九年级下册英语第13单元Section A-2PPT课件

.,Unit13,Weretryingtosavetheearth.,SectionA3a-4c,.,学习目标,Keywords其中的also有时可以省略。,.,e.g.Shenotonlyplayswell,butalsowritesmusic.她不但很会演奏，而且还会作曲。Notonlymenbutalsowomenwerechosen.不仅仅是男的，女的也有被选中的。,.,若连接两个成分作主语，其谓语通常与靠近的主语保持一致。e.g.Notonlyyoubutalsohehastoleave.不只是你，他也得离开。,notonly放在句首，后接句子时要用倒装结构。e.g.Notonlyhadthepoormanbeenfined,butalsohehadbeensenttoprison.这个可怜的人不仅被罚款，而且还被送进了监狱。,.,beharmfulto对有害e.g.Smokingisharmfultothehealth.吸烟有害健康。Playingcomputergamesmuchisharmfultostudents.电脑游戏玩太多对学生有害。,.,3.Sharksareatthetopofthefoodchainintheoceansecosystem.鲨鱼位于海洋生物系统食物链的顶部。,atthetopof在最高地位;用最高最大的(速度,声音等)e.g.Ilookedatthetopofhishead,hishairshinyandpartedsmoothly.我看他的头顶,头发闪亮且平滑的分开。,.,Heshoutedatthetopofhisvoiceinorderthathemightbeheard.他尽力大声叫喊,以便别人能听见。,.,4.Iftheirnumbersdroptoolow,itwillbringdangertoalloceanlife.如果它们的数目降至过低，会给所有海洋生物带来危险。此句复数形式的numbers表达全海洋中鲨鱼的总量。当表示数值的高或低时，number要用high或low修饰。,.,e.g.Inthatcountry,thenumberofchildrengoingtoschoolishigherincitiesthanintownsandvillage.在那个国家，城市儿童入学人数比乡镇及农村要高。常与number搭配的动词有grow,fall等。e.g.Thenumberoffamiliesthatowncarshasbeengrowingquicklyrecently.近来拥有轿车的家庭数量增长很快。,.,5.Environmentprotectiongroupsaroundtheworld,suchasWildAidandtheWWF,areteachingthepublicabout“finning”.世界各地的环境保护组织，如野生救援协会和世界自然基金会，都在教育公众有关“猎翅”的行为。1)句中fin本为名词，指“鱼鳍”。此句中的finning由动词化的fin（割鲨鱼鳍以获取鱼翅）的-ing形式转化而成，指课文中所陈述的“猎翅”这一行为。,.,2)WildAid和WWF组织WildAid（美国野生救援协会）是保护野生动物及栖息地环境的一个非盈利性的机构，1999年注册成立，其宗旨是保护及救助世界范围内的野生动物；WWF（世界自然基金会）英文全称为WorldWideFundforNature，成立于1961年，是享有国际盛誉，全球最大的独立性非政府环境保护组织之一。,.,Payattentiontothesentences.1.Weretryingtosavetheearth.2.Theriverusedtobesoclean.3.Theairisbadlypolluted.4.Noscientificstudieshaveshownthatsharkfinsaregoodforhealth.5.Weshouldhelpsavethesharks.,Presentprogressive,usedto,Passivevoice,Presentperfect,GrammarFocus,Modalverbs,.,现在进行时:PresentProgressive,结构:be(am/is/are)+v.-ing标志词：Look,Listen,now,rightnowe.g.Look!Theboyiscrying.,定义：表示说话时(瞬间)正在进行的动作,也表示目前或现阶段正在进行的动作。,.,Whatafinedaytoday!Look!Whataretheydoing?,Exercise,.,usedtodosth.表示过去常常做某事,而现在往往不做了,后接动词原形。beusedtodoingsth.表示习惯于做某事e.g.Iusedtogetupatsixoclock.Joeisusedtodrinkingacupofcoffeeeverymorning.,usedtodo与beusedtodoing,.,Translation.1.她过去常常周末和朋友闲逛。Sheusedtohangoutwithfriendsonweekends.2.他习惯于每天晚上睡得很晚。Heisusedtostayingup.,Exercise,.,被动语态：Passivevoice,定义：表示主语是动作的承受者，即行为动作的对象的一种语态。结构：be+过去分词e.g.Anewschoolwasbuiltlastyear.Ourclassroomiscleanedeveryday.,.,TranslatethesentencesbyusingPassivevoice.1.刚才一些老年人参观了博物馆。2.工人们使用不同种类的机器工作。