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Section_ⅢGrammar—it的用法(1)语法图解探究发现①It is a beautiful day here and I am sitting under the big tree at the end of the garden.②Your mother tells me that you started smoking some time ago and now you are finding it difficult to give it up.③It is never too late to mend.④It is no use talking to them.⑤It is said that he stole the money.⑥I think it difficult to learn English well.⑦We make it clear that speaking to the teacher in that way is not polite.⑧I don't like it when people talk with the mouth full of food.[我的发现](1)①句it表示天气，②句第一个it代替to_give_it_up作形式宾语；第二个it代替句中所说的“吸烟”的事。
(2)在句③④⑤中it用作形式主语，其中句③用在“It is＋形容词＋(for/of＋sb.)＋动词不定式(短语)”中，it指代动词不定式(短语)；句④用在“It is＋no use/good＋动名词(短语)”中，it指代动名词(短语)；句⑤用在“It is＋said/believed/reported＋that从句”中，it指代that 从句。
(3)在句⑥⑦⑧中it用作形式宾语，其中句⑥用在“动词＋it＋形容词＋动词不定式(短语)”中，it指代动词不定式(短语)，句⑦用在“动词＋it＋形容词＋that从句”中，指代that 从句；句⑧it用在某些特殊的句式中，指代when从句。
Unit3 单元语法详解“it”的用法一、代词it1. 代替前文提到的事物。
如：——Where is the dog?-It's in the bedroom. ——狗在哪?——在卧室里。
2. 指性别不明的婴儿或不明确身份的人。
如：There is a knock on the door. It must be the postman.有人在敲门，一定是邮递员。
3. 代替指示代词this，that。
如：——What's this?——It's a new machine. ——这是什么？——是一种新机器。
二、it 用于某些句型It's time for sth. 该做某事了It's time to do sth. 该做某事的时候了It's time for sb. to do sth. 是某人该做某事的时候了It's(about/high）time+that从句某人该做某事了（从句谓语用一般过去时）It's the first(second)time+that从句某人第几次做某事（从句谓语用现在完成时）It's+时间段+since从句自从……有多长时间了It will be/was+时间段+before从句过多长时间才……(1）It is the first time that I have been here.这是我第一次来这儿。
(2）It is three years since the war broke out.自战争爆发以来有三年了。
(3）It will be half a year before I come back.还得再过半年我才能回来。
三、it用作形式主语当不定式、动名词、从句等复杂成分用作句子主语时，为保持句子平衡，通常把真正的主语后置，而在句首使用形式主语t。
如：(1）It's unknown when he will come.他什么时候来还不知道。
高中英语学习资料madeofjingetiejiGRAMMAR“it”的用法（一）【概括】it的用法好多，本单元我们主要学习它的基本用法以及它作形式主语或形式宾语的用法。
1.用作人称代词，指代上文提到的事物、动物、性别不明或没必需知道性其他人。
如：“Where’syourcar?”“It’sinthegarage.”Herdogwashowlingatthedoor,soheletitin.Thebabynextdoorkeptmeawake.Itcriedallnight.用作非人称代词，用来指代时间、日期、地址、天气、温度、距离、环境、状况等。
如：Itwas4o ’clockandthemailstillhadn’tcome.It’squitewarmatthemoment.It’sover200milesfromLondontoManchester.It’sgettingverycompetitiveinthecarindustry.3.用作形式主语，真实的主语常为不定式（短语）、动词-ing形式（短语）或名词性从句。
如：It’s impossibleforustogetthereintime.It’salwayssadsayinggoodbyetosomeoneyoulove.It’sstrangethatshenevermentionedthewedding.4.用作形式宾语，真实的宾语常为不定式（短语）、动词-ing形式（短语）或名词性从句。
如：Manypeoplefindithardtostopsmoking.Shefindsitboringstaying/tostayathome.Ifinditstrangethatshedoesn ’twanttotravel.【辨析】it,one和that1.it指物时，是明确指上文提到的那个事物。
it能够取代单数可数名词、不行数名词及前方提到的事情或状况。
第三部分：语法---It的用法【学习目标】知识目标：学习代词it的各种用法。
能力目标：能熟练运用到各种场合，能够解答与之相关的习题，学会使用it有关的高级句型尤其是强调句型、it作形式主语。
【课前自学】代词的用法：一、作人称代词1、it代替前面（或后面）的单数名词或分句等所表示的事物。
e.g. You cannot eat your cake but have it.（it代替前面的_________）Although we cannot see it, there is air all around us. （it代替后面的_________）They say he has left town, but I don’t believe it.（it代替前面_________）2、代替有生命但不能或不必分阴阳性的东西（包括婴儿）。
e.g. Yesterday we saw a big tree. It was fully twenty metres high. （it代替前面的_______）The baby cried because it was hungry. （it代替前面的_________）3、在某些习惯说法中，可以代替人。
