高中英语人教版必修三学生版学案：Unit2Healthyeating情态动词语法.docVIP

第  PAGE 4 页 共  NUMPAGES 4 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.[来源:Zxxk.Com] 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[来源:学科网ZXXK][来源:学科网ZXXK] dare not do否,疑don’t dare to do 　　　　 don’t dare do[来源:学+科+网]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 t