高二英语课件 It的用法 人教.ppt

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1、2021/8/11 星期三1Its 10:08Its lovely It weighs only 3 kilosIts a large sum of money2021/8/11 星期三22.2.指时间指时间:It was nearly midnight when she came back.2.3.指环境指环境:It was very quiet in the caf.2.4.指距离：指距离：It is half an hours walk to the city centre.3.it的其他用法的其他用法3.1.表示谁在做某事的句子：表示谁在做某事的句子：Who is it?-Its me

2、.Her face lighted when she saw who it was.3.2.用来泛泛的指某件事：用来泛泛的指某件事：So you are going to be married this time？When is it？It doesnt matter.It is a shame,isnt it?2021/8/11 星期三3it可用来指代前文提到的人,物或事情,也可以用来指时间,金钱,距离,天气等自然现象基本用法基本用法:2021/8/11 星期三4 1.S+think +it +necessary +(for sb.)to do sth.The chairman though

3、t _ necessary to invite Professor Smith to speak at the meeting.(05全国)A.that B.it C.this D.himSentence patterns:B find possiblefeelimportant /clause形式宾语形式宾语2021/8/11 星期三5 2.S+V +it +ones duty +(for sb.)to do sth./clause 3.S +V+it +no good +doing sth.no use 形式宾语形式宾语I think it his duty to clean the bl

4、ackboard.Sentence patterns:a rulean honour 2021/8/11 星期三6 find possible1.S+think +it +necessary +(for sb.)to do sth./clause feel important Sentence patterns:Sentence patterns:形式宾语形式宾语 a rule2.S+V +it +ones duty +(for sb.)to do sth./clause an honour 3.S +V+it +no good +doing sth.no use 2021/8/11 星期三7

5、I like _ in the autumn when the weather is clear and bright.(04全国)A.this B.that C.it D.one点拨点拨:这是这是it it作形式宾语的一种特殊用法作形式宾语的一种特殊用法.少数动词少数动词(如如like,love,enjoy,dislike,hate,appreciatelike,love,enjoy,dislike,hate,appreciate等等)或或包含介词的动词短语包含介词的动词短语(如如see to,depend onsee to,depend on等等)后接宾后接宾语从句语从句,必须先由必须先由

6、it it担任形式宾语担任形式宾语,再接从句再接从句.1.I like(enjoy,hate)it when.2.I would appreciate it if3.see to(depend on)it thatSentence patterns:C形式宾语形式宾语2021/8/11 星期三81.It is necessary to be prepared for a job interview.Having the answers ready will be of great help.2.The Foreign Minister said,“It is our hope that the

7、 two sides will work towards peace.”3.It is known to everybody that the moon travels round the earth once every month.形式主语形式主语高考真题高考真题2021/8/11 星期三9 It is clear(obvious，true，possible，certain.)that.该句型中该句型中it 是形式主语，真正的主语是是形式主语，真正的主语是that 引引导的主语从句，常译为清楚（显然，真的，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肯定）是主语从句

8、最常见的一种结构。构。It is very clear that hes round and tall like a tree.=That hes round and tall like a tree is very clear.2021/8/11 星期三104.It is important(necessary，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，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（后的从句中要用虚拟语气（should+动词原形），动词原形），should 可以省去，建议记住该句型中

9、的形容词。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.5.It is said(reported，learned.)that.该句型中的该句型中的it 仍是形式主语，真正主语是仍是形式主语，真正主语是that 引导的主语引导的主语从句；该结构常译为据说（据报道，据悉）。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 re

10、ported that another earth satellite has been put into orbit.2021/8/11 星期三116.It 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，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（后的从句要用虚拟语气（should+动动词原形），词原形），should 可以省；常译为据建议；可以省；常译为据建议；有命令）有命令）It is sug

11、gested that the meeting(should)be put off.It was ordered that we(should)arrive there in two hours.2021/8/11 星期三127.It is a pity(a shame.)that.该句型中，该句型中，that后的从句一般用虚拟语气（后的从句一般用虚拟语气（should+动动词原形），词原形），should可省去表示出乎意料，常译为竟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。然。没有这种意义时，则不用虚拟语气。It is a pity that such a thing(

12、should)happen in your class.这种事竟然发生在你们班上，真是遗憾！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！他生病了，真遗憾！8.It is time(about time，high time)that.该句型中该句型中that 后的从句应该用虚拟语气，值得注意的是后的从句应该用虚拟语气，值得注意的是 常用过去时态表示虚拟常用过去时态表示虚拟 有时也用有时也用should+动词动词原形，原形，should 不能省，常译为是（正是）的时不能省，常译为是（正是）的时侯侯 It is time that c

