新概念2 第43课 PPT课件

Lesson43OvertheSouthPolecan/can’t/could/couldn’tIcandancethedisco.Ican’tperformballet.Icouldrowaboatoneyearago.Icouldn’tswimwhenIwasfour.flykites/makemodelplanes/takephotos/singEnglishsongs.ReviewFirstlistenandthenanswerthequestion.听录音，然后回答以下问题。Howwastheplaneabletoclearthemountains?TheAmericanexplorerorderedhismentothrowouttwoheavyfoodsackssotheplaneroseto10000feet.Newwordsandexpressions生词和短语polen.（地球的）极flightn.飞行explorern.探险家liev.处于seriousadj.严重的pointn.地点seemv.似乎crashv.坠毁sackn.袋子clearv.越过aircraftn.飞机endlessadj.无尽的plainn.平原Askandanswer:1.WhendidthemansuccessfullyflyovertheSouthPoleforthefirsttime?2.WhosuccessfullyflewovertheSouthpoleforthefirsttime?3.Wouldtheplanecrash?4.Howdidtheyclearthemountain?5.WhydidByrdnowknowthathewouldbeabletoreachtheSouthPole?6.Wasthereanydifficulties?In1929,threeyearsafterhisflightovertheNorthPole,theAmericanexplorer,R.E.Byrd,successfullyflewovertheSouthPoleforthefirsttime.Though,atfirst,Byrdandhismenwereabletotakeagreatmanyphotographsofthemountainsthatlaybelow,theysoonranintoserioustrouble.Atonepoint,itseemedcertainthattheirplanewouldcrash.Itcouldonlygetoverthemountainsifitroseto10,000feet.Byrdatonceorderedhismentothrowouttwoheavyfoodsacks.Theplanewasthenabletoriseanditclearedthemountainsby400feet.ByrdnowknewthathewouldbeabletoreachtheSouthPolewhichwas300milesaway,fortherewerenomoremountainsinsight.Theaircraftwasabletoflyovertheendlesswhiteplainswithoutdifficulty.can"Can"isoneofthemostcommonlyusedmodalverbsinEnglish.Itcanbeusedtoexpressabilityoropportunity,torequestorofferpermission,andtoshowpossibilityorimpossibility.Examples:Icanrideahorse.abilityWecanstaywithmybrotherwhenweareinParis.opportunityShecannotstayoutafter10PM.permissionCanyouhandmethestapler?requestAnychildcangrowuptobepresident.possibilityCould"Could"isusedtoexpresspossibilityorpastabilityaswellastomakesuggestionsandrequests."Could"isalsocommonlyusedinconditionalsentencesastheconditionalformof"can."Examples:Extremeraincouldcausetherivertofloodthecity.possibilityNancycouldskilikeaprobytheageof11.pastabilityYoucouldseeamovieorgoouttodinner.suggestionCouldIuseyourcomputertoemailmyboss?requestWecouldgoonthetripifIdidn'thavetoworkthisweekend.conditional"Could"cannotbeusedinpositivesentencesinwhichyoudescribeamomentaryorone-timeability.e.g.Yesterday,Icouldliftthecouchbymyself.NotCorrect比较can和be able to表示成功地做了某事时，只能用was/were able to， 不能用could。He could swim halfway before he got tired. (notcorrect)He was able to swim halfway before he got tired.(correct)can用于表示“能力”时是指现在的能力，过去或将来的能力通常用was/were able to或will/shall be able to表示。Sumupthelanguagepoints习惯用语:dancethedisco/performballet/takephotos/wordout/take…to…/rowaboat/begoodat/singsongs/flyakite/makemodelplanes/beinhospital/haveagoodtime语法知识:情态动词:can/can’t【Newwordsandexpressions】生词和短语★pole　n.　（地球的）极SouthPole南极NorthPole北极PoleStar北极星★lie　v.