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1、Unit 13 Were trying to save the earthSection A 3 (Grammar Focus-4c)I. Revision1. 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. Translate these sentences into English. 甚至是河底都满是垃圾。 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 FocusPay attention to the sent
2、ences.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.1. 现在进行时: Present Progressive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一直进行的动作。结构: be (am/is/ are) + v.-in
3、g标志词：Look, Listen, now, right nowe.g. Look! The boy is crying.2. used to do与be used to doingused 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 oclock. 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
4、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 + 过去分词标志词：already, yet, ever, never, since, fore.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
5、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 climb up the tress like a koala. Tracy could ride a bicycle when she was five years old. You mustnt play with
6、fire. It is dangerous.III. Practice1. 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, I have. I _ (help) with a Clean-Up Day last year. It was _ (consider) the biggest clean-up project this city _ e
7、ver _ (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 the environment.Eric: Yes, we cant afford to _ (wait) any longer to take action! Learn some new words and expressio
8、ns.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 _ be done to save the earth. Many forget that saving the earth begins with small things. For example, you _ save electr
9、icity 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 stores. And instead of driving to school or work, you _ ride your bike or walk. If its far, you _ take the bus. All these
10、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 t
11、he lights when you leave a room;use reusable bags instead of plastic bags;ride your bike or walk to school or work;stop using paper napkins;recycle books and paper4. Discussion. A: I think that everyone should use public transportation.B: I disagree. Its difficult for parents with young children to
12、use public transportationIV. Language points1. We cant afford to wait any longer to take action! afford v. 承担得起；提供, 给予 afford to do sth. (常与can, be ble 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. turning off 关掉 e.g. Please turn the television off before you go to bed. 睡觉前请关掉电视。拓展：turn相关短语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V. HomeworkFinish the exercises in the workbook.