e.g. ---- Someone is knocking at the door, Peter.---- Who is _________? ---- _________ me.---- Who are singing? ---- It is the children.---- The light is still on in the lab. It must be the third-year students doing the experiment.4、it与one的区别：这两个词都可以代表前面说过的名词，但it用于同名同物的场合；one则用于同名异物的场合。
人教版高中选修六第三单元语法it的用法(1)人教版高中英语选修六的语法武汉市新洲区新洲二中英语组张元利人教版高中英语选修六的语法It’s 10:08 It weighs only 3 kilosIt’s lovely It’s a large sum of money人教版高中英语选修六的语法It was a sunny day. Jack wanted to make an ____ appointment with Rose. They decided to go for a it was two miles walk to the park, though _____ It was comfortable to walk on the street. away. ___人教版高中英语选修六的语法it it Suddenly ___began to rain. They found __ hard to walk there. Then they took a bus home. Unfortunately ___ it went wrong. When they got home, they were wet through. Thus ___ it was a day that they would never forget. 人教版高中英语选修六的语法学习纲要The Usage 形式主语 of 形式宾语“it” 固定用法基本用法三个句型常见用法特殊用法三个句型人教版高中英语选修六的语法1.基本用法:1.it作人称代词1.1.it的最基本用法是作人称代词，主要指刚提到的事物，以避免重复: 1.2.也可以指动物或婴儿(未知性别的婴儿或孩子): 1.3.也可指抽象事物:人教版高中英语选修六的语法1.基本用法:2.非人称代词it2.1.指天气：2.2.指时间:2.3.指环境:3.作指示代词:可用来代替this ,that.BACK人教版高中英语选修六的语法学习大纲that 从句——虚拟语气… possible It is / was + adj. necessar y + ( for sb. ) to do sth. / clause 逻辑主语的特性important (of sb.) … … that 从句——虚拟语气 one’s duty It +is /was + n. a pity + ( for sb. ) to do sth. / that an honour … … said/reported/noticed It is / was p.p + that-clause suggested/ordered that 从句——虚拟语气…2. it 用作形式主语人教版高中英语选修六的语法2. it 用作形式主语2.1 作形式主语替代不定式1). It takes sb. ... to do sth. ;做...要花费某人..;2). It is kind ( of sb. ) to do sth.3). It is necessary ( for sb. ) to do sth4).It +is /was + a pity ( for sb. ) to do sth.人教版高中英语选修六的语法2. it 用作形式主语2.2.作形式主语替代ing形式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 ),no fun, useless,a waste of time d+doing sth.It is no good learning English without speaking English.人教版高中英语选修六的语法2. it 用作形式主语2.3 代替主语从句 1)It is + adj. +that从句① It is clear ( obvio us,true,possible,certain....) that .....“清楚(显然，真的，肯定...)” ②. It is important ( necessary,right,strange,natural...) that ...人教版高中英语选修六的语法2. it 用作形式主语2)It is +v-ed +that 从句① It is said (reported, learned....) that ... 据说(据报道，据悉...)“。
Section_ⅢGrammar—it的用法(1)语法图解探究发现①It is a beautiful day here and I am sitting under the big tree at the end of the garden.②Your mother tells me that you started smoking some time ago and now you are finding it difficult to give it up.③It is never too late to mend.④It is no use talking to them.⑤It is said that he stole the money.⑥I think it difficult to learn English well.⑦We make it clear that speaking to the teacher in that way is not polite.⑧I don't like it when people talk with the mouth full of food.[我的发现](1)①句it表示天气，②句第一个it代替to_give_it_up作形式宾语；第二个it代替句中所说的“吸烟”的事。
(2)在句③④⑤中it用作形式主语，其中句③用在“It is＋形容词＋(for/of＋sb.)＋动词不定式(短语)”中，it指代动词不定式(短语)；句④用在“It is＋no use/good＋动名词(短语)”中，it指代动名词(短语)；句⑤用在“It is＋said/believed/reported＋that从句”中，it指代that 从句。
(3)在句⑥⑦⑧中it用作形式宾语，其中句⑥用在“动词＋it＋形容词＋动词不定式(短语)”中，it指代动词不定式(短语)，句⑦用在“动词＋it＋形容词＋that从句”中，指代that 从句；句⑧it用在某些特殊的句式中，指代when从句。
高二英语选修6Unit3语法项目It的用法讲解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。
