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1、Welcome everybody !air pollutionwater pollutionnoise pollutionLookatthesentencescarefullyandnamethetenseswelearnedbefore.1.Youarelisteningtomecarefully.2.Theoldmanusedtoliveinthecountryside.3.Theclassroomiscleanedbythestudentseveryday.4.WehavealreadyfinishedUnit12.WehaventfinishedUnit13yet.5.Student
2、sshouldhandinhomeworkontime.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 voiceP
3、resent 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)正在进行正在进行的动作的动作,也表示目前或现阶也表示目前或现阶段正在进行的动作。段正在进行的动作。What a fine day today! Look! What are they doing?used to do sth. 表示过去常常做某事表示过去常常做某事, 而而现现 在往
4、往不做了在往往不做了, 后接动词后接动词原原 形。形。be used to doing sth. 表示习惯于做某事表示习惯于做某事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. 她过去常常周末和朋友闲逛。她过去常常周末和朋友闲逛。 She used to hang out with friends on weekends.2. 他习惯于每天晚上睡得很晚。他习惯于每天晚上睡得很晚。 He
5、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. 刚才一些老年人参观了博物馆。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。工人们使用不同种类的机器工作。Themuseu
6、mwasvisitedbysomeoldpeoplejustnow.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:Presen
7、tPerfectComplete the following sentences.1.I_(be)inBeijingfortwoyears.2.I_never_(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), m
8、ust, have to, 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. Ken can climb up the tress like a koala. Tracy could ride a bicycle when she was five years old. You mustnt pla
9、y with fire. It is dangerous.Translation.1. 我们不能在教室里吃东西。我们不能在教室里吃东西。2. 首先你必须完成作业。首先你必须完成作业。3. 他现在不可能在家。他现在不可能在家。Wecanteatintheclassroom.Youmustfinishyourhomeworkfirst.Hecantbeathomenow.4aFill in the blanks with the correct forms of the verbs in brackets.Joe:_youever_(take)partinanenvironmentalprojec
10、t?Eric:Yes,Ihave.I_(help)withaClean-UpDaylastyear.Itwas_(consider)thebiggestclean-upprojectthiscity_ever_(have).HavetakenhelpedconsideredhadhadJoe:Howmanypeople_(take)part?Eric:I_(think)morethan1,000people_(come)tohelpout.Joe:Thatsfantastic!Iguesseveryoneinthiscityis_(try)toimprovetheenvironment.Eri
11、c:Yes,wecantaffordto_(wait)anylongertotakeaction!tookthinkcametryingwait4bFill in the blanks with the appropriatemodal verbs from the box.People_thinkthatbigthings_bedonetosavetheearth.Manyforgetthatsavingtheearthbeginswithsmallthings.Forexample,you_savemay/mightmustcancanwouldcouldhavetoshouldmustm
12、ay/mightelectricitybyturningoffthelightswhenyouleavearoom.You_alsousereusablebagsinsteadofplasticbags.Ithinkitsagreatideathatyounow_payforplasticbagsinsomestores.Andinsteadofdrivingtoschoolorwork,you_rideyourbikeorwalk.Ifitsfar,you_takethebus.Allthese couldhavetocan/shouldcan/couldsmall things _ add
13、 up and become big things that _ improve the environment. Lets take action now!couldwould/can4cMake 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);Ithinkthateveryoneshouldusepublictransportation.Idisagree.Its
14、difficultforparentswithyoungchildrentousepublictransportationWhat should we do to save the earth?Turn off the lights when you leave a room.关掉关掉stop riding in carsstop using paper towels or napkins（餐巾，餐巾纸）（餐巾，餐巾纸）recycle books and paper回收利用回收利用Inthisperiod,wemainlyreviewedthegrammarstructurewelearnedinthelastunitsandconsolidatedthetargetlanguageinthisunitthroughthepractice.Besideswealsodevelopedourspeakingandwritingskills.Meanwhileweknowhowtoprotecttheenvironment.Write a short passage about how to protect the environment .
