引出本节课的主题——“it”的用法。
2、知识讲解（20 分钟）（1）“it”作人称代词展示例句：“Look at the cat It is cute” 解释“it”在这里指代前面提到的“the cat”。
再举例：“Who is knocking at the door? It's me” 说明“it”在不知对方身份时的使用。
（2）“it”表示时间、天气、距离等给出句子：“It's six o'clock now” “It's rainy” “It's about 200 meters from here to the supermarket” 分别讲解“it”在表示时间、天气、距离时的用法。
人教版高三英语一轮复习--- it的用法
“it”的用法一、教学目标：通过本课的学习，帮助同学们进一步了解“it”的用法。
二、教学重难点：重点了解it的指代用法和it用于强调句型中的用法三、教学过程：（一）、it的指代用法1.指代上文提到的某样东西Where is my dictionary?I left it right on the desk.我的字典在哪里？我就把它放在书桌上了。
2.用以代替指示代词 this,that－What's this?-这是什么？－It's a flag.-是一面旗。
3.指不知性别的婴儿（baby) 或身份不明确的人（由于某种原因而不知道对方是谁）The baby cried because it was hungry.这个婴儿因饥饿而啼哭。
－Who is knocking at the door?－It must be the milkman.一谁在敲门？一定是送奶工。
4.指时间、距离、价值、天气、气候或温度It is nine o'clock sharp now.现在是9点整。
It is raining hard outside.外面雨下得正大。
It is a long way to the factory.到工厂有很长一段路。
5.it常用来代替不定式、动名词短语或名词性从句作形式主语或形式宾语而将真正的主语或宾语后置It's not easy to learn a foreign language.学习一门外语不容易。
（代替不定式短语作形式主语）I have made it clear that nobody is allowed to smoke here. 我已经讲得很清楚了，任何人都不准在这儿吸烟。
（代替名词性从句作形式宾语）（二）、it用于强调句型1.在陈述句中，It is/was/情态动词be+被强调部分+ that/who+其他成分。
被强调部分为“人”时可用who/that,被强调部分是“非人”时用that.It is I who/that am right.( 强调主语）我是对的。
高三英语一轮复习课件 ：“it”的用法总结
考点一 it用作代词
1. 用作人称代词
（1）My friend offered me a beautiful gift, and I like it very much.（2）What will you call it if it’s a boy?（3）---Who is waiting for you at the bus stop? ---I have no idea. It may be my brother.
It was yesterday that I met Mary in the street.
it用于强调句
基本结构：It be + 被强调部分 +that /who +句子其他成分
I met Mary in the street yesterday.
1. It 无意义，不可换成this/that. 2. be 只用单数 is/was3. 被强调的部分不能为谓语动词. 4. 强调的部分是人 也可用who其它一律用that.
I
Mary
in the street
yesterday
It was I that/who met Mary in the street yesterday.
It was Mary that I met in the street yesterday.
It was in the street that I met Mary yesterday.
考点二：用作形式主语
It作形式主语时的几个常见句型: (1). It be + adj.+ (of / for sb.)+ to do sth.of 时此处 adj. 通常为描述人的属性的形容词: kind, unkind，nice ,rude，cruel，considerate，thoughtful，careful，careless等。 e.g. It's kind of you to help me with the problem.for时此处adj. 通常为描述事件的形容词：easy，difficult，hard，necessary，unnecessary，possible，impossible，likely，unlikely，right，legal，illegal，polite，impolite，clear，obvious，dangerous…e.g. It is illegal（for a teenager）to drive a car without a license.
2022届高三英语一轮复习it的用法总结课件-
译为 “据说,据报道，据悉……”that 引导的从句是真正 的主语
it 作形式主语三
3. It is a pity that he is ill.
句型结构：
➢It is + n. (a pity, a shame...) +that ...
it在句子中作__主__语，指代上文的_t_h_a_t_
5. Is it a boy or a girl? it是第__三__人称，指代性别不详的婴儿
6. The bell is ringing. It must be the postman. it是第__三_人称，指代身份未确定的一个人
7. It is Sunday today.
Grammar
“it”的用法
一、“it”的一般用法
一、代词it 判断下列代词的用法 1. The pen is beautiful and it is mine
it是第__三__人称，指代_t_h_e__p_e_n__
2. My pen is missing and I can’t find it.
it是第__三__人称，指代___m__y__p_e_n___
3. This is my new pen. I bought it yesterday.
it在句子中作__宾__语，指代上文的__t_h_i_s
4. ---Whose umbrella is that? ---It is Marry’s
1.It is amazing that at my age I am still fit.
