1、Period 3 SectionA(Grammar Focus-4c)教学设计 【教学目标】 1学习并掌握新词汇：reusable，afford，transportation 2学习并会用以下常用表达：try to do sth.，used to do sth.，is/are doing，be considered，take part in， play a part in doing sth.，help with，help out，turn off，instead of，pay for，add up，afford to dosth.，notany longer，take action，Its
2、difficult for sb.to do sth. 【学习重点】 掌握背诵 Grammar Focus 中的句子。 【学习难点】 正确使用本课语法要点。 【教学过程】 Step 1. 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. 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。 Step 2. Grammar
3、 Focus Pay attention t o 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 t he 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
4、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 oclock. Joe is used to drinking a cup of coffee every mo
5、rning.来源:学+科+网 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. Anew school was built last ye ar.来源:学#科#网 Z#X#X#K 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, n e
6、ver, since, for来源:Zxxk.Com e.g. I havent finished my homework yet. 5. 情态动词来源:学&科&网 Z&X&X&K 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
7、 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 dangerous. Step 3. Practice 1. Work on 4a. Fill in the blanks with the correct forms of the verbs in brackets. 2. Work on 4b. Fill in the blanks with the appropriate modal v
8、erbs from the box.cc 来 c 源:学*科*网 Z*X*X*K 3. Work on 4c.Make a list of things that people can do to help the environment and discuss your list with your partn er. 4. Discussion. A: I think that everyone should use public transportation. B: Idisagree. Its difficult for parents with young children to use public transportation Step 4 Exercise: Step 5. Homework Write an article to show in what way we students can protect the environment.