1．(NMET98) It was only when I reread his poems recently ___ I began to appreciate their beauty．A．until B．that C．then D．so正确答案：B 此题考查强调句，所以用that。
2．(NMET98) I hate____when people talk with their mouths full．A．it B．that C．these D．them正确答案：A 此题考查it作形式宾语的用法，所以选A。
3．(MET91，短文改错)David and I did not agree and David pointed to a path which he thought it would probably lead to a village．正确答案：去掉it，因为定语从句中已有宾语which。
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：① It 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…。
It was clear that they had no desire for peace.③ It seems (happened ,turned out,etc.)that…It seemed that things were not as they expected.④ It is said ( decided ,expected ,etc)that …It is said that the tickets have been sold out .4.用作形式宾语。
当复合宾语中的宾语是不定式,－ing短语或从句往往用it作形式宾语,而将真正的宾语移至句末,句子重心后移。
1) We find it difficult to learn English well in such a short time．2) We think it no use crying over spilt milk．3) We made it clear when and where we were going to have the meeting．5．用于强调句型，即“It is/was＋被强调部分＋that/who/whom+其它”句型之中。
使用该句型有以下几点请注意：①强调句的谓语is或was永远用单数.It was yesterday that I met your father in the street．②不管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 was in the street that I met your father yesterday．③被强调部分为人时，可用who(主格或宾格)和whom(宾格)代替that，用that也行。
1)It was your father that/whom /who I met in the street yesterday．2) It was I that/who met your father in the street yesterday．④强调句中也要注意主谓一致、人称一致和否定转移的问题。
1)It is they who are our friends．2) It was not until ten o'clock that we got home last night．⑤注意不要混淆强调句和其他从句。
It is was…that…为强调句标志，去掉后仍可组成一个完整的句子，只是没被强调,而其他从句一般不具备这一特征。
比较：1) It was ten o'clock when we got home last night．我们昨晚到家时已十点了。
2) It was at ten o'clock that we got home last night．我们昨晚是在十点到家的。
第一句不是强调句，when不可改为that,因为去掉it was和that后，只能组成“We got home ten o'clock last night．”这样一个不完整的句子；第二句是强调句，that不可改为when．二、常用句型及考点I. 形式主语型1. It is clear (obvious，true，possible，certain…) that…2. It is important (necessary，right，strange，natural…)that…掌握本句型，应该记住所列举的形容词，并且记住that后的从句应用虚拟语气(should+动词原形)，should可以省去。
3. It is no good (use) doing sth．4. It is a pity (a shame …) that…本句型中，that后的从句一般用虚拟语气 (should十动词原形)，should可以省去。
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。
5. It is time (about time，high time) that…本句型中that后的从句应该用虚拟语气。
6. It is the first (second…)time that…7. It is said (reported，learned…．)that…8. It is suggested (ordered…) that…本句型中的过去分词应该是表示请求、建议、命令等的词，that后的从句要用虚拟语气(should十动词原形)，should可以省略。
常译为“据建议；有命令……”。
9. It happens (seems，appears) that…10. It takes sb…to do sth．11. It doesn’t matter whether…12. It is kind (of sb) to do sth．本句型中的不定式如果需要逻辑主语，则须要前置介词of，而句型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，honest，horrible，kind，lazy，modest，naughty, polite，rude，silly, stupid，wise，wrong等。
13. It is necessary ( for sb) to do sth．14. It is (just) like sb to do sth．本句型为“某人(恰恰)是……样子”。
用来表示赞扬或不满，若用否定式，则表示怀疑。
例：It's like him to leave the work to others．他就是这样的一个人，把工作推给别人。
15. It is up to sb to do sth．本句型表示“谊由某人做……”。
II．强调句型It is+ 被强调部分+that/who…本句型中被强调部分可以是主语、宾语或状语。
强调的主语如果是人，that可以由who换用。