处于tellalie撒谎lien.谎言;liev.撒谎Eg.:Youlied.You,liar!lie,lied,lied撒谎lie/lai/,lay/lei/,lain/lein/处于,位于stayinbed/lieinbed躺在床上inbed介词短语,lievi.lie现在分词-->lyinglayv.放,放置;　layanegg　下一个蛋layvt.laysth.放,放置lay,laid,laid★explorer　n.探险家explorev.探险explorationn.(科研相关)探险,探求,开发adventure　n.冒险(追求刺激)venturen.冒险(为了财富,没有生命保障)★seemv.似乎，看起来seem+asif看起来似乎……他看起来似乎以前从来没有在英国居住过。HeseemsasifhehadneverlivedinEnglandbefore.seem+adj.他看起来很有钱。Heseemsrich.seemtobeHeseemstoberich.seemthat…看起来似乎……Itseemsthatheisrich.★clearv.越过(凌空、不接触地)越过,跳过，没有接触面的飞跃飞跃山峰clearthemountain那匹马越过了栅栏Thehorseclearedthefence.overadv.越过(距离)goover飞跃★plainn.平原plaingirl平凡的女孩③lay是动词lie的过去式。表示“处于什么位置”。lie与lay的区别：（1）lie作“躺，卧、处于（位置）”解时，过去式为：lay,过去分词为：lain；（2）lie作“撒谎”解时，过去式为：lied,过去分词为：lied；（3）lay可作“放，摆，搁；产卵”解，其过去式和过去分词均为：laid【例】Thebooksstill_____whereI_____themamonthago.A:lie,laid　　　B:lay,laidC:lied,lain　　Dlain,lied此题选B。这句话的意思是：上个月前我“放”在那的书现在还“躺”在那里。★point　n.地点point点,一般指从飞机上向下看的点地点　place,spotdot点@->at★seem　v.似乎seem+asifseem+adv.seem　tobeseem　that...Eg.:Heseemsrich.　　　Heseemstoberich.　　　Itseemsthatheisrich.itseemsthat...看起来似乎...seemasif看起来似乎Eg.:HeseemsasifhehadneverlivedinEnglandbefore.★crash　v.坠毁crash(从上向下掉)aircrash空难strike撞击clash撞击,冲突★clear　v.越过over越过(距离)clear(凌空)越过goover飞跃clearthemountain飞跃山峰Thehorseclearedthefense.★plain　n.平原mountains高山plaingirl平凡的女孩Eg.:I'maplaingirl.课文讲解1、In1929,threeyearsafterhisflightovertheNorthPole,theAmericanexplorer,R.E.Byrd,successfullyflewovertheSouthPoleforthefirsttime.forthefirsttime第一次time表示“次，回”，还可以说thistime，lasttime，nexttime，anothertime，eachtime，forthelasttime我最后一次提醒你，如果你不快点，你就会赶不上火车的。Iremindyouforthelasttimethatifyoudon’thurry,you’llmissthetrain.下次你见到他的时候，把这些照片给他。Givehimthesephotosnexttimeyouseehim.（1）这句话包含两个同位语。threeyearsafter…为1929的同位语，作插入性的补充说明；R．E．Byrd作theAmericanexplorer的同位语。2、Though,atfirst,Byrdandhismenwereabletotakeagreatmanyphotographsofthemountainsthatlaybelow,theysoonranintoserioustrouble.连词though引导让步状语从句，其含义是“虽然……，尽管……”。它永远不与but连用。can...可能性（只用于现在式和过去式）beableto...可能性,成功地做（可用于各种时态）takeaphotographof…拍……的照片在他离开家之前，他给他的房子照了张照片。Hetookaphotographofhishousebeforehelefthome.runintotrouble=getintotrouble遇到麻烦，陷入困境每次他遇到困难了，他都向父母寻求帮助。Eachtimeheranintotrouble,heaskedhisparentsforhelp.3、Atonepoint,itseemedcertainthattheirplanewouldcrash.atonepoint在某一地方，在某一时刻（point也指时间上的某一点）他曾一度下决心要当个画家。Atonepoint,hemadeuphismindtobecomeapainter.it为先行主语，真正的主语为that引导的从句。it作先行主语时经常与seem，appear，look等连用：现在似乎可以肯定会议将被推迟。Itnowlookscertainthatthemeetingisgoingtobeputoff.4、Itcouldonlygetoverthemountainsifitroseto10,000feet.riseto…上升至……5、Theplanewasthenabletoriseanditclearedthemountainsby400feet.by表示“相差，以……之差”的意思我晚了10分钟，没赶上火车。Imissedthetrainbytenminutes.他比我小两岁。Heisyoungerthanmebytwoyears.…fortherewerenomoremountainsinsight.……因为前面再没有山了。for表示“因为”。insight表示“在看得见的范围内”、“在可看见之处”：Nomanwasinsight.一个人也看不见。