句型结构： ➢It is + adj. + that ... it 是形式主语，真正的主语是that 引 导的从句。
高三英语一轮复习语法专题学案1：It用法小结20条
It用法小结20条知识点讲解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，其他部分置于之后，强调的主语如果是人，可以用who替换。
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他从句的方法。
It was they that (who) cleaned the classroom yesterday.It was in the street that I met her father.It was with great joy he received the news that his lost daughter had been found.A. becauseB. whichC. sinceD. that2. It was not until +被强调的部分+ that…该句型译成汉语“直到……才”，可以说是的强调形式。
It was not until she took off her dark glasses that I realized she was a film star.=Not until she took off her dark glasses did I realize she was a film star.=I didn’t realize she was a famous film star until she took off her dark glasses.It was back home after the experiment.A. not until midnight did he goB. until midn ight that he didn’t goC. not until midnight that he wentD. until midnight when he didn’t go3. 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、可能、肯定）……”，是主语从句最常见的结构。
高考英语语法一轮复习 it用法课件(共32张ppt)
代替不明身份 的人
3. What’s that? It is a desk. 代替指示代词
4. It is eight o’clock.
泛指(时间，距离， 天气，度量，温度等)
二、作引导词
1.形式主语 代替to do sth./doing sth./从句
1）It is easier to say than to do.
② It was Tom that /who I saw yesterday here．
③ It was yesterday that I saw Tom here．
④ It was here that I saw Tom yesterday． 结论：强调句中，当去掉it is (was)….that/who 后，句
种 时 间
It be ...before....
It ___w_i_ll_b__e_(be) half a year before we leave the school.
句 It was long before he ___c_a_m__e_______(come)back.
型
It be ...when...
that or when ?
It is 6 p.m. __w_h__en___she goes home from school every day.
It is at 6 p.m.__t_h_a_t___she goes home from school every day.
6. It takes sb. ... to do sth.
It be ...since..
的 It ___is__/_h_a_s__b_e_en______ (be) two years since his father died.
高考英语it用法教案
10年高考代词it考点归纳考点一：it/that/one用法区别（it主要指代前面提到的同一物；one 用来指代前面出现的单数名词，相当于a/an+单数名词，表泛指概念，往往是同类而同一物；that用来替代前面出现的特指的单数可数名词或特指的不可数名词，相当于the＋单数/不可数名词）1. I prefer a flat in Inverness to _______in Perth, because I want to live near my Mom's. (2005年普通高等学校夏季招生考试英语天津卷)A. oneB. thatC. itD. this解析：one指代上文中的flat。
2. My most famous relative of all, _______ who really left his mark on America, was Reb Sussel, my great-grandfather. (2006年普通高等学校夏季招生考试英语江苏卷)A. oneB. the oneC.he D. someone解析：the one作同位语，指代上文中的my most famous relative of all。
one作代词表示泛指，泛指某人或某物。
he作主语，不作同位语。
someone意为“某人”，泛指某人。
I prefer a flat in Inverness to _______in Perth, because I want to live near my Mom's. (2005年普通高等学校夏季招生考试英语天津卷)A. oneB. thatC. itD. this解析：one指代上文中的flat。
3. I'm moving to the countryside because the air there is much fresher than________ in the city. (2005年普通高等学校夏季招生考试英语江苏卷)A. onesB. oneC. thatD. those解析：that指代上文中的the air。
教案精选：高三英语《语法it的用法》教学设计
教案精选：高三英语《语法it的用法》教学设计教案精选：高三英语《语法it的用法》教学设计教学目标一、教学目标与要求通过本单元教学，学生应能熟练地运用表示“希望、意愿、祝愿”的常用语；复习it的用法；了解19世纪欧美白人捕捉和贩运黑人作奴隶及虐待他们的罪恶历史。
二、教学重点与难点1．重点词汇become of, once in a while, provide, the moment, go back, role, reason2．重点句型1)Born a free man, he was now in Chairs．2)What shocked him most was that the man who carried him were black．3)Worse was to come．4)All he knew was that his African ancestor taught his son and grandson the words in his own language for “river” and “guitar”!3．语法it的用法1)There’s a knock at the door．Who is it?2)It’s a lovely baby．Is it a boy or a girl?3)It is/has been three years since we last met．4)It is necessary for you to do so．5)It was in the street that I met him this morning.教学建议教学教法：高三下学期，教师按部就班的讲课文是不现实的。
但高三下册书里却有很多精彩的文章及词汇，舍弃又未免可惜。
把课文当作听力来上，即锻炼了听力，又培养了语感。
如果听力与写作结合，学生的进步会更快。
写作可以练习听后写大意（main idea），写相关内容的文章。
【高考】英语语法一轮复习it的用法 ppt课件
1. The young lady at the corner was holding a baby in her arms and ______was crying for some more milk. A. it B. one C. she D. who 2. Mr. Green kept telling her daughter not to surf the Internet too frequently, but ______ didn’t help.
