Unit_132_We’re_trying_to_save_the_earth.ppt

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1、Unit 13 Were trying to save the earth 第二课时第二课时( Focus on grammar)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. 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 hel

2、p savew the sharks.Answers:1. 现在进行时现在进行时 2. used to 3. 一般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Fill in the blanksYou can discuss with your parntersask现在时现在时过去时过去时将来时将来时过去将来时过去将来时一一般般主动语主动语态态被动语被动语态态进进行行主动语主动语态态被动语被动语态态完完成成主动语主动语态态被动语被动语态态Can/couldMay/mightmustshallwillShould/ought toAnsw

3、ers:ask现在时现在时过去时过去时将来时将来时过去将来时过去将来时一一般般主动语主动语态态ask / asksaskedshall/will askshould/would ask 被动语被动语态态am/is/are askedwas/were askedshall/will be askedshould/would be asked进进行行主动语主动语态态am/is/are askingwas/were asking被动语被动语态态完完成成主动语主动语态态have/has askedhad asked被动语被动语态态have/has been askedhad been askedCan

4、/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，用于各种人称陈述句；表请求，用于疑问句 Should/ought to应该 延伸拓展延伸拓展Fill in blanks with the correct forms of verbs.Interviewer: _ you ever _ (take ) part in an environmental project?Ken: Yes, I have. I _ (he

5、lp ) 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 t

6、he 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, playFill in blanks with proper modal verbs. can would could have to should might/may mustWhen it comes to saving the earth, people _

7、 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

8、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

9、, can, could, have to, may/might, should ,would, must 随堂练习随堂练习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. (

10、put)comesHavestoppedwill takeput 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 gettingto letwai

11、tingtookto 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?isdois singingWere 13、Mr. yu _ (teach) us maths since 1982.14、They will have a tr

12、ip (旅行旅行) to the great wall if it _ (not rain) tomorrow. 15、Li Ming often _ (listen) to the radio in the morning.have taughtdoesnt rainlistensChoose the best answers.1-May I stop my car here?-No, you_.A. cant B. mustnt C. neednt D. dont have toA2. -Must we clean the house now?-No, you _.A.neednt B.

13、may not C. mustnt D. cant3. Man _die without water.A. will B. can C. need D. shallAA4. You_ return the book now. You can keep it next week if you like.A.cant B. mustnt C. neednt D. may not5. -Johnny, you_ play with the knife, you_ hurt yourself.A.wont.cant B. mustnt.mayC. shouldnt, must D. cant.shouldntCB小结与作业小结与作业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.