Can和beableto的区别can与beableto用法上的区别 口语中,can与beableto在用法上既有相同的一方面,又有不同的地方,这是应该引起注意的。当它们表示能力的时候，是同义的。如： Hecanspeaktwoforeignlanguages. Heisabletospeaktwoforeignlanguages.表示过去通过努力终于做成了某事要用beableto，而不能用can。如： Iwasabletoswimtothebankaftertheboatturnedover. can和beableto都可以表示能力.can泛指一般的能力,而且只有两种形式,即:can,could．beableto则主要指具体做到了某件事的能力，其形式主要是靠be发生变化，所以形式比can多．可以说：Icanswim.Iamabletoswim.但是不能说：Allthepeoplecouldescapefromthebigfireintime.只能说：Allthepeoplewereabletoescapefromthefireintime.can能表猜测，beableto不能。can的这种用法主要用于疑问句和否定句。 Somebodyisknockingatthedoor.Whocanitbe? Itcan’tbeourteacherwhoisknockingatthedoor. 其肯定形式是mustbe。如: Itmustbeourteacherwhoisknockingatthedoor..beableto后边接动词不定式表示一种实际情况时，其否定形式不是benotableto，而是cannot。如： Wereyouabletocatchthefirstbusyesterdaymorning? No,Icouldn’t. 7.一般说来,beableto后边的动词不定式没有被动语态。如: I’msureheisabletocorrecthismistakesingrammar. 不说:*I’msurehismistakesareabletobecorrectedbyhim.美国探险家R·E·伯德在飞越北极3年之后，于1929年第1次飞越了南极。（1）这句话包含两个同位语。threeyearsafter…为1929的同位语，作插入性的补充说明；R．E．Byrd作theAmericanexplorer的同位语。（2）forthefirsttime表示“第一次”，time在这里表示“次”、“回”，还可以说thistime,lasttime,nexttime,anothertime,eachtime,forthelasttime等：Iremindyouforthelasttimethatifyoudon'thurry,you'llmissthetrain.我最后一次提醒你，如果不快点，你会误了火车的。Givehimthesephotosnexttimeyouseehim.下次你见到他时把这些相片给他。虽然开始时伯德和他的助手们拍下了飞机下面连绵群山的大量照片，但他们很快就陷入了困境。（1）连词though引导的是让步状语从句，其含义为“虽然……”、“尽管……”。这个从句中的时间状语atfirst被单独用逗号隔开了，它如果按正常的词序应放在从句的末尾，但有可能会引起误解。（2）atfirst与主句中的soon形成时间上的照应，表示先后次序。（3）takeaphotographof表示“拍……的照片”：Hetookaphotographofhishousebeforehelefthome.他离家前给他家的房子拍了一张照片。（4）thatlaybelow为themountains的定语从句，that为从句的主语。（5）runintotrouble的含义与getintotrouble相似，表示“陷入困境”：Eachtimeheranintotrouble,heaskedhisparentsforhelp.每当他陷入困境时，他都向他父母求助。在有个地方，飞机似乎肯定要坠毁了。（1）atonepoint在此处可以解释为“在有个地方”，但它通常的含义为“在某一时刻”，point指时间上的某一点：Atonepoint,hemadeuphismindtobecomeapainter.他曾一度下决心要当个画家。（2）it为“先行主语”，真正的主语为that引导的从句。it作先行主语时经常与seem，appear，look等连用：Itnowlookscertainthatthemeetingisgoingtobeputoff.现在似乎可以肯定会议将被推迟。5．…itclearedthemountainsby 400feet.……它在离山头400英尺的高度飞越了过去。clear在这里表示“（不接触地）越过”：Hecleared2.10metres.他跳过了2.10米。by表示“以……之差”：Imissedthetrainbytenminutes.我晚了10分钟，没赶上火车。Heisyoungerthanmebytwoyears.他比我小两岁。…fortherewerenomoremountainsinsight.……因为前面再没有山了。for表示“因为”。insight表示“在看得见的范围内”、“在可看见之处”：Nomanwasinsight.一个人也看不见。2.He____playthepianonow,buthe___playthepianotwoyearsago.A.could;canB.can;couldn’tC.can;couldD.can;can’t3.IboughtadollforMary___abirthdaypresent.A.asB.atC.toD.withExercise1.Tomisn’tatschooltoday,becausehewas___yesterday.A.inthehospitalB.inhospitalC.inahospitalD.athospital4.Timcan’tplay__piano,buthecanplay___tennis.A./;theB.the;/C./;/D.the;the5.—Canyouskate?—___,Ican.A.OfcourseB.SorryC.NoD./Janecan’tuseacomputer.No,Ican’t.Idon’tthinkhecanplaythesoccer.Whencouldsheswim?句型转换1.Janecanuseacomputer.(改为否定句)2.Canyoudraw.(作否定回答)3.Ithinkhecanplaythesoccer.(变否定句)4.Shecouldswimwhenshewasfive.(提问)