38（九年级）Unit 13 We’re trying to save the earth（第2课时）（教案3）

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       Unit 13 We’re 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。

• 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[来源:学科网]
   1. To change forms of verb according to specific situation.[来源:学|科|网]
   2. To use Modal Verbs properly.

• 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。

• 教学准备
  

ppt， recorder， mutiple-media

• 教学环节
  

• 课堂导入[来源:学科网ZXXK]
  

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. should

• 课堂讲授
  

Step 2. Presentation
1) Review different forms of verb

ask	现在时	过去时	将来时	过去将来时
一般	主动语态[来源:Zxxk.Com]	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

2) Review Modal verbs.
Main function of Modal Verbs.
①. can (could) 表示能力，could主要指过去时间；表示允许。
②. may表允许，might可以指过去时间，也可指现在时间，语气更委婉。
③. must表示义务。意为“必须”（主观意志）
④. shall表征询意见
⑤. will表意愿，用于各种人称陈述句；表请求，用于疑问句。
⑥. should / ought to应该

• 课堂练习
  

Step 3 Exercises
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: That’s 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
2) 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 it’s far, you ________ take the bus. All these small things ______ add up and became big things that _____________ improve the environment. We can’t afford to wait any longer before taking action.
Possible answers: may, can’t, can, could, have to, may/might, should ,would, must

• 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)…

• 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 / does	did	shall/will do	should/would do
	被动语态	am/is/are done	was/were done	shall/will be done	should/would be done
进行	主动语态	am/is/are doing	was/were doing
	被动语态
完成	主动语态	have/has done	had done
	被动语态	have/has been done	had been done

  2）
①. can (could) 表示能力，could主要指过去时间；表示允许。
②. may表允许，might可以指过去时间，也可指现在时间，语气更委婉。
③. must表示义务。意为“必须”（主观意志）
④. shall表征询意见
⑤. will表意愿，用于各种人称陈述句；表请求，用于疑问句。
⑥. should / ought to应该

• 作业布置
  

Homework : Review this lesson and preview Section B.

• 板书设计
  

• 教学反思
  

  通过本课学习，学生们进一步了解了动词各种形势变化，及情态动词用法。