高考英语 语法专题 It的用法课件 新人教.ppt

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1、 It is never too old to learn.It is easier to fall than to rise.It is no use crying over spilt(溢出的溢出的)milk.It never rains but it pours(泼水泼水).Proverbs(谚语谚语)with“It”活到老活到老,学到老。学到老。摔倒容易爬起来难。摔倒容易爬起来难。覆水难收。覆水难收。不鸣则已不鸣则已,一鸣惊人。一鸣惊人。2021/8/11 星期三1 It is easy to open a shop but hard to keep it always open.It

2、 takes three generations(代代)to make a gentleman.创业容易守业难。创业容易守业难。十年树木，百年树人。十年树木，百年树人。2021/8/11 星期三2Grammar:Use of “It”2021/8/11 星期三32022/11/28 课文原句再现课文原句再现1.Its a beautiful day here and I am sitting under the big tree at the end of the garden.2.Your mother tells me that you started smoking some time

3、ago and now you are finding it difficult to give it up.3.Believe me,I know how easy it is to begin smoking and how tough it is to stop.2021/8/11 星期三4The use of“it”1.用作人称代词，代表前面提到的人或事物。用作人称代词，代表前面提到的人或事物。1)Whos it?_me.2)Look at the picture._is a picture of our school.ItsIt 2.用于代替指示代词用于代替指示代词this 和和th

4、at。-Is this jacket yours?-Yes,_is.it2021/8/11 星期三5Read and analyze the following sentences.It is Friday today.It was very cold last Monday.It is about 8:30 now.It is about 25km from Longxian to Bazi.It lies in the south of Shaoguan city.It is 40C!You got a high fever!Question:What does“it”in these s

5、entences refer to?Conclusion:it 可以用作可以用作非人称代词非人称代词，表示，表示_,_,_,_,_,_等。等。DateweathertimedistanceplaceTemperature 日期日期天气天气时间时间距离距离地点地点温度温度2021/8/11 星期三6e.g:_ a.Jim is at the door_wants to see you b.Someone is at the door_must be Jim A.That,It B.It,He C.He,It D.Who,He一般说来，在指代身份或性别明确的人时，通一般说来，在指代身份或性别明确的

6、人时，通常要根据情况用代词常要根据情况用代词heshe；若是指代身份；若是指代身份或性别不明的人，则用代词或性别不明的人，则用代词itBackC2021/8/11 星期三71.I cant find my pen.Im going to buy _.2.Life today is better than _ in the old days.3.I cant find my pen.I must have lost _._用来指代前面提到的可数名词，所指的是事物本身；用来指代前面提到的可数名词，所指的是事物本身；_则用来替代前面出现过的可数名词，泛指，指一类则用来替代前面出现过的可数名词，泛指，

7、指一类事物中的一个事物中的一个 a+na+n；_用来代替不可数名词或单数可数名词，特指。用来代替不可数名词或单数可数名词，特指。onethatit itonethat2021/8/11 星期三8一一.It 作为形式主语作为形式主语 当不定式、动名词、从句等用作句子主当不定式、动名词、从句等用作句子主语时，为保持句子平衡，通常把真正的主语语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语放在句末，而在句首使用形式主语it.2021/8/11 星期三92022/11/28eg:1.It is illegal（for a teenager）to drive a car withou

8、t a license.2.It is necessary for you to give him a letter.3.思考：在句思考：在句1和句和句2中中 it 的作用是的作用是_,真正主语是真正主语是_。形式主语形式主语不定式短语不定式短语（1）It+be+adj.+（for sb.）to do sth.此处此处adj.通常为描述通常为描述事件事件的形容词：的形容词：easy，difficult，hard，necessary，impossible，likely，right，wrong，important，polite，obvious，useful，useless，dangerous202

9、1/8/11 星期三102022/11/28（2）It+be+adj+of sb.to do sth此处此处adj.通常为描述通常为描述人人的形容词：的形容词：kind，unkind，nice，rude，cruel，considerate，careless，foolish，stupid，wise，crazy.eg:1.Its kind of you to help me with the problem.某人做某事某人是某人做某事某人是.2 Its foolish of you to quit your job now.2021/8/11 星期三112022/11/283.It is no g

