unit 13 we’re trying to save the earth（第2课时）学案

Unit 13 Were trying to save the earth 【学习目标】(一) 知识与技能 1. To learn different forms of verb.2. To understand the use of Modal Verbs.(二) 过程和方法 3.To know how to use different forms of verb in different situations. 4. To know how to use Modal Verbs in different situations. (三) 情感态度和价值观 5. After learning this part, every student will be able to describe their awareness of the serious situation of pullution and solutions to environmental problems using what we have learned in this lesson.【自主梳理】1. 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.2. presentation1) verb forms现在时过去时将来时过去将来时一般主动语态ask / asksaskedshall/will askshould/would ask 被动语态am/is/are askedwas/were askedshall/will be askedshould/would be asked进行主动语态am/is/are askingwas/were asking被动语态完成主动语态have/has askedhad asked被动语态have/has been askedhad been asked2) Modal verbs.Main function of Modal Verbs. can (could) 表示能力，could主要指过去时间；表示允许。 . 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【重点领悟】1) 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., play2) Fill in blanks with proper modal verbs. Can would could have to should might/may mustWhen 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【探究提升】一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)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.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?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.二Choose the best answers.1-May I stop my car here?-No, you_.A. cant B. mustnt C. neednt D. dont have to2. -Must we clean the house now?-No, you _.A. neednt B. may not C. mustnt D. cant3. Man _die without water.A. will B. can C. need D. shall4. 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.shouldntAnswers: 【自主梳理】 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【重点领悟】1) Have taken, helped, considered, had had, took, think, came, trying., play2) may, cant, can, could, have