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

Unit 13 Were trying to save the earth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. 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.教学重点 1. To change forms of verb according to specific situation. 2. To use Modal Verbs properly.教学难点 1. To change forms of verb according to specific situation. 2. To use Modal Verbs properly.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 Step 1 Lead-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. should2、 课堂讲授Step 2. Presentation 1) Review different forms of verbask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) Review 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3、 课堂练习Step 3 Exercises1) 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 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 4、 课堂活动Step 4 Activities In your group make a list of things people can do to help the environment and present them. You can use following examples: 1) We should use public transportation. 2) we must save water. 3)5、 课堂小结Step 5. SummarizeLook back on what we have learned.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/will doshould/would do 被动语态am/is/are donewas/were doneshall/will be doneshould/would be done进行主动语态am/is/are doingwas/were doing被动语态完成主动语态have/has donehad done被动语态have/has been donehad been done 2） . 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6、 作业布置Homework : Rev