英语选修6unit3语法-it的用法ppt课件.ppt

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1、GrammarTheuseof“it”it真实身份大揭底Ⅰ.用作人称代词Ⅱ.用作非人称代词Ⅲ.It作形式主语Ⅳ.It作形式宾语Ⅴ.It用在特定句型中Ⅵ.It用在固定习语中“It”用作“人称代词”1.It指代上文中提到的物、事。（简化语言，避免重复）eg.Mypenismissing.Ican’tfindit.Xi’anis a beautiful city,isn’tit?Isthisyourdog？No,itisn’t.2.指代性别不明的人（常指baby）/说话人不清楚性别的人（常在打电话、敲门等时）:eg.Thebabycriedbecauseitw

2、ashungry.Thereisaknockatthedoor.Itmustbethemilkman.3.代替上文中的指示代词this/that--Whoisthatoverthere?--It’sHelen.Ⅰ.用作人称代词“It”用作“非人称代词”“it”表示天气、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it）：Itisabout5kilograms.Howisitgoing?Ⅱ.用作非人称代词Itisabitwindy.(指天气)Itwasnearlymidnightwhenshecameback.It‘sMay1,20

3、17.Itis150yuan.Itissummernow.Itwasveryquietin the café.Itishalfanhour’s walk tothecitycentre（指时间）（指日期）（指价格）(指季节)（指度量）(指环境)(指距离)(指情形)“It”用作“形式主语”（8）it：形式主语todo：真正主语（3）it：形式主语doing：真正主语（1）it：形式主语that从句：真正主语（4）adj.：legal，illegal，polite，impolite，possible,impossible,clear，obvious，evid

4、ent,certain，suitable，fit，useful，useless，etc.)一、①it+be+adj.(+forsb.）+todosth.“（对sb.来说，）做某事是…的。”ItisimportantforustolearnEnglishwell.②it+be+adj.+ofsb.+todosth.It'skindofyoutohelpmewiththeproblem.It’sgenerous(adj.慷慨的)ofyoutodonatesuchalargeofmoneytocharity.（此处adj.通常为描述“人”的形容词：brave,

5、kind，unkind，nice，rude，considerate，careful，careless，silly，foolish，stupid，clever，wise，crazy.）③it+be+n.+todosth.Itisagoodideatoquitsmokingbeforeonecomespregnant.Itisapity/shamenottoseethatscholarintheflesh.“做某事（真）是个…”常用n.有：goodidea/apity/ashame等二、it+be+n./adj.+doingsth.eg.It'snousec

6、ryingoverspiltmilk.It'sawasteoftimeplayingcomputergames.It’sworthvisting.It'suselessthinkingtoomuch.It’snouse/uselessdoingsth做某事是无用的It’snogood/awasteoftime/fun/worthdoingsthItisveryclearthathe’sroundandtalllikeatree.三、1.It+be+adj.+that从句.Itiscertainthateverythingwillgetonwellduet

7、oourhardwork.Itisstrangethatheshouldn’tfeelashamedofhisbehavior.（当adj.为strange/surprising/natural/important/necessary等时，that从句中即(should)+do）2.it+be+n.+that从句.Itisnowonderthatyouarebreathless.Itisapity/shamethatheshouldgetintothehabitofabusingalcohol.（其中，当n.为apity(ashame/anhonor/a

8、Surprise...等表示出乎意料时，常译为“竟然”，则that从句中的v.用