III．其他句型1. It is…since…本句型主句中用时间作表语，一般用现在时或完成时，since引导的从句常用瞬间动词的一般过去时态。
主句如用一般过去时，则从句用过去完成时。
2. It is…when…本句型中的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。
3. It looks (seems) as if．．．本句型中的as if引导一个状语从句，常译为“看起来好像……”。
如果与事实不相符合，则用虚拟语气．例1 It looks as if he is ill (真的病了) .例2 It looks as if he were ill (没有生病) .Exercises:一．单项选择1.It was at the gate ____ he told me the news.A. thatB. whatC. whichD. when2.Is ____necessary to tell his father everythingA. itB. thatC. whatD. he3.Was it in this palace ____ the last emperor died?A. thatB. in whichC. in whereD. which4.Is ____ possible to fly to the moon in a spaceship?A. nowB. manC. thatD. it5.Was it during the Second World War ____he died?A. thatB. whileC. in whichD. then6.Is ____necessary to complete the design before National Day?A. thisB. thatC. itD. he7.I don't think ____possible to master a foreign language without much memory work.A. thisB. thatC. itsD. it8.Does ____matter if he can't finish the job on time?A. thisB. thatC. heD. it9.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; then10.Tom‘s mother kept telling him that he should work harder, but ____didn’t help.A. heB. whichC. sheD. it11.____is a fact that English is being accepted as an international language.A. ThereB. ThisC. ThatD. It12. Is ________ possible to fly to the moon in a spaceship?A．now B．man C．that D．it13．Our food and service are better than ________ used to be.A．it B．we C．they D．them14．________ appears to me ________ the report must be truth.A．That; it B．It; that C．It; it D．That; that15．He feels ________ duty to help others.A．that he B．that his C．it he D．it his16．Take ________ easy. The roads are icy.A．it B．them C．us D．you17．The TV sets made in China are much better than ________ in Japan. A．that B．those C．them D．It18．—— Have you found the bike you lost yesterday?—— Yes, I've found ________ already.A．it B．that C．the one D．that one19.—— I'm looking for a flat.—— Would you like ____ with ____ garden?A．it; the B．it; a C．one; a D．one; the20．________ was ________ who I met in the museum this morning.A．It; him B．It; he C．That; he D. That; him21．It was in the rice fields ________ we had our League meeting. A．where B．that C．in which D．on which22．________ you come to the party so late?A．Why is it B．Why it isC．Why it is that D．Why is it that23．—— Were all three people in the car injured in the accident—— No, ___ only the two passengers ___ got hurt．A．they were; that B．there was; thatC．it was; who D．there are; who24．I don' t think ________ possible to master a foreign language without much memory work .A．this B．that C．its D．it25．It was not ________ she took off her glasses ________ I realized she was a famous film star．A. when; thatB. until; thatC. until; whenD. when; then26.It was not until 1920 ____ regular radio broadcasts began.A．while B．which C．that D．since27．________ is a fact that English is being accepted as an international language.A．There B．This C．That D．It28．It was about 600 years ago ________ the first clock with a face and an hour hand was made.A．that B．until C．before D．when29．