6. It is suggested ( ordered, required ... ) that ... It is suggested that the meeting _(s_h_o__u_ld__)_b_e__p_u_t_o__ff_(put off). It was ordered that we (_s_h_o__u_ld__) _a_r_ri(vaerrive) there in two hours.
= Not until she took off her dark glasses did I realize she was a famous film star.
3. It is clear ( obvious, true) that …
That he knows the answer is obvious. It is obvious that he knows the anwer.
English. ４．不强调谓语．
4．It was 8 o’clock____ it began to rain . A that B while C when D since
It is time that the children should go to bed.
高中英语语法专题复习 专题十五 it的用法教案
高中英语语法专题复习教案专题十五——it的用法一、考点聚焦1、it的基本用法（1）用作人称代词，代替前文提到过的事物。
The train has arrived. It arrived half an hour ago.（2）用以代替提示代词this, that。
—What’s this? —It’s a knife.—Whose watch is t hat? —It’s mine.（3）起指示代词的作用，指一个人或事物。
—Who is knocking at the door? —It’s me.（4）指环境情况等。
It was very noisy (quiet) at the very moment.（5）指时间、季节等。
—What time is it? —It’s eight o’clock.It often rains in summer here.（6）指距离。
It is a long way to the school.（7）作形式主语。
It is not easy to finish the work in two days.It is no use crying over spilt milk.It is as pity that you didn’t read the book.（8）作形式宾语。
I think it no use arguing with him.I found it very interesting to study English.He made it clear that he was not interested in that subject. （9）用于强调结构。
It was Xiaoming whom (that) I met in the street last night.It was in the street that I met Xiaoming last night.It ws last night that I met Xiaoming in the street.It was I who met Xiaoming in the street last night.2、含有“It is …”的句型（1）It is time (for sb.) to do sth.It is (high) time that sb. did sth.(虚拟语气)（2）It is + 形容词（+of / for sb.）+ to do sth.通常用of的词有brave、clever、car e ful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。
2023届高三体育单招英语一轮复习it的用法教案2
教学课题第二课时It Practice 授课日期2022.11.11 授课教师Sunny教学目标【知识目标】Important words:Make noise, under the tree, bring good luck, win the third prize, get through. Important sentences:1.This is the third prize she has won this year.2.Was it when you were talking with a friend under the tree that your bike was gone?3.Mary believed it was jut the license number that she had chosen that brought her good luck.【能力目标】To know the word it.【情感目标】（1）Use the words soundly according to their meanings.教学重难点重点: usages of it.难点：structure of the it.教学过程◆Step 1 Warming-up and revision(1) Small talk(2) Talk about the sentence structure that you’re familiar with, try to make sentences with the words.设计意图从活动引入，调动课堂气氛，引发学生学习兴趣◆Step 2 Introduction1.Ask Ss to look at the board and check the word to see if they know them.2.Show some examples of how the sentence work.教学过程◆Step 3 Presentation1.This is the third prize she ________ this year.A.winsB. wonC. is winningD. has won2.-Who is making so much noise in the garden? -________ the children.A.It isB. They areC. That isD. There are3.Was it when you were talking with a friend under the tree ________ your bike was gone?A.thatB. whereC. whichD. while4.Mary believed it was just the license number that she had chosen ______ brought her good luck.A.thatB. whichC. whenD. where5.It was at the gate ______ he told me the news.A.thatB. whatC. whichD. when6.Is ______ necessary to tell his father everything?A.itB. thatC. whatD. he7.Was it in this palace ______ the last emperor