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学而思教育·学习改变命运思考成就未来！高考网….Weshould/could….Ifwe…,wecan….Itwouldbebetterto…c.Vocabularyinthisunit:benefit,disadvantage,range,available,pure,mass,float,absorb,stable,bottom;d.Usefulexpressions:benefitfrom,rangefrom…to….,alltheway,bemadeupof,thatis,freezingpoint,breakdown,mixwith,bemeasuredin…,takeadvantageof…,keep…steady,managetodo.e.Grammar:ReviewModalVerbs.情态动词can,could,may,might,will,would,shall,should,must,can’t等的用法。1)can/couldJincanspeakEnglishwell.(ability)CouldyoupleaseshowmethewaytoBeihaiPark?(request)2)may/mightMayweseetheawardsfortheteams?(permission;request)Shemightgiveyousomenewclothing.(possibility)3)will/wouldTheSpringFestivalisthemostfun.Thewholefamilywillcomefordinner.(promise;agreement)Oftenhewoulddressuplikearichman.(pasthabit;custom)4)shall/shouldTheharvestfestivalbeginsonSaturday.Weshallbetherewithourfriends.(promise;agreement)Youshouldarriveattheairporttwohoursbeforehegoes.(advice)5)must/can’tWangFengwinsanawardeveryyear.Hemustbeverystrong(speculation)Youmustbejoking.Thatcan’tbetrue.(guessing)Teachingprocedure:Period1.Contents:Warmingup&readingcomprehensionStep1.WarmingupAim:Makestudentsgettoknowsomethingaboutwater.学而思教育·学习改变命运思考成就未来！高考网:Howisthewaterbeingused?Step3.While-reading1.Scanning:Ssreadscantheboldwordsinthepassageandunderstandthestructureofthepassage.Howmanypartsarethereinthepassage?2.Ssreadandgetthemainideasofeachpart.Part1(para1):thepropertiesofwater;Part2(Para2):chemicalstructureofwater---H2OPart3(Para3):salinity-----thepercentageofsalt.Part4(Para4):DensityPart5(Para5):heatcapacityPart6(Para6-7)OceanmotionStep4.After-readingFinishthepost-readingExonP21.Step5.Assignment1.surftheinternetandgetmoreinformationaboutwaterandoceanusingsearchengineslikeyahooorbaidu.(orjustinputthekeywordslikeJulesVerneintotheaddresscolumnofIE)2.discussion:Whatwillyouprepareforwritinganexplanationofcorals?Afterdiscussion,workoutanoutline.Period2.Contents:difficultiesinthepassage.Step1.WarmingupAsksomeSstopresenttheirhomework.Step2.Learningaboutthelanguage:Playthetapeforstudentstofollow.Teacherexplainsomelanguagepointsinthetextonpage19--20.1.Whobenefitsfromusingwaterinthisway?Benefit…from/by…ThissongremindsmeofFrance.Remindmetoanswertheletter.Iremindedherthatthebookwouldcosthermuch.2.Lifeintheoceansrangesfromthetiniestplanktonallthewaytogiantlikesharksandwhales.Rangefrom…to…/rangebetween….And….意为“从。。。。到。。。不等；在一定的范围内变化”，例如：Temperatureshererangefrom10to30degreescentigrade.Pricesrangebetween￡7and￡10.Hisinterestsrangedfromchesstocanoeing.3.Thetwohydrogenatomsformapolarmolecule,thatis,onewithaslightlypositiveendandonewithaslightlynegativeend.学而思教育·学习改变命运思考成就未来！高考网，意为“那就是，即”Mybirthdayisaweeklater,thatis,March1st.JohnisaNewYorker,thatis,helivesinNewYork.4.Thenutrientsinwhateverfallsintotheoceanwillquicklybecomeavailabletootherlivingcreatures.Whatever引导名词性从句作宾语。Tellmewhateveristroublingyou.Sheisalwayssucceedsinwhatevershetries.5.Marineanimalsandplantstakeadvantageofthedensityofwater.Takeadvantageof“利用，欺骗”Takingadvantageofhisfriends,Mr.Liwasscolded.Healwaystakesadvantageofmistakesmadebyothers.Step3.PracticeSsfinishonpage14bythemselvesandthenchecktheanswers.Step4.Assignment1.Learntheusefulexpressionsbyheart.2.FinishEx1–3onpage96-97onWB3.readthewholepassagealoud.Period3.Contents:Grammar;talkingandspeakingStep1.RevisionChecktheanswersofEx1–3onpage96-97.Step2.ReviewModalVerbs.1情态动词的语法特征1）情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。2）情态动词除ought和have外，后面只能接不带to的不定式。3）情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。4）情态动词没有非谓语形式，即没有不定式，分词，等形式。2比较can和beableto1）can/could表示能力；可能（过去时用could）,只用于现在式和过去式（could）。beableto可以用于各种时态。例如：Theywillbeabletotellyouthenewssoon.他很快就能告诉你消息了。2）只用beableto的情况：a.位于助动词后。b.情态动词后。c.表示过去某时刻动作时。d.用于句首表示条件。e.表示成功地做了某事时，用was/wereableto，不能用could。例如：HewasabletofleeEuropebeforethewarbrokeout.=HemanagedtofleeEuropebeforethewarbrokeout.他在战争爆发之前逃离欧洲。注意：could有时不表示时态1）提出委婉的请求，（注意在回答中不可用could）。例如：学而思教育·学习改变命运思考成就未来！高考网我能看电视吗？---Yes,youcan./No,youcan't.可以/不可以。2）在否定句、疑问句中表示推测或怀疑。例如：Hecouldn'tbeabadman.他不大可能是坏人。3比较may和might1）表示允许或请求；表示没有把握的推测；may放在句首，表示祝愿。例如：MayGodblessyou!愿上帝保佑你！Hemightbeathome.他可能在家。注意：might表示推测时，不表示时态，只是可能性比may小。2）成语：may/mightaswell，后面接不带to的不定式，意为不妨。例如：Ifthatisthecase,wemayaswelltry.如果情况确实如此，我们不妨试一试。典型例题Peter___comewithustonight,butheisn'tverysureyet.A.mustB.mayC.canD.will答案B.表可能性只能用may。此句意可从后半句推出。4比较haveto和must1）两词都是'必须'的意思，haveto表示客观的需要，must表示说话人主观上的看法，既主观上的必要。例如：Mybrotherwasveryill,soIhadtocallthedoctorinthemiddleofthenight.弟弟病得很厉害，我只得半夜里把医生请来。（客观上需要做这件事）Hesaidthattheymustworkhard.他说他们必须努力工作。（主观上要做这件事）2）haveto有人称、数、时态的变化，而must只有一种形式。但must可用于间接引语中表示过去的必要或义务。例如：Hehadtolookafterhissisteryesterday