It was only when I reread his poems recently ____ I began to appreciate their beauty.A．until B．that C．then D．So30．I hate ______ when people talk with their mouths full.A．it B．that C．these D．them31．—— Why don't we take a little break? —— Didn't we just have ________ ?A．it B．that C．one D．this32.Was it during the Second World War ____ he died？(MET88)A．that B．While C．in which D．Then33.Is ____ possible to fly to the moon in a spaceship？(MET88)A．now B．that C．it D．Man34.I don't think ___ possible to master a foreign language without much momory work．(MET90)A．This B．that C．its D．It35.___ is a fact that English is being accepted as an international language．(NMET95)A．There B．This C．That D．It36.It was about 600 years ago ___ the first clock with face and an hour hand was made． (NMET97)A．that B．until C．before D．when37.____computers play such an important part in our daily life?A．Why it is that B．Why is it thatC．Why was it that D．Why is it38. Was it during the Second World War _____he died?A. thatB. whileC. in whichD.then39. Is ____ necessary to take off our shoes when we enter the lab?A. everyoneB.thisC.herD.it40. Is ____ possible to fly to the moon in a spaceship?A.nowB.thatC.itD.man41. I d on’t think ___ possible to master a foreign language without much memory work.A.thisB.thatC.itsD.it42. She heard of a terrible noise, ___ brought her heart into her mouth.A.itB.whichC.thisD.that43. Alice received an invitation from her boss, ____ came as a surprise.A.itB.thatC.whichD.he44. Does ____ matter if he can’t finish the job on time?A.thisB.thatC.heD.it45.Tom’s mother kept telling him that he should work harder,but ____ didn’t help.A.heB.whichC.sheD.it46.The weather turned out to be very good, ___ was more than we could expect.A.whatB.whichC.thatD.it47.____is a fact that English is being accepted as an international language.A.ThereB.ThisC.ThatD.It48.I hope there are enough glasses for each guest to have _____.A.itB.thoseC.themD.one49.It was about 600 years ago___the first clock with a face and an hour hand was made.A.thatB.untilC.beforeD.when50.I hate ____ when people talk with their mouths full.A.itB.thatC.theseD.them51.It was only when I reread his poems recently____ I began to appreciate their beauty.A.untilB.thatC.thenD.so52.It is the ability to do the job ____ matters not where you come from or what you are.A.oneB.thatC.whatD.it53.It ____ you that ____ to blame.A.is;isB.is; areC.are;areD.are;is54.Was_____that I saw last night at the concert?A.it youB.not youC.youD.that you55.____ electricity plays such an important part in our life?A.Why is it thatB.Why is itC.Why it is thatD.Why is that56.It was ____ he said _____ disappointed me.A.what;whatB.that;thatC.what;thatD.that;what57.It was in the lab ___ was taken charge of by Professor Harris ___ they did the experiment.A.which; thatB.that; whatC.whom; thatD.which; where58.Many people now make a rule to buy cards for their friends before Christmas.A.themselvesB.itC.thatD.this59.Someone is at the door, who is ?A.thisB.thatC.itD.he60.—It is raining cats and dogs.— .A.So it isB.So is itC.Neither it isD.Neither is it二.分析it成分，辨清相似句型。