13、hildren should go to bed.=It is time that children went to bed.2021/8/11 星期三139.It is the first(second.)time that.该句型要和上一个句型区别开来，该句型中的该句型要和上一个句型区别开来，该句型中的 that 从句从句不用虚拟语气，而用完成时态，。至于用什么完成时态，不用虚拟语气，而用完成时态，。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用从句用现在完成时态；如

14、果是一般过去时，后面从句则用过去完成时态，该结构中过去完成时态，该结构中 that 可以省去；可以省去；it有时用有时用 this 替换常译为是第一（二）次。替换常译为是第一（二）次。It is the first time I have been here.=This is the first time I have been here.10.It is.since.。该句型主要用作处理瞬间动词的完成时，又要和表示一段该句型主要用作处理瞬间动词的完成时，又要和表示一段时间的时间状语连用的问题，主句中是时间作表语，其时时间的时间状语连用的问题，主句中是时间作表语，其时态是现在时或完成时，态是现

15、在时或完成时，since 引导的从句通常是一般过去引导的从句通常是一般过去时态，而且是瞬间动词。如果主句是一般过去时，从句则时态，而且是瞬间动词。如果主句是一般过去时，从句则用过去完成时。用过去完成时。It is(has been)5 years since his father died.2021/8/11 星期三1411.It is.when.。该句型中的该句型中的 when 引导的是一个时间状语从句，主句中的引导的是一个时间状语从句，主句中的 it 指指时间，表语由具体的时间充当，常译为当的时候，是时间，表语由具体的时间充当，常译为当的时候，是 It was 5 oclock when

16、he came here.12.It be.before.该句型主句中的该句型主句中的 it 指时间，指时间，主句中的时态常是将来一般时或过主句中的时态常是将来一般时或过去时两种时态主句中的表语多是去时两种时态主句中的表语多是long，not long，3 days，2 weeks 等表示时间段的词或短语，常译为之后等表示时间段的词或短语，常译为之后。It was 3 days before he went to Beijing.It will be not long before he finishes his job.13.It happens(seems，appears)that.该句型

17、中该句型中it是形式主语，是形式主语，that 引导的是主语从句，主句中的引导的是主语从句，主句中的happen，seem等词是不及物动词。等词是不及物动词。It happened(so happened)that he met his teacher in the street.碰巧碰巧.It seems that he will be back in a few days.看来看来 2021/8/11 星期三1514.It takes sb.to do sth.该句型中的不定式是真正的主语，该句型中的不定式是真正的主语，it是形式主语，句是形式主语，句型中的直接宾语是时间，常译为做要花费某

18、型中的直接宾语是时间，常译为做要花费某人。人。It took thousands of people many years to build the Great Wall.15.It is no good(use)doing sth.该句型中的真正主语是动名词短语，主句中的表语可该句型中的真正主语是动名词短语，主句中的表语可以是以是no good，(not any good)，no use，(not any use)。It is no good learning English without speaking English.16.It doesnt matter whether(if).该

19、句型中该句型中whether(if)引导的从句是真正主语，该句引导的从句是真正主语，该句型常译为不论（是否）没关系。型常译为不论（是否）没关系。It doesnt matter if they are old.2021/8/11 星期三1617.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式的逻辑主语是由 of引起，主句中的形容词必引起，主句中的形容词必须是能表示逻辑主语特征的形容词。须是能表示逻辑主语特征的形容词。常见的有：常见的有：bad，brave，careless，clever，

20、cruel，foolish，good（好心的）（好心的），honest，horrible，kind，lazy，modest，naughty，nice（有教养的），（有教养的），polite，rude，silly，stupid，wise，wrong（错误的）等。（错误的）等。这个句型可以改写为：这个句型可以改写为：sb.is kind to do sth.。It is kind of you to say so.=You are kind to say so.2021/8/11 星期三1718.It is necessary(for sb.)to do sth.该句型与上一个同属一个句型，如果不

21、定式的逻该句型与上一个同属一个句型，如果不定式的逻辑主语是由辑主语是由for引起，主句中的形容词通常是表示引起，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况重要性，紧迫性，频繁程度，难易，安全等情况的形容词。的形容词。常见的形容词有：常见的形容词有：important，necessary，natural easy，safe，common，normal，hard，difficult，dangerous，unusual，rare，impossible，pleasant等。等。=在在中中的形容词作表语可以用从句改写，的形容词作表语可以用从句改写，如：如：It is import

22、ant for her to come to the party.=It is important that she(should)come to the party.2021/8/11 星期三18 possibleIt is/was +adj.necessary+(for sb.)to do sth./clause important ones duty It+is/was+n.ones hope +clause/(for sb.)to do sth.an honour saidIt is/was p.p.known +that-clause believed 形式主语形式主语2021/8/

