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TherUseofit一、Itcanbeusedasapronoun..1.Guangzhouisabeautifulcity,isn’tit.(Hereitisusedasapersonalpronoun.)2.Whosebookisthat?ItisMary’s.(Hereitreferstothisorthat.)3.It______isacutebaby.(Hereitisrefersababywhosesexwedon’tknow.)二．Hereimpersonalitcanbeusedtotalkabouttime,distance,weather,date,temperature,measure,environment,etc.1．Itisarainyday.(weather)2.Itis20kilometersfrommyhousetoJames’.(distance)3.ItisNovember11,2005.(date)4.Itis9o’clockatnight.(time)5.Itwasveryquietinthecafé.(environment)6.Itissummernow.(season)7.Itisabout20pound/kg.(measure)8.Itis36degreesnow.SoIfeelveryhot.(temperature)9.What’sthecostofthedictionary?(price)It’sthreedollars.三、Itcanbeusedasaanticipatory。(Hereitcanbeusedinthesubjectorobjectpositiontostandforaninfinitive,-ingformoraclause.)A(Hereitisusedasaformalsubject.)1).Tosmokeisbad.=Itisbadtosmoke.2).Smokingisnogood.=Itisnogoodsmoking.3．Thatheheshouldhavefailedinthisexamisstrange.=Itisstrangethatheshouldhavefailedinhisexam.B(Hereitisusedasaformalobbject.)1）Hefoundthattostudytheplantwasimportant.=Hefounditimportanttostudytheplant.2）Hewasdead.Theykeptitquiet.=Theykeptitquietthathewasdead.3)Hethoughtitwasnousegoingoverthesubjectagain.=Hethoughtitnousegoingoverthesubjectagain.四、ItcanbeusedinthesentencewithItis…that/who…togivemoreemphasistothesubject,theobjectortheadverbial.Tommetyourbrotherintheparkyesterday.ItwasTomwho/thatmetyourbrotherintheparkyesterday.•ItwasyourbrotherthatTommetintheparkyesterday.•ItwasintheparkthatTommetyourbrotheryesterday.）•ItwasyesterdaythatTommetyourbrotherinthepark.五、Italsocanbeusedinsomesentences.1）Itseemsthat…好像/似乎2)Itissaid/reported/suggested/believedthat…据说/据报道/据建议/据信……3）Itisimpossible/necessary/strange…that…““……是不可能的/必要的/奇怪的”4）Itisapity/ashamethat…”……很可惜/很羞愧”5)Itiswell-knownthat…“众所周知…….”6)Itisimpossible/necessaryforsb.todosth.7)Itiskind/stupid/foolish/good/wiseofsb.todosth.