died?A.thatB. in whichC. in whereD. which8.Is _____ possible to fly to the moon in a spaceship?A.nowB. manC. thatD. it9.Was it during the Second World War _____ he died?A.thatB. whileC. in whichD. then10.Is ______ necessary to complete the design before National Day?A.thisB. thatC. itD. he11.I don’t think ______ possible to mas ter a foreign language without much memory work.A.thisB. thatC. itsD. it12.Does ______ matter if he can’t finish the job on time?A.thisB. thatC. heD. it13.It was not _____ she took off her dark glasses ________ I realized she was a famous film star.A.when; thatB. until; thatC. until; whenD. when; then14.Tom’s mother kept telling him that he should work harder, but _______ didn’t help.A.heB. whichC. sheD. it15._______ is a fact that English is being accepted as an international language.A.ThereB. ThisC. ThatD. It16.-I wonder if I could use your telephone. -_________.A.I wonder howB. I don’t knowC. Sorry, it’s out of orderD. No wonder, here it is17.It was about 600 years ago ______ the first clock with a face and an hour hand was made.A.thatB. untilC. beforeD. when18.It was _____ I reached there ______ I began to know something about the matter.A.until; whenB. until; thatC. not until; thatD. not when; that19.Let’s get through the work quickly. ____ seems to be little time left now.A.ItB. ThatC. ThereD. WeCheck answers together and try to discuss why you choose this option.◆Step 4Homework.1.Try to remember the usages of the it.2.Have more practice of the verbs and try to remember the words if you don’t know and take notes. 板书设计It Practice重点句型:1.This is the third prize she has won this year.2.Was it when you were talking with a friend under the tree that your bike was gone?3.Mary believed it was jut the license number that she had chosen that brought her good luck.教学反思通过单词it的练习，学生们能够了解其在实际练习中的用法，主要是用于强调、代词用于代替前文中或者后面出现的比较长的短语或者句子。
新课标高三英语一轮复习语法部分语法专项突破第7讲it的用法课件
8. — Who is knocking at the door? — He must be Martin. _____________________________________________________
4. (2012·课标全国，改错)I was happy when the toys worked, but when things went wrong, I got angry and broke it. _______________________________________________________
二、it 作形式主语与形式宾语 it 作形式主语常构成的句型 ①It be ＋ adj. ＋ for/of sb. to do sth. 此句型中当形容词 表示人的性格、脾气、特点等时，用介词 of，否则用 for。 It is hard for him to speak English fluently. ②It be ＋ n. ＋ for sb. to do sth. 用于此句型中的名词有 pity, shame, good manners, fun, joy, pleasure 等。 It is a pleasure for me to teach you in this semester.
realized this place was famous for not only its beauty but also its
weather. 10. (2016·天津)You are waiting at a wrong place. It is at the
广东高考英语一轮复习单元复习课件book6 u3it 的用法
It用法归类分析
用以表示时间、日期、距离、天气、气 候、季节、环境（Circumstance）等
5）It often rains heavily here.
climate
6）It’s spring now. 7）It’s quiet here.
Season Circumstance
It用法讲解课
制作:光明中学 张跃珍
It用法讲解课 制作:光明中学 张跃珍
改为强调句
It用法归类分析
Ex:把下列句子改为强调句：
1. Peter saw his friend in the park yesterday.
2. I didn’t receive my letter until yesterday?
4. Did it happen in 1980?
It用法讲解课 制作:光明中学 张跃珍
It用法归类分析
2) 代替动名词
eg: It’s no good standing here in the cold.
It’s helpless trying to convince her.
It doesn’t matter waiting a few more days.
A. it
B. that
C. these
D. them
A the harder you work, the better 2. ______ result you’ll get.
