英語中it用法市公開課金獎市賽課一等獎課件

1、it使用方法第1頁it用作主語it指代事物、動物、嬰兒或未知人What is this?-It is a book.Someone is at the door.-Who is it?Her new baby is tiny.It only weighs 2 kilos.第2頁指代天氣、時間、距離、季節(jié)、事物狀態(tài)和自然環(huán)境等It is getting colder and colder.It is two years since I last saw you.It was very quiet in the cafe.How is it with Mr.Rose?It is only twen

2、ty minutes drive to our college.第3頁it 作形式主語，代替不定式、動名詞或從句，使原來這些主語能夠放在句子后面，防止句子頭重腳輕。1.it代替不定式作主語It cost me $25 to buy the dictionary.Is it necessary to complete the design before National Day?Its a good idea to have a little note book handby.第4頁注意：有時不定式前面有一個for引發(fā)短語，表示不定式邏輯上主語，用it作形式主語時，組成下面句型It is+adj

3、.+for sb.+to do此句型中形容詞為靜態(tài)形容詞，即描寫人或物靜態(tài)特征形容詞，用來表示客觀情況。這么形容詞有：easy,difficult, important,hard,necessary,essencial,impossible,dangerous,common,unusual,big,small,tall,long,short,wide,old,young,beautiful等第5頁It is very difficut for me to learn Spanish.It is getting harder every day for a poor man to get a l

4、iving.注意：有時不定式前面有一個of引發(fā)短語，表示不定式邏輯上主語，用it作形式主語時，組成下面句型：It is+adj.+of sb.+to do此句型中形容詞為動態(tài)形容詞，即指那些有動作含義詞，或為描寫人或物特征或品質(zhì)形容詞，這么形容詞有：第6頁bold,brave,busy,careful,careless,clever,considerate,cruel,foolish,friendly,generous,good,honest,kind,lazy,nice,noisy,polite,rude,reasonable,selfish,shy,silly,stupid,thought

5、ful,wicked等It was generous of you to contribute so much.It was careless of her to lose her key of the safe.第7頁2.it代替動名詞作形式主語，而作主語動名詞常放在表語后，在此句型中表語有以下名詞和形容詞：no good,no use,a waste of time,fun,hard work,pity,a wonder,dangerous,difficult,senseless,useless,foolish,nice,hard,interesting,worth,worthwhile,

6、terrible,tiring,funny第8頁Its no use studying for an exam at the last minute.It is difficult finding your way around here.3.it代替從句作主語，有以下四個常見句型1)It+be+adj.+that從句這么adj通常有：possible/probable/likely 很可能impossible/unlikely 不可能obvious 顯而易見certain 很必定第9頁plain 很顯著 true 真clear 很清楚 fortunate 幸運是It was quite pl

7、ain that she didnt want to come.How is it possible that a man can fall so low?注意：當形容詞為以下形容詞時，從句可用虛擬語氣,為（should+）動詞原形advisable 適當，合理地 better 很好preferable 優(yōu)越，很好 essential 必要第10頁important 主要 insistent 堅持natural 自然 necessary 必要desirable 理想 urgent 緊迫unfair 不公平It is unfair that so many people should lose

8、their jobs.It is essential that you (should) win the voters hearts.It is important that this mission not fail.第11頁2)it+be+n.+that從句common knowledge 常識 an honour 非常榮幸 a shame 可恥a wonder 是個奇跡 no wonder 不足為奇a fact 事實 good news 好消息a pity 遺憾 a question 問題It is a wonder that he is still ailve.It is still

9、a question when we shall have our sports meet.第12頁注意：在此句型中，假如表示詫異、遺憾等感情，that引導從句謂語動詞慣用虛擬語氣“(should)+動詞原形”，但假如表示事實，謂語動詞就不用虛擬It is a pity that you should have to leave.很遺憾你不得不離開It is a pity that you left.遺憾是你離開了第13頁3)It+be+過去分詞+that從句It is said that. 聽說。It is reported that. 據(jù)報道。It is believed that. 據(jù)認

10、為。It is announced that. 據(jù)宣告。It must be pointed out that. 必須指出。It has been proved that. 已證實。It is estimated that. 據(jù)預計。It must be admitted that. 必須認可。It can thus be coucluded that. 能夠由此得出結(jié)論。第14頁It was reported that they had brought down two enemy planes.(擊落飛機)注意：假如過去分詞表示“提議、命令、愿望”等含義詞，從句用虛擬語氣“(should)

11、+動詞原形”suggested 提議 ordered 命令requested 要求 desired 希望demanded 要求 required 要求recommended 提議 decided 決定insisted 果斷要求 commanded 命令 第15頁It is recommended that the project(should) not start until all the preparations have been made.It was suggested that he (should) join the club activities.4)It+不及物動詞+that