10、ood crying over spilt milk.4.It is no use casting pearls before swine.在句在句3与句与句4中，中，it的作用是的作用是_,真正主语真正主语是是_.形式主语形式主语动名词短语动名词短语构成如下结构：构成如下结构：It is+no use/no good/not any good/not any use+doing sth.2021/8/11 星期三12Read and analyze the following sentences.It is obvious that the water was to blame.Is it

11、possible that he will become the chairman of our country?It is amazing that at my age I still look like a student!分析：分析：it是是_ ,句子真正的主语是句子真正的主语是_形式主语形式主语thatthat引导的主语从句引导的主语从句总结：总结：It is+_+that从句从句adj.2021/8/11 星期三13跟踪训练跟踪训练1：It is+adj.+that从句从句很明显他已经知道了那个坏消息。姚明篮球比易建联打得好是肯定的。It is obvious that he has

12、 known the bad news.It is certain that Yaoming plays basketball better than Yijianlian.2021/8/11 星期三14It is said that 据说据说 It is reported that It is supposed that It is hoped that It is well known that 据报导据报导据推测据推测希望希望众所周知众所周知普遍认为普遍认为有人建议有人建议It is said(reported.)that.It is suggested thatIt is genera

13、lly considered that该句型中的该句型中的it it 仍是形式主语，真正主语是仍是形式主语，真正主语是thatthat引导的主语从句。引导的主语从句。2021/8/11 星期三15 1.1.吸烟危害健康，这是事实。吸烟危害健康，这是事实。2.2.碰巧我们在同一间大学碰巧我们在同一间大学 。3.3.据说日本发生了地震。据说日本发生了地震。4.4.有人建议他应该立刻戒烟。有人建议他应该立刻戒烟。It is a fact that smoking does harm to health.It happens that we are in the same college._ ther

14、e is an earthquake in Japan.It is said that_ he should quit smoking at once.It is suggested that2021/8/11 星期三16二、二、it作形式宾语作形式宾语2021/8/11 星期三171.I found it very interesting to study English.我发现学英语非常有趣。我发现学英语非常有趣。2.I think it no use arguing with him.我认为和他争吵没有用。我认为和他争吵没有用。3.He made it clear that he was

15、 not interested in this subject.他非常清楚地表示他对那门学科不感兴趣。他非常清楚地表示他对那门学科不感兴趣。小结：it在句中充当_，真正宾语可以由_ 以及_短语充当。还可以由_引导的宾语从句充当。不定式不定式动名词动名词that形式宾语形式宾语2021/8/11 星期三18 总结：总结：当复合宾语中的宾语是不定式、动名当复合宾语中的宾语是不定式、动名词宾语从句时词宾语从句时,往往把宾语放在它的补足语往往把宾语放在它的补足语后面，而用后面，而用it 作形式宾语作形式宾语,放在宾语补足语之放在宾语补足语之前。前。该句型中的该句型中的it 作形式宾语作形式宾语,常用的

16、动词有常用的动词有think,believe,make,find,consider,feel等。等。2021/8/11 星期三19六、用于强调句型中六、用于强调句型中It+be+被强调部分被强调部分+that/who(a person)从句从句I met Tom in the park yesterday.1)It was I who met Tom in the park yesterday.2)It was Tom who I met in the park yesterday.3)It was in the park that I met Tom yesterday.4)It was y

17、esterday that I met Tom in the park.It was five oclock _ I got home.It was at five oclock _ I got home.whenthat（Q？上面的句子分别强调句子的哪个成分。）？上面的句子分别强调句子的哪个成分。）2021/8/11 星期三20强调句型的判断强调句型的判断将将“It is/was that/who”结构去掉，剩下的部结构去掉，剩下的部分能构成一个完整的句子便是强调句。分能构成一个完整的句子便是强调句。1)It was the street _ I met an old friend of m

