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1、Unit 8Were trying to save the earth!,Section A 3Grammar Focus-4c,Revision,不同种类的污染2. 河底3. 把垃圾扔到河里4. 在中起作用,different kinds of pollution,the bottle of the river,throw rubbish into the river,play a part in,I. Check if you know these phrases.,5. 在中国南部6. 对有害7. 在顶部8. 海洋生态系统,in southern China,be harmful to,
2、at the top of,the oceans ecosystem,II. Translate the sentences.,1. 甚至是河底都满是垃圾。2. 这个方法不仅残酷还对环境有害。,Even the bottom of the river was full of rubbish.,This method is not only cruel, but also harmful to the environment.,3. 鲨鱼处于海洋食物链的顶部。4. 许多人相信鱼翅对健康有好处。,Sharks are at the top of the food chain in the ocea
3、ns ecosystem.,A lot of people believe that sharks fins are good for health.,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
4、 sharks.,Present progressive,used to,Passive voice,Present perfect,Grammar Focus,Modal verbs,现在进行时: Present Progressive,结构: be (am/is/are) + v.-ing标志词：Look, Listen, now, right nowe.g. Look! The boy is crying.,定义：表示说话时(瞬间)正在进行的动作, 也表示目前或现阶段正在进行的动作。,Exercise,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
5、 形。be used to doing sth. 表示习惯于做某事e.g. I used to get up at six oclock. Joe is used to drinking a cup of coffee every morning.,used to do与be used to doing,Translation.1. 她过去常常周末和朋友闲逛。 She used to hang out with friends on weekends.2. 他习惯于每天晚上睡得很晚。 He is used to staying up.,Exercise,被动语态：Passive voice,定
6、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.,Translate the sentences by using Passive voice.1. 刚才一些老年人参观了博物馆。2. 工人们使用不同种类的机器工作。,The museum was visited by some old people just now.,Different kinds of machines are used to work by t
7、he workers.,Exercise,结构: has/have + 过去分词标志词：already, yet, ever, never, since, fore.g. I havent finished my homework yet.,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。,现在完成时: Present Perfect,Complete the following sentences. I _ (be) in Beijing for two years.2. I _ never _ (hear) of that
8、 man before.3. Tom _ (work) there since two years ago.,have been,have,heard,has worked,Exercise,4. The twins _ (wash) the clothes for an hour.5. He _ (play) basketball since three years ago.6. How long _ Sally _ (sing) yet?,have washed,has played,has,sung,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
9、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。,情态动词,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 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 dan
10、gerous.,Translation.1. 我们不能在教室里吃东西。2. 首先你必须完成作业。3. 他现在不可能在家。4. 她一定知道这个问题的答案。,Exercise,We cant eat in the classroom.,You must finish your homework first.,He cant be at home now.,She must know the answer to this question.,4a,Fill in the blanks with the correct forms of the verbs in brackets.,Joe: _ yo
11、u ever _ (take) part in an environmental project ?Eric: Yes, I have. I _ (help) with a Clean-Up Day last year. It was _ (consider) the biggest clean-up project this city _ ever _ (have).,Have,taken,helped,considered,had,had,参加,Joe: How many people _ (take) part?Eric: I _ (think) more than 1,000 peop
12、le _ (come) to help out.Joe: Thats fantastic! I guess everyone in this city is _ (try) to improve the environment.Eric: Yes, we cant afford to _ (wait) any longer to take action!,took,think,came,trying,wait,v. 承担得起(后果); 买得起,4b,Fill in the blanks with the appropriatemodal verbs from the box.,People _
13、 think that big things_ be done to save the earth. Many forget that saving the earth begins with small things. For example, you _ save,may/might,must,can,can would couldhave to should mustmay/ might,electricity by turning off the lights when you leave a room. You _ also use reusable bags instead of
14、plastic bags. I think its a great idea that you now _ pay for plastic bags in some stores. And instead of driving to school or work, you _ ride your bike or walk. If its far, you _ take the bus. All these,could,have to,can/should,can/could,关掉,adj.可重复使用的,付费;付出代价,small things _ add up and become big t
15、hings that _ improve the environment. Lets take action now!,could,would/can,采取行动,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;use reusable bags instead of plas
16、tic bags;ride your bike or walk to school or work;stop using paper napkins(餐巾纸);recycle books and paper,Discussion,I think that everyone should use public transportation.,I disagree. Its difficult for parents with young children to use public transportation,1. We cant afford to wait any longer to ta
17、ke action! afford v. 承担得起; 提供, 给予 afford to do sth. (常与can, be able to连用) 买得起; 有足够的e.g. We cant afford to pay such a price. 我们付不起这个价钱。 Dancing affords us pleasure. 跳舞给我们带来快乐。,2. save electricity by turning off the lights when you leave a room. turn off 关掉 e.g. Please turn the television off before you go to bed. 睡觉前请关掉电视。,turn around 转身 turn up 调高(音量)turn down 调低; 拒绝turn into 变成; 进入 turn on 打开, 发动 turn off 关掉, 关闭turn out to be 结果是turn over 移交,拓展: turn相关短语,Finish the exercises in the workbook.,