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1、Unit3 We are trying to save the earth!教案Unit 13 Were trying to save the earth! 一、教学目标： 1. 语言知识目标 基本词汇：litter, advantage, bottom, fisherman, coal, ugly, cost, wooden, plastic, takeaway, bin, shark, fin, method, cruel. Harmful, chain, ecosystem, industry, law, scientific, afford, reusable, transportat
2、ion, recycle, napkin, upside, gate, bottle, president, inspiration, iron, work, metal, creativity, 基本词组：be harmful to, at the top(of sth.), take part in, turn off, take action, throw away, put sth. to good use, pull down, bring back 基本句型：Were trying to save the earth! The river used to be so clean.
3、The air is badly polluted. No scientific studies have showed that shark fins are good for health. We should help save the sharks. 2. 技能目标: 能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。 3. 情感目标: 有环境危机意识，学会关注环境保护环境。 二、教学重难点： 1. 教学重点：能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。 保护环境的措施方法。 2. 教学难点：能正确运用现在进行时，现在完成时，被
4、动语态，情态动词和used to 句型。 三、教学步骤: Section A 1 (1a-2d) I. Presentation Show the picture of the earth and tell students the earth is polluted now. For example: (1) The factories that burn coal pollute the air with a lot of black smoke. (2) Factories put waste into the river. (3) People should throw away li
5、tter in the bin. (4)There are more cars on the road. Learn some new words. II. Work on 1a Here are some words related to different kinds of pollution. Write them in the box below. Then add more words. loud music cars rubbish planes littering ships factories smoking building houses mobile phones nois
6、e pollution air pollution water pollution _ _ _ _ _ _ _ _ _ _ _ _ III. Listening 1. Work on1b. Listen and complete the sentences. What was the problem? The river was _. Even the bottom (底部) of the river was full of _. There were no more _ for fishermen (渔民) to catch. What caused the problem? People
7、are throwing _ into the river. Factories are putting _ into the river. How should the problem be solved? We should write to the _ and ask them to _ the factories. Everyone should help to _ the river. 2. Listen again and answer the following questions. 1) What does Tony want to do later this afternoo
8、n? He wants to go swimming with Mark in the river later this afternoon. 2) Why doesnt Mark want to go with Tony? Because the river was really dirty. Even the bottom of the river was full of rubbish, and there were no more fish for fishermen to catch. 3) How was the river in the past? It used to be s
9、o clean. It has been the nicest river in this town. IV. Practice 1. Role-play the conversation in 1c. Mark: The river was dirty. Even the bottom of the river was full of rubbish. Tony: But it used to be so clean! Mark: Yes, but people are throwing litter into the river. Tony: Everyone in this town s
10、hould play a part in cleaning it up! 2. Make conversations using the pollution in 1a. A: The river has always been the nicest river in this town. B: Yes, it used to be so clean. A: But I was there last weekend and the river was really dirty. B: What caused the problem? A: People are throwing litter
11、into the river. B: What should we do? A: Factories are also putting waste into the river. B: Yes, everyone in this town should play a part. A: We should write to the government and ask them to close down the factories. B: What else can we do? A: Everyone should help to clean up the river. V. Languag
12、e points 1. Were trying to save the earth! 我们正在竭尽全力拯救地球! try to do =try ones best to do 努力去做某事。 e.g. Well try to finish the work in a week. 我们将努力在一周内完成这项工作。 2. Here are some words related to different kinds of pollution. be related to 与有关 e.g.Is the driver relate to the accident? 司机和这起事故有关吗？ 3. .Eve
13、n the bottom of the river was full of rubbish. Yes, but people are throwing litter into the river. litter 和 rubbish 都可指“垃圾”，用作不可数名词。 rubbish 指“没用的东西(被扔或将要丢弃的无用的东西)”不可回收。 litter 指“(室内或公共场所)乱扔的废物(纸屑、不要的包装纸、废瓶等)”还可回收 e.g. Throw the rubbish out. 把垃圾扔出去。 The room is full of rubbish. 房间里堆满了垃圾。 Pick up you
