_Unit 2 Healthy eating 情态动词教学设计- 高中英语人教新课标必修三.doc

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1、人教版高中英语必修三 Unit 2 Healthy eatingGrammar情态动词（Modal verbs）一、教学设计【教学目的】1. Students will know the usage of the modal verbs.2. Students will learn to use the modal verbs.【教学流程】Step 1 ought to 与ought not to的用法1. ought to多表示责任、义务，语气强烈，与should意义相近，但should常表示劝告、建议、 命令。否定形式为ought not to。 eg. By now his restau

2、rant ought to be full of people. You ought not to go.2. should和ought to的不同： 1) should, ought to表示“应该”，ought to表示义务或责任，比should语气重。 eg. I should help her because she is in trouble. You ought to take care of the baby. 2) 表示劝告、建议和命令。should, ought to可通用，但在疑问句中常用should。 eg. You should / ought to go to cla

3、ss right away. Should I open the window?Step 2 have to 和dont have to的用法1. must, have to比较： 1) 表示必须、必要。 eg. You must come in time.在回答引出的问句时，如果是否定的，不能用mustnt（禁止，不准），而用neednt, dont have to（不必）.eg. Must we hand in our exercise books today? Yes, you must. No, you dont have to / you neednt. 2) must是说话人的主观

4、看法， 而have to则强调客观需要。Must只有一般现在时， have to 有更多的时态形式。 eg. The play isnt interesting. I really must go now. I had to work when I was your age.2. must表示推测、可能性（只用于肯定的陈述句） eg. Youre Toms good friend, so you must know what he likes best. Your mother must be waiting for you now.Step 3 mustnt的用法虽然must是表示“必须”的

5、意思,但是用于否定式时,mustnt却表示“不要、不能、禁止”的意思,而不是表示“不必”.这是中考的一个考点.eg. You mustnt leave here.你不能离开这儿. You mustnt go swimming today.今天禁止你去游泳. You mustnt drive so fast.你不能开这么快.Step 4 neednt的用法neednt 不需要;不必;强调客观条件。常做must问句的回答： eg. Must I finish my homework today? No, you needn't You needn't be oversensitiv

6、e. It has nothing to do with me. 你不必多心，这事与我无关。 You needn't truckle to your aunt like that. you are a grown woman now. 你没有必要那样胆小顺从你的伯母，你现在是一个成年妇女了。 Children below 120 cm neednt pay fare. 120公分以下的小孩不必买票。 Practice：Read these dialogues and complete them with the proper modal verbs.1. JOHN: We should

7、 get to the theater by seven oclock. What time do you think we should leave? SARAH: I think we have to leave home at six oclock, or we wont arrive there in time.2. GEORGE: I dont feel well. The doctor told me that I have to give up smoking. He also gave me the medicine. Do you think itll do me any g

8、ood? AMY: If you follow the doctors advice, it will help you.3. SALESMAN: This car is one of the safest on the market. Even so, you mustnt be silly and drive without wearing a seat belt. CUSTOMER: I will never do that!4. RON: Lets go to Carlas party tonight! TOM: Well, I dont mind going as long as I

9、 dont have to dress up. RON: Thats OK. You dont even need to wear a tie if you dont want to.5. SUSAN: Do you know where Alan is? I cant find him anywhere. ROBIN: Well, he couldnt have gone far. His bag is still here.Step 5 SummaryThe structure of the lesson is as follows:情态动词(Modal verbs)ought to/ought not tohave to/dont have tomustntneedntStep 6 Homework4