23、11 星期三192021/8/11 星期三20It is the ability to do the job_ matters not where you come from or what you are.A.one B.that C.what D.itIt is/was+被强调的部分被强调的部分+that/who+句子其他成分句子其他成分强调句型强调句型高考真题高考真题2021/8/11 星期三21 It was _ back home after the experiment.A.not until midnight did he go B.until midnight that he

24、didnt go C.not until midnight that he went D.until midnight when he didnt go In which play is _ your brother appears?A.that where B.this when C.it that D.it where It was in the lab _ was taken charge of by Professor Zhang _ they did the experiment.A.where;that B.which;where C.that;where D.which;that

25、强调句型强调句型被强调的部被强调的部分是分是not until引导的时间引导的时间 状语状语?强调句型用于疑强调句型用于疑问句问句,被强调的被强调的部分是特殊疑问部分是特殊疑问词或从句引导词词或从句引导词?In which play is it that?It is thatIs it that?I dont know in which play it is that强调句型和强调句型和各种从句各种从句高考热点高考热点?2021/8/11 星期三222021/8/11 星期三231.The Parkers bought a new house but _ will need a lot of

26、work before they can move in.2.A.they B.it C.one D.which3.2.Weve been looking at houses but havent found _ we like yet.4.A.one B.ones C.it D.them5.3.Im moving to the countryside because the air there is much fresher than _ in the city.6.A.ones B.one C.that D.those易误辨析易误辨析:it/one/thatBACthe house tha

27、t the Parkers boughta housethe air2021/8/11 星期三241.Its years _(since,before,after,that)I painted this beautiful picture.2.It will be years _(since,before,after,that)I paint this beautiful picture.3.It was years _(since,before,after,that)I painted this beautiful picture.4.Its for years _(since,before

28、,after,that)I have painted this beautiful picture.易误辨析易误辨析:表示从表示从since since 从句谓语动作发生以后到现在所经过的一从句谓语动作发生以后到现在所经过的一段时间，译为段时间，译为“自从自从.以来已多久了以来已多久了”It is+时间段时间段+since(过去时过去时).表示从过去某一时间到表示从过去某一时间到beforebefore从句谓语动作发生所经过从句谓语动作发生所经过的一段时间的一段时间,译为译为“多长时间后才多长时间后才/就做了就做了”It+was+时间段时间段+before(过去时过去时)表示从现在起到表示从现

29、在起到beforebefore从句谓语动作发生所经过的一段从句谓语动作发生所经过的一段时间时间,译为译为“多长时间后才会多长时间后才会/就会做就会做”It+will be+时间段时间段+before(一般现在时一般现在时)_2021/8/11 星期三25Translate the following:1.过了很久他才回来.2.2.我们很久后才会见面的.3.3.我离开这所学校已经很久了.It was long before he came back.It will be long before we meet again.It is long since I left this school.I

30、t is+时间段时间段+since(过去时过去时).It+will be+时间段时间段+before(一般现在时一般现在时)It+was+时间段时间段+before(过去时过去时)易误辨析易误辨析:2021/8/11 星期三26 Do you want to live another 100 years or more?Some experts say that scientific advances will one day enable humans to last tens of years beyond what is now seen as the natural limit of

31、the human life span There is a great push so that people can live from 120 to 180 years,”he said.“Some have suggested that there is no limit and that people could live to 200 or 300 or 500 years.”However,many scientists who specialize in ageing are doubtful about it.(04全国D)The underlined“it”refers t

32、o _ A.a great push B.the idea of living beyond the present life span C.the idea of living from 200 to 300 years D.the conservative estimateReading comprehensionReading comprehension2021/8/11 星期三272021/8/11 星期三281.If I can help _,I dont like working late into the night.A.so B.that C.it D.them2.As the

33、 busiest woman in Norton,she made _ her duty to look after all the other peoples affairs in that town.A.this B.that C.one D.it3.Id appreciate _ if you would like to teach me how to use the computer.A.that B.it C.this D.you4._ is our belief that improvements in health care will lead to a stronger,mor

34、e prosperous economy.A.As B.That C.This D.It2021/8/11 星期三295.I just wonder _ that makes him so excited.A.why it does B.what he does C.how it is D.what it is6.Catherine bought a postcard of the place she was visiting,addressed _ to _ and then posted it at the nearby post office.A.it;her B.it;herself

35、C.herself;her D.herself;herself7.Its already 10 oclock I wonder how it _ that she was two hours late on such a short trip.A.came over B.came out C.came about D.came up2021/8/11 星期三302021/8/11 星期三31The Usage of“it”基本用法常见用法特殊用法三个考点三个句型三个句型三个替代词三个it 后接时间段的句型易误辨析强调句型形式主语形式宾语Summary2021/8/11 星期三321.Collect as many phrases and the sentence patterns including“it”as you can.2.Finish the exercises on your piece of paper.2021/8/11 星期三33Thank youThank you2021/8/11 星期三34