14、r litter after a picnic. 野餐后将废弃物收拾好。 VI. Listening 1. Work on 2a. Listen to the interview. Circle the kinds of pollution that Jason and Susan talk about. A. land pollution B. air pollution C. noise pollution D. water pollution 2. Work on 2b. Listen again and complete the sentences. 1) The air is bad
15、ly polluted because there are _ on the road these days. 2) Factories that burn coal also _ the air with a lot of black smoke. 3) There is also too much rubbish and waste. People _ things every day. 4) People are also littering in _ like parks. This is turning beautiful places into ugly (丑陋) ones. VI
16、I. Practice (Work on 2c) Use the information in 2a and 2b to role-play conversations between Jason and Susan. Jason: The air has become really polluted around here. Im getting very worried. Susan: Yes, I used to be able to see stars in the sky. Jason: The problem is that VIII. Discussion Ask student
17、s what we should do to save the earth. Help students answer, turn off the lights when you leave a room; stop riding in cars; stop using paper towels or napkins; recycle books and paper. IX. Reading 1. Read 2d and complete the chart. Problems air pollution waste pollution Solving problems wooden (木头的
18、) chopsticks or plastic forks rubbish 2. Role-play the conversation. Interviewer: Jason and Susan, what are your ideas for solving these problems? Jason: Well, to cut down air pollution, we should take the bus or subway instead of driving. Susan: Yeah, or ride a bike. There are other advantages (优点)
19、 of bike riding. Its good for health and it doesnt cost (花费) anything! Interviewer: Great ideas! What about waste pollution? Susan: Mmm, I think simple things like bringing a bag to go shopping can help. I started doing that a year ago. Jason: Me, too. Also, I never take wooden chopsticks or plastic
20、 (塑料) forks when I buy takeaway (外卖食品) food. I use the ones at home. Susan: And remember to throw rubbish in the bins and keep public places clean and beautiful for everyone. Interviewer: So together, our actions can make a difference and lead to a better future! X. Language points 1. Its good for h
21、ealth and it doesnt cost anything! cost v. 花费；使付出 指花费金钱，主语通常是物。cost的过去式和过去分词均为cost。 e.g. The new shirt cost Mr Wang 200 yuan. 王先生花了200元买了新衬衫。 How much does the new computer cost? 新电脑花了多少钱？ 辨析 take, spend, pay & cost take，spend，pay和cost都可以表示“花费”，但它们的用法各有不同。 1) take多表示花费时间，常用于It takes sb. some time to
22、 do sth.这一句型中，其中it作形式主语。 e.g. It usually takes me 40 minutes to cook the dinner. 2) spend多表示花费时间和金钱，主语通常是人，常用于sb. spend(s) some time / money on sth.和sb. spend(s) some time / money (in) doing sth.两种句型。 e.g. David spent 2,000 yuan on the new machine. My father spends an hour (in) watching the news on
23、TV every day. 3) pay多表示花费金钱，主语通常是人，常用于sb. pay(s) some money for sth.句型。 e.g. Tommy paid 20 yuan for his breakfast yesterday. 4) cost多表示花费金钱，主语通常是物，常用于sth. cost(s) (sb.) some money. 句型。 e.g. The new dress cost Linda 80 yuan. 根据句意用take, spend, pay或cost的适当形式填空。 1) That new car _ them lots of money. 2)
24、Mona _ 50 yuan on the books just now. 3) It usually _ me an hour to do my homework. 4) You should _ some time practising your pronunciation. 5) My brother _ 6, 000 yuan for the new computer yesterday. 2. So together, our actions can make a difference and lead to a better future! make a difference (t
25、o) 表示(对)产生影响或作用 e.g. Learning English well can make a difference to your future. 学好英语会对你的前途有影响。 XI.Think about The earth is badly polluted. Please make a poster and think of what we can do. Homework 1. Copy the new words and remember them. 2. Read the listening materials of 1b, 2a. Section A 2 (3a-3
26、c) I. Revision Translation. 甚至是河底都满是垃圾。 这个小镇上的每个人都应该参加打扫。 骑自行车有其它的优点。 我买外卖食品从来不拿木筷子和塑料叉子。 II. Warming up 1. T: The earth is badly polluted. What should we do to save the earth? Lets take action. For example: Turn off the lights when you leave a room; Take buses instead of driving cars Recycle books
27、and paper. 2. There are some animals are endangered. We should do something to protect the animals and the environment! III. Discussion 1. What do you know about shark(鲨鱼)? 2. Do you think sharks can be endangered? Why? 3. What do you think might cause a fall in the number of sharks? IV. Reading 1.