,Themuseumwasvisitedbysomeoldpeoplejustnow.,Differentkindsofmachinesareusedtoworkbytheworkers.,Exercise,.,结构:has/have+过去分词标志词：already,yet,ever,never,since,fore.g.Ihaventfinishedmyhomeworkyet.,定义：表示动作已经完成,但对现在造成影响;或者表示从过去某一时间开始一直延续到现在并还可能持续下去的动作。,现在完成时:PresentPerfect,.,Completethefollowingsentences.I_(be)inBeijingfortwoyears.2.I_never_(hear)ofthatmanbefore.3.Tom_(work)theresincetwoyearsago.,havebeen,have,heard,hasworked,Exercise,.,4.Thetwins_(wash)theclothesforanhour.5.He_(play)basketballsincethreeyearsago.6.Howlong_Sally_(sing)yet?,havewashed,hasplayed,has,sung,.,1.情态动词本身有一定的词义,表示说话人的情绪、态度或语气,但不能单独作谓语,只能与其他动词构成谓语。常见的有:can(could),may(might),must,need,shall(should),will(would)等。,情态动词,.,2.情态动词无人称和数的变化,后接动词原形。否定式是在情态动词后面加not。个别情态动词有过去式形式,可用来表达更加客气、委婉的语气。e.g.Kencanclimbupthetresslikeakoala.Tracycouldrideabicyclewhenshewasfiveyearsold.Youmustntplaywithfire.Itisdangerous.,.,Translation.1.我们不能在教室里吃东西。2.首先你必须完成作业。3.他现在不可能在家。4.她一定知道这个问题的答案。,Exercise,Wecanteatintheclassroom.,Youmustfinishyourhomeworkfirst.,Hecantbeathomenow.,Shemustknowtheanswertothisquestion.,.,4a,Fillintheblankswiththecorrectformsoftheverbsinbrackets.,Joe:_youever_(take)partinanenvironmentalproject?Eric:Yes,Ihave.I_(help)withaClean-UpDaylastyear.Itwas_(consider)thebiggestclean-upprojectthiscity_ever_(have).,Have,taken,helped,considered,had,had,参加,.,Joe:Howmanypeople_(take)part?Eric:I_(think)morethan1,000people_(come)tohelpout.Joe:Thatsfantastic!Iguesseveryoneinthiscityis_(try)toimprovetheenvironment.Eric:Yes,wecantaffordto_(wait)anylongertotakeaction!,took,think,came,trying,wait,v.承担得起(后果);买得起,.,4b,Fillintheblankswiththeappropriatemodalverbsfromthebox.,People_thinkthatbigthings_bedonetosavetheearth.Manyforgetthatsavingtheearthbeginswithsmallthings.Forexample,you_save,may/might,must,can,canwouldcouldhavetoshouldmustmay/might,.,electricitybyturningoffthelightswhenyouleavearoom.You_alsousereusablebagsinsteadofplasticbags.Ithinkitsagreatideathatyounow_payforplasticbagsinsomestores.Andinsteadofdrivingtoschoolorwork,you_rideyourbikeorwalk.Ifitsfar,you_takethebus.Allthese,could,haveto,can/should,can/could,关掉,adj.可重复使用的,付费;付出代价,.,smallthings_addupandbecomebigthingsthat_improvetheenvironment.Letstakeactionnow!,could,would/can,采取行动,.,4c,Makealistofthingsthatpeoplecandotohelptheenvironmentanddiscussyourlistwithyourpartner.,usepublictransportation(n.交通运输);turnoffthelightswhenyouleavearoom;usereusablebagsinsteadofplasticbags;rideyourbikeorwalktoschoolorwork;stopusingpapernapkins(餐巾纸);recyclebooks