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1、Unit 2 Topic 2 I must ask him to give up smoking.Section D一、学习目标 Aims and demands1. 掌握本部分重点词组和句型。2. 复习整个单元，并会用情态动词围绕健康的生活习惯展开话题。二、学法指导 How to study1. 认真阅读Unit2 Topic2 Section D，并对语言点、难点做出标记；2. 记本部分单词、学案所列出的词组和句型；3. 学习学案，并完成学案上的练习题；三、 自主预习 Preparation.英汉互译下列单词并标上词性。1. risk_( ) _( ) 2.事实，真相_( )3.unhea
2、lthy_( ) 4.化学品_( ) 5.香烟_ ( )6.身体_( ) 7.disease_( ) 8.smoker_( )9.二手的，旧的_( ) 10.possible_( ). 在课本中找出下列短语划在书上并翻译1.洗澡 _ 2. 事实上_3. 四千多种化学物质_ 4. 引起癌症及其他疾病_5.不仅而且_ 6.戒烟_7.尽可能快地_ 8.一周少于三次_ . 翻译并熟记下列句子.1. 你千万不要到处乱扔垃圾。_2他认为吸烟能帮他放松。_3我必须要求他戒烟。_4熬夜对你的健康是有害的。_5我们应该把垃圾扔进垃圾箱内。_四、知识链接 Hot link1must 的用法我们平时说话总会用到“必
3、须；必要；应该；一定”等字眼，其实，在英语中这些意思绝大多数由must一词来担当。说到这里，让我们一起对must来个彻底的了解吧。(一)、must的个性：must拥有情态动词家族的共性：无人称和数的变化，也无时态变化。作谓语时一律用“must +动词原形”结构。(二)、must的本领：（1）must表示说话人的主观看法或愿望，认为“必须”做某事。例如：I _ _ hard. 我必须努力学习。（2）表示要求某人必须做某事时，主语用其它人称。例如：You must wait in line. 你必须排队等候。（3）在肯定句中，must可以表推测，语气要比may肯定得多。must表示对某事把握很大的
4、推测，只能用于肯定句，意为“想必；准是；很可能”； must be表示“必定无误”。当表示对现在的情况进行推测时，must后也接动词原形或动词的现在分词。当情态动词may与be连用，表示推测时，其肯定程度比must要小得多。在否定句型表示推测的含义时不用mustnt而用 cant。例如：She _ _our new Chinese teacher.她一定是我们的新的语文老师。The door is closed. He cant be at home. 门关着，他一定不在家。(三)、must的变脸：（1）must的否定式是在must后面加上not，常缩写成mustnt，意思是“决不可；千万不能
5、； 务必不要；禁止”。在对May I .?作否定回答时用No， you mustnt / cant。例如： You _ tell her this news. 你绝不能（千万不要）告诉她这消息。You _ _smoke her.e你绝不能在这儿抽烟。（2）must的疑问式是将must提在主语前。must用在问句中作“必须”解，这时要注意肯定与否定回答时的用语。其肯定简略答语是Yes，主语+ must。若是否定回答，则是No，主语+neednt或dont have to。例如：Must I finish my homework today? 今天我必须完成我的作业吗？No，you _ / Yes
6、， you_. 不必。/ 对，你必须完成。五、目标检测 Practice. 单项选择。（10分）( )1. Watching TV too much _ bad for your eyes. Ill go to bed right away.A. is B. are C. was D. be( )2. Im fat. What should I do? Youd better eat _ meat and _ fruits.A. less; more B. less; less C. more; lessD. more; more( )3. I am afraid we will miss t
7、he early bus. Dont worry. We have _ time to do it.A. few B. enough C. little D. many( )4. Humans cant live _ air. I agree with you.A. without B. with C. in D. for( )5. Scientists tell us smoking can cause cancer. _A. OK. B. Thats a good idea. C. Its really terrible. D. It doesnt matter.( )6. You had
8、 better ask your brother _ playing computer games. Its bad for him.A. to give up B. not to give up C. to give it up D. not give it up( )7. Sugar tastes sweet. But, _, its bad to eat too much.A. such as B. for example C. in fact D. though.根据句意及首字母提示补全单词。1. We should help the sick girl as p_ as we can
9、.2. The chemicals on the vegetables are bad for our b_.3. We shouldnt eat too much ice c_.4. Fruit is good for our health. We like to eat w_ in summer.5. Many d_ are caused by germs(细菌).用括号内所给单词的适当形式填空。6. I like to eat _ (potato). 7. His _ (ill) isnt serious.8. My sister likes to eat _ (tomato).9. _ (sandwich) are from foreign countries(来自国外).10. I am _ (surprise) at the news.六、反思与总结 Summary5. What should people do to keep away from SARS?_六、 总结与反思