高中英语人教版必修三学案：Unit2Healthyeating情态动词语法(教师版).doc

第  PAGE 6 页 共  NUMPAGES 6 页 教学内容 Learning aims: 1 知识与能力：To master some sentence patterns 2 过程与方法：To msater the usage of Grammar情态动词 3 情感态度与价值观：Try to pay your attention to the class! Learning key points: To master some sentence patterns Learning difficult points: To master the usage of Grammar情态动词 【学案使用说明】在提前预习的前提下完成学习指导即时感悟【回顾复习】 Check the home work (have a dictation of the language points) 【自主 合作 探究】 1. have to have to 表示客观需要去做的事情，意为“必须，不得不。” e.g. I have to get the station early to catch the first train. We missed the bus so we had to walk home. have to 有多种时态。常见的有: 一般将来时 We will have to gather at the school gate at 7 tomorrow. 一般现在时 I have to take more money with me because my wife has so much to buy. 一般过去时 Finally, we had to give up our idea to hold a picnic outside as it rained for a whole afternoon. 2.dare need Need I do …? Yes, you must. No, you needn’t. ?情态动词实义动词dare否，疑，条 dare not do否,疑don’t dare to do 　　　　 don’t dare do不用于肯定句肯：dare to do need否，疑 needn’t do (don’t) need sth (don’t) need to do 肯：must, have to, ought to, should?注意对need问句的回答: --Need I finish the work today? --Yes, ________________. No, ________________. No, ________________. needn’t 对其它情态动词的回答: --Shall I tell John about it? --No, you _______ --Must we do it now? --No, you __________. Could I borrow your dictionary?(委婉) Yes，you can/may. Sure. Go ahead. Please yourself. May I take this seat?(第一人称疑问句) Yes, you may. No, you mustn’t. 3. must +have done 表示对过去已经发生的行为进行推测，意为“想必/准是/一定作了某事”。 It must have rained last night, for the road was very muddy. 昨晚 一定是下雨了， 因为地上很泥泞。 We must have learned 2,000 words by the end of last term. 到上学期为止我们一定学了有两千个单词 。 4. can/could+have done表示对过去的行为的怀疑和不肯定，通常用在否定句和疑问句中。 Can they have won the basketball match? 他们可能赢了篮球赛吗？