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1、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differentkindsofpollutionthebottomoftheriverthrowrubbishintotheriverplayapartinI.Check if you know these phrases.5.在中国南部在中国南部6.对对有害有害7.在在顶部顶部8.海洋生态系统海洋生态系统insouthernChinabeharmfulto atthetopoftheoceansecosystemPay attention to the sentences.1.Weretry
2、ingtosavetheearth.2.Theriverusedtobesoclean.3.Theairisbadlypolluted.4.Noscientificstudieshaveshownthatsharkfinsaregoodforhealth.5.Weshouldhelpsavethesharks.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,r
3、ightnowe.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?usedtodosth.表示过去常常做某事表示过去常常做某事,而而现在往往不做了现在往往不做了,后接动后接动词原形。词原形。beusedtodoingsth.表示表示习惯于做某事习惯于做某事e.g.Iusedtogetupatsixoclock.Joeisusedtodrinkingacupofcof
4、feeeverymorning.usedtodo与与beusedtodoingTranslation.1.她过去常常周末和朋友闲逛。她过去常常周末和朋友闲逛。Sheusedtohangoutwithfriendsonweekends.2.他习惯晚睡。他习惯晚睡。Heisusedtostayingup.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.Ourclassroomiscleaned
5、everyday.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,但对现在造成但对现在造成影响影响;或者表示从过去某一时间开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始一直延续到现在并还可能持续下去的动作。下去的动作。现在完成时现在完成时:PresentperfectComplete the following sentences.1.I_(be)inBeijingfortwoyears.2.I_n
6、ever_(hear)ofthatmanbefore.3.Tom_(work)theresincetwoyearsago.havebeenhaveheardhasworked1.情态动词本身有一定的词义情态动词本身有一定的词义,表示说表示说话人的情绪、态度或语气话人的情绪、态度或语气,但不能单但不能单独作谓语独作谓语,只能与其他动词构成谓语。只能与其他动词构成谓语。常见的有常见的有:can(could),may(might),must,need,shall，should,will(would)等。等。情态动词情态动词2.情态动词无人称和数的变化情态动词无人称和数的变化,后接动词后接动词原形。否
7、定式是在情态动词后面加原形。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个别情态动词有过去式形式,可用来表可用来表达更加客气、委婉的语气。达更加客气、委婉的语气。e.g.Kencanclimbupthetresslikeakoala.Tracycouldrideabicyclewhenshewasfiveyearsold.Youmustntplaywithfire.Itisdangerous.1.Mum,_Iplaythecomputergameforawhile?Imafraidyouhavetofinishyourhomeworkfirst.(2016四川攀枝花四川攀枝花)A.
8、mustB.needC.willD.mayD2.Manypeopleplaywithmobilephonesalldayinsteadofreadingbooks.Thatstoobad.Everyone_beabooklover.Readingismoreenjoyable.(2016山西山西)A.mayB.shouldC.wouldB3.IsthatmanMr.Green?It_behim.HehasgonetoParisonbusiness.(2016江苏盐江苏盐城城)A.mayB.mustC.cantD.shouldntC4.Iusedto_newspapersandwatchTVaf
9、terdinner.ButnowImusedto_awalk.(2016新疆新疆生产建设兵团生产建设兵团)A.read;takeB.read;takingC.reading;takingD.reading;takeB5.Look!Adog_ablindmanacrosstheroad.(2016云南昆明云南昆明)A.leadsB.leadC.isleadingD.led6.UncleLiang_inHaikousince1980,soheknowsalotaboutthecity.(2016海南海南)A.islivingB.haslivedC.livedCB7.Football_tooursc
10、hoolsubjectslastyear.(2016陕西陕西)A.isaddedB.addsC.wasaddedD.addedC8.Tomisalwayscarelesswithhisschoolwork.Couldyouhelphim?Noproblem!Ithinkhe_tothinktwicebeforestarting.(2016湖北黄冈湖北黄冈)A.shouldbetoldB.cantellC.shouldtellD.canbetellingA4aFill in the blanks with the correct forms of the verbs in brackets.Jo
11、e:_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!Iguessevery
12、oneinthiscityis_(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.Manyforgetthatsavingtheearthbeginswithsmallt
13、hings.may/mightmust/havetocanwouldcouldhavetoshouldmustmay/mightForexample,you_saveelectricitybyturningoffthelightswhenyouleavearoom.You_alsousereusablebagsinsteadofplasticbags.can/could/shouldcanwouldcouldhavetoshouldmustmay/mightcould/can/shouldreusable adj.可重复使用的可重复使用的Ithinkitsagreatideathatyouno
14、w_payforplasticbagsinsomestores.Andinsteadofdrivingtoschoolorwork,you_rideyourbikeorwalk.Ifitsfar,you_takethebus.havetopayfor 付费付费;付出代价付出代价can/should/couldcan/couldcanwouldcouldhavetoshouldmustmay/mightAllthese smallthings_addupandbecomebigthingsthat_improvetheenvironment.Letstakeactionnow!can/could
15、would/can/could采取行动采取行动canwouldcouldhavetoshouldmustmay/might4cMake 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;rideyourbikeorwalktoscho
16、olorwork;stopusingpapernapkins(n.餐巾纸餐巾纸);recyclebooksandpaperIthinkthateveryoneshouldusepublictransportation.Idisagree.Itsdifficultforparentswithyoungchildrentousepublictransportation1.Wecantaffordtowaitanylongertotakeaction!affordv.承担得起承担得起;买得起；提供买得起；提供,给予给予常与常与can,beableto连用连用affordsth.买得起买得起/承受得起
17、某物承受得起某物affordtodosth.有能力做某事有能力做某事/负担得起负担得起做某事做某事e.g.Canyouaffordthemobilephone?Wecantaffordtopaysuchaprice.afford&buyafford侧重侧重“有经济能力买有经济能力买”，而，而buy则则侧重侧重“购买购买(这一行为这一行为)”。表示表示“我买不起我买不起”可以说可以说Icantafford.，但不能说，但不能说Icantbuy.。根据句意，用根据句意，用afford或或buy的适当形式填的适当形式填空。空。1)Theycant_tosendtheirchildrentocolle
18、ge.2)Canyou_anewcar?3)Helen_somefruitonherwayhomeyesterday.affordaffordbuy2.saveelectricitybyturningoffthelightswhenyouleavearoom.turnoff关掉关掉e.g.Pleaseturnthetelevisionoffbeforeyougotobed.睡觉前请关掉电视。睡觉前请关掉电视。turnon打开打开,发动发动turnaround转身转身turnup调高调高(音量音量)turndown调低调低;拒绝拒绝turninto变成变成;进入进入turnover移交移交拓展拓展:turn相关短语相关短语Finish the exercises in the workbook.