18、ine yesterday.A.that B.where C.which D.whatB.2)It was in the street _ I met an old friend of mine yesterday.3)It was at 6:00 _we had our supper yesterday evening.4)It was 6:00 _we had our supper yesterday evening.B A thatwhen2021/8/11 星期三21It is not until+被强调部分被强调部分+that.该句型也是强调句型。主要用于强凋时间状语该句型也是强调句

19、型。主要用于强凋时间状语,译成汉语译成汉语“直到直到才才”,可以说是可以说是not.until.的强调形式。如的强调形式。如:It was not until she took off her dark glasses that I realized she was a famous film star.=_ she took off her dark glasses _I realize she was a famous film star.=I _realize she was a famous film star _ she took off her dark glasses.Not u

20、ntildiddidntuntil2021/8/11 星期三22在一些固定用法中考查在一些固定用法中考查常见的固定用法有常见的固定用法有:make itforget itbelieve it or not Dont mention it It doesnt matter It(That)depends You guessed it Its hard to sayIts up to you to do sth.take it/things easy成功，做到，赶上等成功，做到，赶上等别提了，忘了它吧别提了，忘了它吧信不信由你信不信由你别提了，表示不用谢别提了，表示不用谢没关系没关系视情况而定视情

21、况而定你猜对了你猜对了很难说很难说 由你来决定做某事由你来决定做某事不要慌，别担心，沉住气不要慌，别担心，沉住气2021/8/11 星期三23改错改错1.You wont find difficult to get to the city 2.center.(2004全国全国)2.I know there is not easy to be a teacher.(2004湖北湖北)3.This is not surprising that the Silver Ghost was regarded as“the best car in the world”.find后加后加itthere it

22、This It2021/8/11 星期三24Rewrite the sentences using an“it”structure.1 Giving up smoking is difficult.(It is)2 Most people believe smoking causes cancer.(It is believe that)3 Dont try to quit on a stressful day.(Its no use)4 you could suffer from bad health if you keep smoking.(It is likely that)It is

23、difficult to give up smoking.It is believed that smoking causes cancer.It is no use trying to quit on s a stressful day.It is likely that you could suffer from bad health if you keep smoking.2021/8/11 星期三25 One midnight,was raining heavily.Mary was lying in bed.She couldnt fall sleep.Suddenly,she he

24、ard someone knocking at the door.“Who is?”She asked.She looked at the clock hung on the wall.was striking two.“is me.”One man answered.“was impossible for him to appear here.”she thought.“John?Is_ you?”“Yeah!is me”the man answered.She rushed to open the door.John was just standing in front of her.He

25、 said to Mary excitedly,“I missed the plane.was said that the plane I would take crashed down three hours ago.It was in that plane I should have gone to New York.After this,I think clearly that I love you so much I want to be marry you.”ititItItItItItit thatthat/whichthatthatFill in the blanks2021/8

26、/11 星期三26Translation1.是到戒烟的时候了。是到戒烟的时候了。(quit)It is time to quit smoking.2.让人惊讶的是在我这个年纪我依然让人惊讶的是在我这个年纪我依然 这么健康。这么健康。(It is amazing that.)It is amazing that at my age I am still so fit.2021/8/11 星期三27It is a little difficult for adolescents to become accustomed to a new enviroment.3.一旦你吸烟上了瘾一旦你吸烟上了瘾,

27、你会发现要把它戒掉你会发现要把它戒掉 很难。很难。(addict.to;tough)Once you are addicted to smoking,you will find it tough to give it up.4.青少年要适应新的环境有点难。青少年要适应新的环境有点难。(adolescent;accustom.to)2021/8/11 星期三28it代词代词人称代词人称代词指示代词指示代词非人称代词非人称代词引导词引导词it 用在强调句中用在强调句中 it 用作形式主语用作形式主语it 用作形式宾语用作形式宾语小结：2021/8/11 星期三29Homework1.Finish the exercises on page 81（世纪金榜）（世纪金榜）.2.Revise and master the use of it.3.Preview the Reading:HIV/AIDS:Are you at risk?2021/8/11 星期三30Thank youThank you2021/8/11 星期三312021/8/11 星期三32