It•1,指代时间，天气，距离，日期等。•It’saboutanhour’swalkfromheretothevillage.•ItwasnearlymidnightwhenIarrivedhome.•2,指代this,that•What’sthisinEnglish?•It’sacomputer.•3,指代无生命吴或性别不明，身份不明的人•Whatalovelybaby,isn’tit?•Someoneisknockingatthedoor,whocanitbe?•4,指代上文，即事件•Jimhasleft.Haveyouheardofit?•Itoldhimtoreadalot,butitdidn’thelp.•5,形式主语，代替不定式，动名词，从句•Itisnecessarytokeepthebalanceofnature.•Itisnousecryingoverspiltmilk.•Itiswell-knownthatTaiwanbelongstochina.•6,形式宾语，代替不定式，动名词，从句、•Ifounditnecessarytotellthetruth.•Ithinkitisnousearguingwithhimoverit.•Youmustkeepitinmindthatyouareastudent.•7.强调句型•ItwasinthestreetthatIsawhimyesterday.•WherewasitthatIsawhimyesterday?Shedidn’tgotobeduntilherfathercameback.1)Notuntilherfathercamebackdidshegotobed.2)Itwasnotuntilherfathercamebackthatshewenttobed.1)Itwasnot___shetookoffherdarkglasses___Irealizedshewasafamousfilmstar.A.when,thatB.until,whenC.until,thatD.when,thenExercises2)Itwasnotuntil____that____topreparehislessons.A.didhisfathercomein,theboybeganB.didhisfathercomein,didtheboybeginC.hisfathercamein,didtheboybeginD.hisfathercamein,theboybegan•8,固定句型。1Hate/likeitwhen讨厌／喜欢某人做2Seetoitthat务必做3Takeitforgrantedthat认为．．想当然4Oweittosb.that把．．归功于某人5Itoccurredtosbthat某人想起6Ithappenedthat碰巧7Itappeared/seemedthat似乎8Itissaid/suggested/reported/thoughtthat据说9Itturns/turnedoutthat原来是1.Ilikeitwhenyouhelpothers.2.Seetoitthatyoudon’tcatchacold.3.HetookitforgrantedthatIshouldsupporthim.4.Heowedittothedoctorthathewasstillalive.5.Itoccurredtohimthatheshouldleave.6.Itsohappenedthattherewasnobody7.Itappearedthathedidn’ttellmethetruth.8.Itissuggestedthatweshouldholdaspeech9.Itturnsoutthatthewhetherisfine9，常用句型Itwill/bewas+时间段+before..要过／过了多才Itis/hasbeen+时间段+sincedid自从..已经Itwas+时间段+sincehaddoneItis/was+时间点+when当．．时时间是Itis/was+介词+时间点／段+that强调句型9，易错句式:下列句式用therebeThereisnoneeddoing/for没有必要Thereisnopossibilitythat没有可能thereissomedifficulty/troublein做…有困难thereisnodoubtthat无疑Thereisachancethat做…有可能1,thereisnoneedwaitingforhisanswer.2.Thereisnopossibilitythattheboywillwintheprize.3.Idon’tknowwhetherthereisanychanceofarrivingontime.4.Thereissomedifficultyinexplainingthistotheboy.Revision1.Itwasnotuntil1920____regularradiobroadcastbegan.AwhileBwhichCthatDsince2.Manypeoplenowmake___aruletobuycardsfortheirfriendsbeforeChristmas.A.themselvesB.itC.thatD.this3._____isverycleartoeveryonethathe’sroundandtalllikeatree.A.ThisB.WhatC.ThatD.It4.IntheUnitedStates,bustraveldoesn’tcostmuchastraintravel,___?A.don’ttheyB.doesitC.dotheyD.doesn'tit5.Has____beendecidedwhenwearetoholdthesports-meeting?A.thatB.thisC.itD.what6.Someoneisatthedoor,whois___?A.thisB.thatC.itD.he7.----Doyouwantanewwatch?-----Yes,Iwant____.AitBthatConeDwhat8.—Myhomeisinthattallbuildingoverthere.—______?A.CanitseeB.CanseeitC.CanbeseenitD.Canitbeseen9.___isafactthatEnglishisbeingacceptedasaninternationallanguage.A.thatB.thisC.itD.what10.—DidTomcallmewhileIwasout?—Yes,itwas____thatcalledyou.A.himB.heC.whoD.whom11.Idon’tthink____difficultforaChinesestudenttomasteraforeignlanguagewithinfiveyearsA.thatB.itC.tooD.very12.It’sthesecondtimeyou_______latethisweek.A.arriveB.arrivedC.havearrivedD.hadarrived
