Unit8Weretryingtosavetheearth!1.不同种类的污染不同种类的污染2.河底河底3.把垃圾扔到河里把垃圾扔到河里4.在在中起作用中起作用differentkindsofpollutionthebottleoftheriverthrowrubbishintotheriverplayapartinI. Check if you know these phrases.5. 在中国南部在中国南部6. 对有害有害7. 在在顶部部8. 海洋生海洋生态系系统insouthernChinabeharmfulto atthetopoftheoceansecosystemII. Translate the sentences.II. Translate the sentences.1.甚至是河底都满是垃圾。甚至是河底都满是垃圾。2.这个方法不仅残酷还对环境有害。这个方法不仅残酷还对环境有害。Eventhebottomoftheriverwasfullofrubbish.Thismethodisnotonlycruel,butalsoharmfultotheenvironment.3. 鲨鱼处于海洋食物于海洋食物链的的顶部。部。4. 许多人相信多人相信鱼翅翅对健康有好健康有好处。Sharksareatthetopofthefoodchainintheoceansecosystem.Alotofpeoplebelievethatsharksfinsaregoodforhealth.Pay attention to the sentences.1. Were trying to save the earth.2. The river used to be so clean.3. The air is badly polluted.4. No scientific studies have shown that shark fins are good for health.5. We should help save the sharks.Present progressiveused toPassive voicePresent perfectModal verbs现在进行时现在进行时: :PresentProgressive结构结构:be(am/is/are)+v.-ing标志词：标志词：Look,Listen,now,rightnowe.g.Look!Theboyiscrying.定义：定义：表示说话时表示说话时(瞬间瞬间)正在进行的正在进行的动作动作,也表示目前或现阶段正也表示目前或现阶段正在进行的动作。在进行的动作。What a fine day today! Look! What are they doing?used to do sth. 表示表示过去常常做某事去常常做某事, 而而现 在往往不做了在往往不做了, 后接后接动词原原形。形。be used to doing sth. 表示表示习惯于做某事于做某事e.g. I used to get up at six oclock. Joe is used to drinking a cup of coffee every morning.usedtodo与与beusedtodoingTranslation.1. 她她过去常常周末和朋友去常常周末和朋友闲逛。逛。She used to hang out with friends on weekends.2. 他他习惯于每天晚上睡得很晚。于每天晚上睡得很晚。He is used to staying up.被动语态：被动语态：Passivevoice定义：定义：表示主语是动作的承受者，即行表示主语是动作的承受者，即行为动作的对象的一种语态。为动作的对象的一种语态。结构：结构：be+过去分词过去分词e.g.Anewschoolwasbuiltlastyear. Ourclassroomiscleanedeveryday.Translate the sentences by using Passive voice.1. 刚才一些老年人参才一些老年人参观了博物了博物馆。2. 工人工人们使用不同种使用不同种类的机器工作。的机器工作。Themuseumwasvisitedbysomeoldpeoplejustnow.Differentkindsofmachinesareusedtoworkbytheworkers.结构结构:has/have+过去分词过去分词标志词：标志词：already,yet,ever,never,since,fore.g.Ihaventfinishedmyhomeworkyet.定义：定义：表示动作已经完成表示动作已经完成,但对现在造成影但对现在造成影响响;或者表示从过去某一时间开始一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直延续到现在并还可能持续下去的动作。动作。现在完成时现在完成时:PresentPerfectComplete the following sentences.1.I_(be)inBeijingfortwoyears.2.I_never_(hear)ofthatmanbefore.3.Tom_(work)theresincetwoyearsago.havebeenhaveheardhasworked4.Thetwins_(wash)theclothesforanhour.5.He_(play)basketballsincethreeyearsago.6.Howlong_Sally_(sing)yet?havewashedhasplayedhassung1. 情情态动词本身有一定的本身有一定的词义, 表示表示说话人的情人的情绪、态度或度或语气气, 但不能但不能单独作独作谓语, 只能与其他只能与其他动词构成构成谓语。常常见的有的有: can (could), may (might), must, need, shall (should), will (would)等。等。情态动词情态动词2. 情情态动词无人称和数的无人称和数的变化化, 后接后接动词原形。