Whatisit?.carefulperson.Itisabadhabitformalesandfemales.Youcanbecomeaddictedtoit.Somepeoplethinkyouaregrownupifyoudothis.Itmakesyousmellbad,andturnyourteethyellow.Whatisit?Smoking.carefulperson.Itisabadhabitforbothmalesandfemales.Itissomethingyoushouldn’tstartbecauseyouwillbeaddictedtoit.Itissomethingwhichisillegal.Itisaveryexpensivehabitandsowillwasteyourmoney.Whatisit?drugtaking.carefulperson.Itisadiseaseyoucancatchifyouhaveunprotectedsex.Thisillnessstayinyourbodyforalongtimeandeventuallyweakensyourimmunesystem.Thereisnocureatthemomentforthisillness.Whatisit?AIDS.carefulperson.Itisabadhabitformalesandfemales.Itbeginsasasocialactivityatmealtimes.Itisbannedbeforeyouaredrivingacar.Itcanbecomeaddictiveandcausegreatharmtothebody.Whatisit?Drinkingalcohol.carefulperson.Itisabadhabit……Itbeginsas……Itonlybecomes……Itisadisease……Itissomething…...Itmakesyousmellbad…….carefulperson.-Whatdoyouthinkofthemovie?-It’soneofthebestmoviesthatI’veseen.Who’sthelovelybaby?It’sJerry'sbaby.Itcanbeusedaspersonalpronouns(人称代词),referringtotheanimalormattermentionedabove,orthepersonwhoyouarenotsureofgender.summary1____wasasunnyday.Peterdecidedtogoforawalktothepark,though_____wastwomilesaway.___wassocomfortabletowalkonthestreet.ititItSuddenly___begantorain.Hefound__hardtowalkthere.Thenhetookabushome.Unfortunately___wentwrong.Whenhegothome,hewaswetthrough.Thus___wasadaythathewouldneverforget.Itititit____wasasunnyday.Peterdecidedtogoforawalktothepark,though_____wastwomilesaway.___wassocomfortabletowalkonthestreet.ititItSuddenly___begantorain.Hefound__hardtowalkthere.Thenhetookabushome.Unfortunately___wentwrong.Whenhegothome,hewaswetthrough.Thus___wasadaythathewouldneverforget.ItitititSummary2Itcanbeusedasimpersonalpronouns（非人称代词）totalkabouttime,date,distanceorweatherandsoon.____wasasunnyday.Peterdecidedtogoforawalktothepark,though_____wastwomilesaway.___wassocomfortabletowalkonthestreet.ititItSuddenly___begantorain.Hefound__hardtowalkthere.Thenhetookabushome.Unfortunately___wentwrong.Whenhegothome,hewaswetthrough.Thus___wasadaythathewouldneverforget.ItitititReadinReadinggAdvicefromGrandad1.Itisnoteasytostopsmoking.2.ItseemsamazingthatatmyageIamstillfitenoughtocycle20kilometresinanaftermoon.3.Youarefoundingitdifficulttogiveitup.Summary3“It”canbeusedinthesubjectorobjectpositiontostandfortheinfinitive（不定式）oraclause.Rewritethesesentencesusingan“it”structure.1.Givingupsmokingisdifficult.Itis2.Someyoungpeoplethinktheylookattractivewhentheysmoke.Itseems3.Mostpeoplebelievesmokingcausescancer.Itisbelieveddifficulttogiveupsmoking.thatsomeyoungpeoplethinktheylookattractivewhentheysmoke.thatsmokingcausescancer.4.Youarenotallowedtosellcigrettesinthiscountry.Itisillegal5.Youcouldsufferfrombadhealthifyoukeepsmoking.Itislikely6.Youhavetotakepillstocontrolyourbloodypressure.Itisnecessarytosellcigrettesinthiscountry.thatyoucouldsufferfrombadhealthifyoukeepsmoking.foryoutotakepillstocontrolyourbloodypressure.Preparatorysubject（形式主语）adj.n.Itis/wasItis/wasatodotodoItisimpolitetotalkloudlyinpublicplaces.Itisverykindofyoutohelpme.Itisapitytolosethegoodchance.Preparatorysubject（形式主语）nouse/uselessItis/wasdoingnogood/fun/awasteoftimeItis/wasdoingPreparatorysubject（形式主语）adj.difficult/important.....n.pleasure/shame....v.Itis/wasItis/wasaItappears/seemshappenedissaid/reported....occurredtosb.thatthatthatPreparatoryobject（形式宾语）Sb.+thinkmakeitfind+adj./n.todo…+that…Jointhetwosentencesbyusing“it”asobject.JanethinksitfunnythatIhavetakenupChinesekungfu.IhavetakenupChinesekungfu.Janethinksitisfunny.Itcanbeusedaspersonalpronouns（人称代词）Itcanbeusedasimpersonalpronouns（非人称代词）Itcanbeusedinthesubjectorobjectpositiontostandfortheinfinitiv（不定式）oraclause.ReviewtheuseofitbydoingtheexerciseonP57.Ifyouwantknowledge,youmusttoilforit.要想求知，就得吃苦。要想求知，就得吃苦。Theuseof“it”foremphasis可被强调的部分除谓语之外的句子各成分。基本句子结构Itis/was＋被强调部分＋that/who/whom+其它。备注is既可强调现在的情况，也可强调过去的情况。Summary4Theuseof“it”foremphasis可被强调的部分除谓语之外的句子各成分。基本句子结构Itis/was＋被强调部分＋that/who/whom+其它。备注is既可强调现在的情况，也可强调过去的情况。Summary4WecalledonProfessorWangathisofficethismorning.weProfessorWangEg:Itwaswewho/thatcalledonProfessorWangathisofficethismorning.ItwasProfessorWangwhom/that/whowecalledonathisofficethismorning.WecalledonProfessorWangathisofficethismorning.athisofficethismorningItwasathisofficethatwecalledonProfessorWangthismorning.ItwasthismorningthatwecalledonProfessorWangathisoffice.