A. It’s believed that B. What we believed that
情况状态:用于指事情通常的情况或状态：
4. Did it happen in 1980?
5. Why does everyone think I’m narrowminded ?
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辽宁省抚顺县高级中学高考英语一轮复习《语法专项 it 用法》学案一、it作人称代词1．用来指代前文中提到的东西。
既可指代具体的东西，也可指代一种情况。
请看下面的例子1）I hear you bought a new bike，can you show it to me？2）If I can stop her coming to you，I shall do it．3）—I want to stay here for a night．—Your wife won't like it此时要注意与其他代词如that，one， those，this，another等的区别：1．I hear you bought a new bike，I want to buy _______ ，too．此处应填one，因为这里我并不是要买你的车，而是一辆新车，one ＝a new bike。
2．I have bought a new bike，but I still want to buy _______ ．此处应填another。
我已有了一辆，再买另一辆。
another ＝another new bike。
3．We see him when we come to town， but _______ isn't often．此处填that或it均可。
指代前面我们去城里时可以看到他这一情况。
4．My seat is next to _______ of the headmaster．此处应填that，用来代替名词seat，that＝the seat。
5．The bikes made this year are better than _______ made last years．此处应填those或the ones。
代替前文的bikes，因其是复数概念，故用those或the ones，those ／the ones＝the bikes。
2.也可以指动物Is this your dog？No, it isn’t.3用来指代人。
说明某人的身份或者做某事的人；指代婴儿或儿童；在不清楚某人性别时，也可使用it，尤其在问答的形式中更为常见。
例如：--Who is it? ---It’s me.Who is it there? It's I (me/you/he.....).I thought it was Mary, but it was not she.Her face lighted when she saw who it was.二、.非人称代词itit有时并不指具体的东西，而泛指天气、时间、日期、距离、价值、度量、温度、环境等，称为非人称的it：1.指天气：It is a lovely day, isn’t it?It is a bit windy.2.指时间: It was nearly midnight when she came back.3.指环境: It was very quiet in the café.4.指距离：It is half an hour’s walk to the city centre.5指日期：What's the date toda? It's the eleventh,October.6指季节：It is summer now.7指度量：It is about 20 pound/kg8.指价值：--- What's the cost of the dictionary?---It is sixty-three.9指温度It's 35 centigrade now. So I feel hot.三、用来泛指一般情况或在一些词组中出现，没有特殊含义，常不翻译。
1.It is my turn．轮到我了。
2．Let's call it a day．（今天就到这吧。
）3．Go ahead，we'll make it in the end．（继续干吧，我们最后会成功的。
）4．—I will study hard in the future．—That's it．（这就对了。
）5.How is it going?(情况怎样）四、作形式主语，替代不定式，ing形式或主语从句（一）．作形式主语替代主语从句1.①. 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 likea tree is very clear.②. 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.2.① It is said (reported/ learned/believed/thought/known/told/hoped.....) 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.该句型常可以转换成含有宾语从句的复合句或者含有不定式作主补的简单句。
例如：It's said that Tom has come back from abroad．→People say that Tom has come back from abroad．→He is said to have come back from abroad．②It is suggested ( ordered /demanded/insisted/commanded... ) 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.3.It is a pity ( a shame /an honour/a good thing/a fact,/a surprise/... ) 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！4. 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 enjoys pop songs very much．看来他非常喜欢流行歌曲。
该句型可转换成含不定式的简单句。
如上述两句可分别转换为：He happened to meet his teacher in the street.He seems to enjoy pop songs very much.5.it代替连接代词或连接副词引导的从句作形式主语（1）It is known（not decided，not made clear，found out，discussed，being discussed，being considered，a question，uncertain等）＋连接代词或连接副词引导的从句。
It is still a question when we shall have our sports meet．我们将什么时候举行运动会还是一个问题。
It is uncertain whether he can attend this conference or not．他能否来开会还不能确定。
（2）It doesn't matter（It's no wonder；It doesn't make too much difference等）＋连接代词或连接副词引导的从句。
It doesn't matter whether we go together or separately．我们一起去还是分开去都可以。
It is no wonder why he came here too late．他为什么来这么晚不足为怪(二)作形式主语替代不定式1. ①. 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。