否定原形。否定式是在情式是在情态动词后面加后面加not。个。个别情情态动词有有过去去式形式式形式, 可用来表达更加客气、委婉的可用来表达更加客气、委婉的语气。气。e.g. Ken can climb up the tress like a koala. Tracy could ride a bicycle when she was five years old. You mustnt play with fire. It is dangerous.Translation.1. 我我们不能在教室里吃不能在教室里吃东西。西。2. 首先你必首先你必须完成作完成作业。3. 他他现在不可能在家。在不可能在家。4. 她一定知道她一定知道这个个问题的答案。的答案。Wecanteatintheclassroom.Youmustfinishyourhomeworkfirst.Hecantbeathomenow.Shemustknowtheanswertothisquestion.4aFill in the blanks with the correct forms of the verbs in brackets.Joe:_youever_(take)partinanenvironmentalproject?Eric:Yes,Ihave.I_(help)withaClean-UpDaylastyear.Itwas_(consider)thebiggestclean-upprojectthiscity_ever_(have).Havetakenhelpedconsideredhadhad参加参加Joe:Howmanypeople_(take)part?Eric:I_(think)morethan1,000people_(come)tohelpout.Joe:Thatsfantastic!Iguesseveryoneinthiscityis_(try)toimprovetheenvironment.Eric:Yes,wecantaffordto_(wait)anylongertotakeaction!tookthinkcametryingwaitv. 承担得起承担得起( (后果后果) );买得起买得起4bFill in the blanks with the appropriatemodal verbs from the box.People_thinkthatbigthings_bedonetosavetheearth.Manyforgetthatsavingtheearthbeginswithsmallthings.Forexample,you_savemay/mightmustcancanwouldcouldhavetoshouldmustmay/mightelectricitybyturningoffthelightswhenyouleavearoom.You_alsousereusablebagsinsteadofplasticbags.Ithinkitsagreatideathatyounow_payforplasticbagsinsomestores.Andinsteadofdrivingtoschoolorwork,you_rideyourbikeorwalk.Ifitsfar,you_takethebus.Allthese couldhavetocan/shouldcan/could关掉关掉adj.可重复使用的可重复使用的付费付费;付出代价付出代价small things _ add up and become big things that _ improve the environment. Lets take action now!couldwould/can采取行动采取行动4cMake a list of things that people can do to help the environment and discuss your list with your partner.use public transportation (n.交通运输交通运输);turnoffthelightswhenyouleavearoom;usereusablebagsinsteadofplasticbags;rideyourbikeorwalktoschoolorwork;stopusingpapernapkins(餐巾纸餐巾纸);recyclebooksandpaperIthinkthateveryoneshouldusepublictransportation.Idisagree.Itsdifficultforparentswithyoungchildrentousepublictransportation1.Wecantaffordtowaitanylongertotakeaction!affordv.承担得起承担得起;提供提供,给予给予affordtodosth.(常与常与can,beableto连用连用)买得起买得起;有足够的有足够的e.g.Wecantaffordtopaysuchaprice.我们付不起这个价钱。我们付不起这个价钱。Dancingaffordsuspleasure.跳舞给我们带来快乐。跳舞给我们带来快乐。2. save electricity by turning off the lights when you leave a room. turn off 关掉关掉e.g. Please turn the television off before you go to bed. 睡睡觉前前请关掉关掉电视。turn around 转身身 turn up 调高高(音量音量)turn down 调低低; 拒拒绝turn into 变成成; 进入入 turn on 打开打开, 发动 turn off 关掉关掉, 关关闭turn out to be 结果是果是turn over 移交移交拓展拓展:turn相关短语相关短语Finish the exercises in the workbook.