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1、Unit13Weretryingtosavetheearth第二课时第二课时(Focusongrammar)情境引入情境引入Leading-in判断下列句子中使用了什么判断下列句子中使用了什么时态及情态动词。时态及情态动词。1.Wearetryingtosavetheearth.2.Theriverusedtobesoclean.3.Itwasconsideredthenicestriverinthetown.4.Theairhasbecomereallypolluted.5.Weshouldhelpsavewthesharks.Answers:1.现在进行时现在进行时2.usedto3.一般
2、过一般过去时的被动语态去时的被动语态4.现在完成时现在完成时5.should活动探究活动探究FillintheblanksYoucandiscusswithyourparntersask现在在时过去去时将来将来时过去将来去将来时一一般般主主动语态被被动语态进行行主主动语态被被动语态完完成成主主动语态被被动语态Can/couldMay/mightmustshallwillShould/ought toAnswers:ask现在在时过去去时将来将来时过去将来去将来时一一般般主主动语态ask / asksaskedshall/will askshould/would ask 被被动语态am/is/a
3、re askedwas/were askedshall/will be askedshould/would be asked进行行主主动语态am/is/are askingwas/were asking被被动语态完完成成主主动语态have/has askedhad asked被被动语态have/has been askedhad been askedCan/could 表示能力，could主要指过去时间；表示允许。 May/mightmay表允许，might可以指过去时间，也可指现在时间，语气更委婉。 must表示义务。意为“必须”（主观意志） shall表征询意见will表意愿，用于各种人称
4、陈述句；表请求，用于疑问句 Should/ought to应该 延伸拓展延伸拓展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)moreth
5、an1,000people_(come)tohelpout.Interviewer:Thatsfantastic!Iguesseveryoneinthiscityis_(try)toimprovetheenvironment.Ken:Yes,evertoneshould_(play)apartinkeepingthecityclean.Possibleanswers:Havetaken,helped,considered,hadhad,took,think,came,trying,playFillinblankswithpropermodalverbs.canwouldcouldhavetos
6、houldmight/maymustWhenitcomestosavingtheearth,people_thinkthatbigthings_bedone.However,manyforgetthatsavingtheearthbeginswithsmallthings.Forexample,You_saveelectricitybyturningoffthelightswhenyouleavearoom.You_alsousepaperorreusablebagsinsteadofplasticbags.Insomestores,younow_payforplasticbags.Ithin
7、kthisisagreatidea.Andinsteadofdrivingtoschoolorwork,you_rideyourbikeorwalk.Ifitsfar,you_takethebus.Allthesesmallthings_addupandbecamebigthingsthat_improvetheenvironment.Wecantaffordtowaitanylongerbeforetakingaction.Possibleanswers:may,cant,can,could,haveto,may/might,should,would,must随堂练习随堂练习Fillinbl
8、anksusingproperformsofgivenwords.1、Illgivethebooktohimassoonashe_back(come).2、_thebaby_cryingyet?(stop)3、Idontknowwhethermother_metobeijingnextmonth.(take)4、she_onhercoatandwentout.(put)comesHavestoppedwilltakeput5、“Whataretheydoing?”“They_readyforthesportsmeeting.”(get)6、Theboyaskedhismother_himgoa
9、ndplaybasketball.(let)7、Imsorrytokeepyou_foralongtime.(wait)8、It_(take)himhalfanhour_(finish)hishomeworkyesterday.aregettingtoletwaitingtooktofinish9、Ifit_aninterestingfilm,wellseeittomorrow.(be)10、Theyusually_(do)theirhomeworkaftersupper.11、Listen!who_(sing)inthenextroomnow?12、_(be)yourparentsinsha
10、nghailastyear?isdoissingingWere13、Mr.yu_(teach)usmathssince1982.14、Theywillhaveatrip(旅行旅行)tothegreatwallifit_(notrain)tomorrow.15、LiMingoften_(listen)totheradiointhemorning.havetaughtdoesntrainlistensChoosethebestanswers.1-MayIstopmycarhere?-No,you_.A.cantB.mustntC.needntD.donthavetoA2.-Mustwecleant
11、hehousenow?-No,you_.A.needntB.maynotC.mustntD.cant3.Man_diewithoutwater.A.willB.canC.needD.shallAA4.You_returnthebooknow.Youcankeepitnextweekifyoulike.A.cantB.mustntC.needntD.maynot5.-Johnny,you_playwiththeknife,you_hurtyourself.A.wont.cantB.mustnt.mayC.shouldnt,mustD.cant.shouldntCB小结与作业小结与作业1.Lookbackonwhatwehavelearnedinthislesson.2.Homework:makeaconversationwithyourparnteraboutwhatyoucandotoreducepollution.
