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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,Unit 13 Were trying to save the earth,第二课时,(Focus on grammar),情境引入,Leading-in,判断下列句子中使用了什么时态及情态动词。,1.We are trying to save the earth.,2.The river used to be so clean.,3.It was considered the nicest river in the town.,4.The air has become really polluted.,5.We should help,savew,the sharks.,Answers:,1.,现在进行时,2.used to 3.,一般过去时的被动语态,4.,现在完成时,5.should,活动探究,Fill in the blanks,You can discuss,with your,parnters,ask,现在时,过去时,将来时,过去将来时,一般,主动语态,被动语态,进行,主动语态,被动语态,完成,主动语态,被动语态,Can/could,May/might,must,shall,will,Should/ought to,Answers:,ask,现在时,过去时,将来时,过去将来时,一般,主动语态,ask/asks,asked,shall/will ask,should/would ask,被动语态,am/is/are asked,was/were asked,shall/will be asked,should/would be asked,进行,主动语态,am/is/are asking,was/were asking,被动语态,完成,主动语态,have/has asked,had asked,被动语态,have/has been asked,had been asked,Can/could,表示能力，,could,主要指过去时间；表示允许。,May/might,may,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，用于各种人称陈述句；表请求，用于疑问句,Should/ought to,应该,延伸拓展,Fill in blanks with the correct forms of verbs.,Interviewer:_ you ever _(take)part in an environmental project?,Ken:Yes,I have.I _(help)with a Clean-Up Day last year.It was _(consider)the biggest clean-up project this city _ ever _(have).,Interviewer:How many people _(take)part?,Ken:I _(think)more than 1,000 people _(come)to help out.,Interviewer:Thats fantastic!I guess everyone in this city is _(try)to improve the environment.,Ken:Yes,evertone,should _(play)a part in keeping the city clean.,Possible answers:,Have taken,helped,considered,had had,took,think,came,trying,play,Fill in blanks with proper modal verbs.,can would could have to should might/may must,When it comes to saving the earth,people _ think that big things _be done.However,many forget that saving the earth begins with small things.For example,You _ save electricity by turning off the lights when you leave a room.You _ also use paper or reusable bags instead of plastic bags.In some stores,you now _ pay for plastic bags.I think this is a great idea.And instead of driving to school or work,you _ ride your bike or walk.If its far,you _ take the bus.All these small things _ add up and became big things that _ improve the environment.We cant afford to wait any longer before taking action.,Possible answers:,may,cant,can,could,have to,may/might,should,would,must,随堂练习,Fill in blanks using proper forms of given words.,1,、,Ill give the book to him as soon as he _,back(come,).,2,、,_ the baby _ crying yet?(stop),3,、,I dont know whether mother_ me to,beijing,next,month.(take,),4,、,she _ on her coat and went out.(put),comes,Have,stopped,will take,put,5,、“,What are they doing?”“They_ ready for the sports meeting.”(get),6,、,The boy asked his mother_ him go and play,basketball.(let,),7,、,Im sorry to keep you _ for a long time.(wait),8,、,It _(take)him half an hour_(finish)his homework yesterday.,are getting,to let,waiting,took,to finish,9,、,If it _ an interesting film,well see it tomorrow.(be),10,、,They usually _(do)their homework after supper.,11,、,Listen!who_(sing)in the next room now?,12,、,_(be)your parents in shanghai last year?,is,do,is singing,Were,13,、,Mr.,yu,_(teach)us,maths,since 1982.,14,、,They will have a trip(,旅行,)to the great wall if it _(not rain)tomorrow.,15,、,Li Ming often_(listen)to the radio in the morning.,have taught,doesnt rain,listens,Choose the best answers.,1,-May I stop my car here?,-No,you_,.,A.cant B.mustnt C.neednt D.dont have to,A,2.-Must we clean the house now?,-No,you _.,neednt B.may not,C.mustnt D.cant,3.Man,_,die without water.,A.will B.can C.need D.shall,A,A,4.You_,return the book now.You can keep it next week if you like.,cant B.mustnt,C.neednt D.may not,5.-Johnny,you_,play with the knife,you_,hurt yourself.,wont.cant,B.mustnt.may,C.shouldnt,must,D.cant.shouldnt,C,B,小结与作业,1.Look back on what we have learned in this lesson.,2.Homework:make a conversation with your,parnter,about what you can do to reduce pollution.,
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