12、從句，此句型中that從句能夠看做是句子主語，但不能放句首，其句型為：第16頁It seems that. 好像是。It happened that. 恰巧。It follows that. 由此可見。It matters that. 要緊是。It occurred to me that. 我突然想到。It struck me that. 我突然想到。Didnt it occur to you that your husband might be late?It is said that they are a happy pair.第17頁it用作賓語it作賓語，指代前面提到一樣東西、一個動物

13、、一個嬰兒或一件事情Did you see the snake?-Yes,I saw it.How about the baby?-Ill take care of it.Have you got my express mail?-Yes,Ive got it.If I have improved in any way,I owe it all to you.第18頁it作形式賓語，慣用在以下動詞后：consider,think,find,count(把.認為),feel,judge有以下幾個常見句型：1.主語+及物動詞+it+形容詞(作賓補)+不定式(真正賓語)常見形容詞有：第19頁poss

14、ible 很可能 difficult 困難impossible 不可能 wise 明智unwise 不明智 necessary 必要interesting 有趣 better 更加好些wrong 錯誤They judged it better to put off the meeting.I felt it necessary to make everything clear.第20頁2.主語+及物動詞+it+名詞(作賓補)+不定式(真正賓語)常見名詞有ones duty 某人職責 an honour 非常榮幸common knowledge 常識a question 問題 ones busi

15、ness 某人事a wonder 是個奇跡 no wonder 不足為奇good news 好消息 a shame 可恥a pity 遺憾第21頁Ill make it my business to help her.I dont think it a question for him to finish everything in one week.3.主語+及物動詞+it+名詞/形容詞/過去分詞(作賓補)+that從句(真正賓語)常見名詞有：第22頁ones duty 某人職責 an honour 非常榮幸common knowledge 常識a question 問題 ones busi

16、ness 某人事a wonder 是個奇跡 no wonder 不足為奇good news 好消息 a shame 可恥a pity 遺憾第23頁常見形容詞有：possible 很可能 difficult 困難impossible 不可能 wise 明智unwise 不明智 necessary 必要interesting 有趣 better 更加好些wrong 錯誤第24頁They kept it quiet that he was dead.We all think it a wonder that they finished the project in such a short time

17、.We heard it said that the meeting would be postponed.4.主語+及物動詞+it+名詞/形容詞(作賓補)+動名詞(真正賓語)在此句型中常見形容詞及名詞有：第25頁no good,no use,a waster of time,fun,hard work,a pity,a wonder,dangerous,difficult,senseless,useless,foolish,nice,tiring,funny,hard,interesting,worth,worthwhile,terribleHe found it no use writin

18、g to him.I think it dangerous swimming in such a deep river.第26頁5.it作賓語，用在一些特殊句型中See to it that you are not late again.注意別再遲到了You can put it that it was arranged before.你能夠說這是以前安排You many depend upon it that we shall never lose heart.你放心我們絕不會氣餒Id appreciate it if you would like to teach me how to us

19、e the computer.句型為appreciate/like/love/hate+it+if/that/wh-從句第27頁it作主題強調(diào)句it作主題強調(diào)句為：it is/was+被強調(diào)部分+that/who+其余部分被強調(diào)部分能夠是原來句子主語，賓語，主語或賓語補足語，狀語。強調(diào)假如是原因狀語從句，只能由because引導，不能由since，as或why引導。不能被強調(diào)部分是表語、謂語動詞或though/although等引導讓步狀從第28頁1.當被強調(diào)是主語，主語是人時，可用who或that等引發(fā)后面部分，不然用that；被強調(diào)是主語，要使用主格John might have boug

20、ht a new book for Mary yesterday.It is John who/that have bought a new book for Mary yesterday.(強調(diào)主語)It was she who/that suggested that he go to New York in order to get a direct flight.第29頁2.當被強調(diào)時賓語，賓語時人時，可用whom或that引發(fā)后面部分；被強調(diào)是物時，用that或which（不常見）John might have bought a new book for Mary yesterday.

21、It is a new book that/which John might have bought for Mary yesterday.It is this novel that/which they talked about last week.It is where the meeting will be held tha we want to know.(強調(diào)賓從)第30頁3.當被強調(diào)是主語補足語或賓語補足語時，用that引發(fā)后面部分It is Iron Man that he is called.(強調(diào)主補)It was chairman of the committee that

22、 we elected her.（強調(diào)賓補）It is red that he has painted the door.（強調(diào)賓補）第31頁4.當被強調(diào)是狀語時，用that引發(fā)后面部分，而不用when或where等It is for Mary that John might have bought a new book yesterday.(強調(diào)狀語)It was because the water had risen that they could not cross the river.(原因狀從)It was yesterday that I met him in the street

23、.(時間狀從)It was at an evening party that I first saw her.(地點狀從)第32頁5.“not.until”結(jié)構(gòu)中強調(diào)形式It is/was not until.that.My father didnt come home until 12 last night.It was not until 12 last night that my father came home.I didnt know it until he told me.It was not until he told that I knew it.第33頁6.It is. that強調(diào)句疑問句普通疑問句把is/was提前Was it she