1、 The use of“it”it 真实身份大揭底真实身份大揭底.用作人称代词用作人称代词.用作非人称代词用作非人称代词.It .It 作形式主语作形式主语.It.It 作形式宾语作形式宾语.It.It 用在特定句型中用在特定句型中.It.It 用在固定习语中用在固定习语中“It”用作用作“人称代词人称代词”1.It 指代上文中提到的物、事。指代上文中提到的物、事。（简化语言，避免重复）（简化语言，避免重复）eg.My pen is missing.I cant find it.Xian is a beautiful city,isnt it?Is this your dog？No,it is
2、nt.2.指代性别不明的人（常指指代性别不明的人（常指baby）/说话人不清说话人不清 楚性别的人（常在打电话、敲门等时）楚性别的人（常在打电话、敲门等时）:eg.The baby cried because it was hungry.There is a knock at the door.It must be the milkman.3.代替上文中的指示代词代替上文中的指示代词this/that-Who is that over there?-Its Helen.用作人称代词用作人称代词“It”用作用作“非人称代词非人称代词”“it”表示天气、时间、日期、距离、价值、度量、温度、表示天气
3、、时间、日期、距离、价值、度量、温度、环境，季节，情况等（称为非人称的环境，季节，情况等（称为非人称的it）：）：It is about 5 kilograms.How is it going?.用作非人称代词用作非人称代词It is a bit windy.(指天气指天气)It was nearly midnight when she came back.Its May 1,2007.It is 150 yuan.It is summer now.It was very quiet in the caf.It is half an hours walk to the city centre（
4、指时间）（指时间）（指日期）（指日期）（指价格）（指价格）(指季节指季节)（指度量）（指度量）(指环境指环境)(指距离指距离)(指情形指情形)“It”用作用作“形式主语形式主语”（8）1.it：形式主语：形式主语 to do：真正主语（：真正主语（3）2.it：形式主语：形式主语 doing：真正主语（：真正主语（1）3.it：形式主语：形式主语 that从句：真正主语（从句：真正主语（4）adj.：legal，illegal，polite，impolite，possible,impossible,clear，obvious，evident,certain，suitable，fit，usefu
5、l，useless，etc.)一、一、it+be+adj.(+for sb.）+to do sth.“（对 sb.来说，）做某事是的。”It is important for us to learn English well.it+be+adj.+of sb.+to do sth.Its kind of you to help me with the problem.Its generous(adj.慷慨的慷慨的)of you to donate such a large of money to charity.（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：brave,ki
6、nd，unkind，nice，rude，considerate，careful，careless，silly，foolish，stupid，clever，wise，crazy.）it+be+n.+to do sth.It is a good idea to quit smoking before one comes pregnant.It is a pity/shame not to see that scholar in the flesh.“做某事（真）是个做某事（真）是个”常用常用n.有：有：good idea/a pity/a shame等等二、二、it+be+n./adj.+doin
7、g sth.eg.Its no use crying over spilt milk.Its a waste of time playing computer games.Its worth visting.Its useless thinking too much.Its no use/useless doing sth 做某事是无用的做某事是无用的Its no good/a waste of time/fun/worth doing sthIt is very clear that hes round and tall like a tree.三、三、1.It+be+adj.+that从句
8、从句.It is certain that everything will get on well due to our hard work.It is strange that he shouldnt feel ashamed of his behavior.（当（当adj.为为strange/surprising/natural/important/necessary等时，等时，that 从句中即从句中即(should)+do）2.it+be+n.+that从句从句.It is no wonder that you are breathless.It is a pity/shame tha
9、t he should get into the habit of abusing alcohol.（其中，当其中，当n.为为a pity(a shame/an honor/a Surprise.等表示表示出乎意料出乎意料时，常译为时，常译为“竟然竟然”，则则 that 从句中的从句中的v.用虚拟语气，即用虚拟语气，即should+do）。没有这种意义时，则不用虚没有这种意义时，则不用虚拟语气。例如：拟语气。例如：It is reported that many people died in the earthquake.3.it+be+V.ed+that从句从句.“据据/有人（人们）有人（人
10、们）”It is suggested that the students(should)build up their strength.(其中，当其中，当v.为为insist;command,order;suggest,recommend;require,request,demand等时，等时，that 从句中的从句中的v.用虚拟语气，即用虚拟语气，即(should)+do4.it+Vi+that从句从句.(常用常用v.有有happen,seem,appear,looks,等等.)It happened that he met his teacher in the street.eg.It s
11、eems that he will be back in a few days.“It”用作用作“形式宾语形式宾语”（2）1.“某些谓某些谓v.+it 宾语宾语+宾补宾补（n.adj.）+真宾真宾 （to do doingthat从从句）句）”.It.It 作作“形式宾语形式宾语”常用的常用的v.有有:think,believe,make,find,consider,feel,etc.I think it no use arguing with him.I found it very interesting to study English.He made it clear that smok
12、ing is banned in the school.He considers it his duty to help those at risk.2.某些某些谓谓v.+it 形宾形宾+真宾真宾（that/when/if 从句）从句）（常用（常用v.用：用：like,love,appreciate;dislike,hate depend on,count on;see to,make sure;takefor granted等。）等。）eg.I dont like it when one speaks with his mouthful.eg.I would appreciate it if
13、 I were admitted to the school football team.eg.I hate it that you speak when your mouth full.eg.Dont take it for granted that famous brands mean high quality.eg.You can depend on it that he will come here on time.Exercises TimeI.单项选择单项选择1.He didnt make _ clear when and where the meeting would be he
14、ld.(天津天津)A.this B.that C.it D.these 2._ is our belief that improvements in health care will lead to a stronger,more prosperous economy.(浙江浙江)A.As B.That C.This D.It3.The doctor advised Vera strongly that she should take a holiday,but _ didnt help.(全国卷全国卷III)A.it B.she C.which D.he4.Id appreciate _ if you would like to teach me how to use the computer.(山东山东)A.thatB.it C.this D.you1.Revise and master the use of it.2.Pre-view the Reading:HIV/AIDS:Are you at risk?HomeworkSee you next time!
