Unit13We’retryingtosavetheearth教材分析本单元带领学生了解了一些有关地球污染，动物濒危等问题。并且教给大家如何保护濒危动物，如何通过回收利用等方式来保护地球。本单元主要复习语法内容为情态动词和动词形式变化。本课主要带领大家进行语法复习，巩固语法知识。一、三维目标(一)知识与技能1.Tolearndifferentformsofverb.2.TounderstandtheuseofModalVerbs.(二)过程和方法3.Toknowhowtousedifferentformsofverbindifferentsituations.4.ToknowhowtouseModalVerbsindifferentsituations.(三)情感态度和价值观5.Afterlearningthispart,everystudentwillbeabletodescribetheirawarenessoftheserioussituationofpullutionandsolutionstoenvironmentalproblemsusingwhatwehavelearnedinthislesson.教学重点1.Tochangeformsofverbaccordingtospecificsituation.2.TouseModalVerbsproperly.教学难点[来源:学科网]1.Tochangeformsofverbaccordingtospecificsituation.[来源:学|科|网]2.TouseModalVerbsproperly.二、教学策略根据本课教学目标和重点内容，教师可采用读，小组讨论，口头及书面练习等活动来引导学生进行学习。三、教学准备ppt，recorder，mutiple-media四、教学环节1、课堂导入[来源:学科网ZXXK]Step1Lead-in判断下列句子中使用了什么时态及情态动词。1.Wearetryingtosavetheearth.2.Theriverusedtobesoclean.3.Itwasconsideredthenicestriverinthetown.4.Theairhasbecomereallypolluted.5.Weshouldhelpsavewthesharks.Answers:1.现在进行时2.usedto3.一般过去时的被动语态4.现在完成时5.should2、课堂讲授Step2.Presentation1)Reviewdifferentformsofverbask现在时过去时将来时过去将来时一般主动语态[来源:Zxxk.Com]ask/asksaskedshall/willaskshould/wouldask被动语态am/is/areaskedwas/wereaskedshall/willbeaskedshould/wouldbeasked进行主动语态am/is/areaskingwas/wereasking被动语态完成主动语态have/hasaskedhadasked被动语态have/hasbeenaskedhadbeenasked2)ReviewModalverbs.MainfunctionofModalVerbs.①.can(could)表示能力，could主要指过去时间；表示允许。②.may表允许，might可以指过去时间，也可指现在时间，语气更委婉。③.must表示义务。意为“必须”（主观意志）④.shall表征询意见⑤.will表意愿，用于各种人称陈述句；表请求，用于疑问句。⑥.should/oughtto应该1、课堂练习Step3Exercises1)Fillinblankswiththecorrectformsofverbs.Interviewer:___________youever________(take)partinanenvironmentalproject?Ken:Yes,Ihave.I___________(help)withaClean-UpDaylastyear.Itwas_________(consider)thebiggestclean-upprojectthiscity__________ever___________(have).Interviewer:Howmanypeople__________(take)part?Ken:I________(think)morethan1,000people________(come)tohelpout.Interviewer:That’sfantastic!Iguesseveryoneinthiscityis____________(try)toimprovetheenvironment.Ken:Yes,evertoneshould_____________(play)apartinkeepingthecityclean.Possibleanswers:Havetaken,helped,considered,hadhad,took,think,came,trying.,play2)Fillinblankswithpropermodalverbs.Canwouldcouldhavetoshouldmight/maymustWhenitcomestosavingtheearth,people_______thinkthatbigthings__________bedone.However,manyforgetthatsavingtheearthbeginswithsmallthings.Forexample,You_________saveelectricitybyturningoffthelightswhenyouleavearoom.You____alsousepaperorreusablebagsinsteadofplasticbags.Insomestores,younow__________payforplasticbags.Ithinkthisisagreatidea.Andinsteadofdrivingtoschoolorwork,you________rideyourbikeorwalk.Ifit’sfar,you________takethebus.Allthesesmallthings______addupandbecamebigthingsthat_____________improvetheenvironment.Wecan’taffordtowaitanylongerbeforetakingaction.Possibleanswers:may,can’t,can,could,haveto,may/might,should,would,must1、课堂活动Step4ActivitiesInyourgroupmakealistofthingspeoplecandotohelptheenvironmentandpresentthem.Youcanusefollowingexamples:1)Weshouldusepublictransportation.2)wemustsavewater.3)…2、课堂小结Step5.SummarizeLookbackonwhatwehavelearned.1）动词的各种时态语态的变形。do现在时过去时将来时过去将来时一般do/doesdidshall/willdoshould/woulddo被动语态am/is/aredonewas/weredoneshall/willbedoneshould/wouldbedone进行主动语态am/is/aredoingwas/weredoing被动语态完成主动语态have/hasdonehaddone被动语态have/hasbeendonehadbeendone2）①.can(could)表示能力，could主要指过去时间；表示允许。②.may表允许，might可以指过去时间，也可指现在时间，语气更委婉。③.must表示义务。意为“必须”（主观意志）④.shall表征询意见⑤.will表意愿，用于各种人称陈述句；表请求，用于疑问句。⑥.should/oughtto应该1、作业布置Homework:ReviewthislessonandpreviewSectionB.一、板书设计Unit13We’retryingtosavetheearth1.被动语态的构成2.情态动词：①.can(could)②.may③.must④.shall⑤.will⑥.should/oughtto4.二、教学反思通过本课学习，学生们进一步了解了动词各种形势变化，及情态动词用法。