28、Complete the fact sheet in 3a. Where shark fin soup is popular Number of sharks caught and traded every year How much the numbers of some kinds of sharks have fallen in the last 20 to 30 years Two environmental groups which are against “finning” 2. Retell the passage. sharks fin soup, in southern Ch
29、ina each time cut off no longer not onlybut also at the top drop be endangered the strongest around 70 million fallen by over 90 percent WildAid and the WWF develop laws scientific studies V. Practice (Work on 3b) Read the passage and fill in the blanks with the words in the box. 1) Many people do n
30、ot realize they are killing a whole shark _ they enjoy a bowl of shark fin soup. 2) Sharks are at the top of the food chain, _ if their numbers drop, the oceans ecosystem will be in danger. 3) Many think that sharks are too strong to be endangered, _ they are wrong. 4) _ there are no scientific stud
31、ies to support this, a lot of people believe that shark fins are good for health. 5) Sharks may disappear one day _ we do not do something to stop the sale of shark fins. VI. Language points 1. A shark can no longer swim and slowly dies. 鲨鱼不能再游泳然后慢慢死掉。 no longer意思是“不再”, 相当于not any longer。 e.g.Mr Bro
32、wn no longer works here. 布朗先生不再在这里工作了。 2. This method is not only cruel, but also harmful to the environment. 这种方法不但残忍而且对环境有害。 not onlybut also 用于连接两个表示并列关系的成分，着重强调后者，其意为“不仅而且”; 其中的also有时可以省略。 e.g. 1) She not only plays well, but also writes music. 她不仅很会演奏，而且还会作曲。 2) Not only men but also women were
33、 chosen. 不仅仅是男的，女的也有被选中的。 若连接两个成分作主语，其谓语通常与靠近的主语保持一致。 e.g. Not only you but also he has to leave. 不只是你，他也得离开。 not only放在句首，后接句子时要用倒装结构。 e.g. Not only had the poor man been fined, but also he had been sent to prison. 这个可怜的人不仅被罚款，而且还被送进了监狱。 be harmful to 对 有害 e.g. Smoking is harmful to the health. 吸烟有
34、害健康。 Playing computer games much is harmful to students. 电脑游戏玩太多对学生有害。 3. Sharks are at the top of the food chain in the oceans ecosystem. 鲨鱼位于海洋生物系统食物链的顶部。 at the top of 在.最高地位; 用最高最大的(速度, 声音等) e.g. He shouted at the top of his voice in order that he might be heard. 他尽力大声叫喊, 以便别人能听见。 4. If their nu
35、mbers drop too low, it will bring danger to all ocean life. 如果它们的数目降至过低，会给所有海洋生物带来危险。 此句复数形式的number表达全海洋中鲨鱼的总量。当表示数值的高或低时，number要用high或low修饰。 e.g. In that country, the number of children going to school is higher in cities than in towns and village. 在那个国家，城市儿童入学人数比乡镇及农村要高。 常与number搭配的动词有grow, fall等。
36、 e.g. The number of families that own cars has been growing quickly recently. 近来拥有轿车的家庭数量增长很快。 Homework Write 5 measures to protect the environment. Section A 3 (Grammar Focus-4c) I. Revision 1. Check if you know these phrases. 不同种类的污染 河底 把垃圾扔到河里 在中起作用 在中国南部 对有害 在顶部 海洋生态系统 2. Translation. 甚至河底都满是垃圾。
37、 这个方法不仅残酷还对环境有害。 鲨鱼处于海洋食物链的顶部。 许多人相信鱼翅对健康有好处。 II. Grammar Focus Pay attention to the sentences. 1) Were trying to save the earth. 2) The river used to be so clean. 3) The air is badly polluted. 4) No scientific studies have shown that shark fins are good for health. 5) We should help save the sharks
38、. 1. 现在进行时: Present Progressive 定义：表示说话时正在进行的动作，也表示目前或现阶段一直进行的动作。 结构: be (am/is/ are) + v.-ing 标志词：Look, Listen, now, right now e.g. Look! The boy is crying. 2. used to do与be used to doing used to do sth. 表示过去常常做某事, 而现在往往不做了, 后接动词原形。 be used to doing sth. 表示习惯于做某事。 e.g. I used to get up at six ocloc
39、k. Joe is used to drinking a cup of coffee every morning. 3. 被动语态：Passive voice 定义：表示主语是动作的承受者，即行为动作的对象的一种语态。 结构：be + 过去分词 e.g. A new school was built last year. Our classroom is cleaned every day. 4. 现在完成时: Present Perfect 定义：表示动作已经完成, 但对现在造成影响; 或者表示从过去某一时间开始一直延续到现在并还可能持续下去的动作。 结构: has/have + 过去分词
40、标志词：already, yet, ever, never, since, for e.g. I havent finished my homework yet. 5. 情态动词 1) 情态动词本身有一定的词义，表示说话人的情绪、态度或语气，但不能单独作谓语，只能与其他动词构成谓语。常见的有：can (could), may (might), must, need, shall (should), will (would)等。 2) 情态动词无人称和数的变化, 后接动词原形。否定式是在情态动词后面加not。个别情态动词有过去式形式, 可用来表达更加客气、委婉的语气。 e.g. Ken can
41、climb up the tress like a koala. Tracy could ride a bicycle when she was five years old. You mustnt play with fire. It is dangerous. III. Practice 1. Work on 4a. Fill in the blanks with the correct forms of the verbs in brackets. Joe: _ you ever _ (take) part in an environmental project ? Eric: Yes,
42、 I have. I _ (help) with a Clean-Up Day last year. It was _ (consider) the biggest clean-up project this city _ ever _ (have). Joe: How many people _ (take) part? Eric: I _ (think) more than 1,000 people _ (come) to help out. Joe: Thats fantastic! I guess everyone in this city is _ (try) to improve
43、the environment. Eric: Yes, we cant afford to _ (wait) any longer to take action! Learn some new words and expressions. 2. Work on 4b. Fill in the blanks with the appropriate modal verbs from the box. The words are: can, would, could, have to, should, must, may/might People _ think that big things _
44、 be done to save the earth. 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 reusable bags instead of plastic bags. I think its a great idea that you now _ pay for plastic bags in some stor
45、es. 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 become big things that _ improve the environment. Lets take action now! Learn some new words and expressions. 3. Work on 4c. Make a list of things that people can do to help the environment and discuss your list with your partner. use public transportation (n.交通运输); turn off the lights when you leave a room
