教学课题 人教版七年级英语下册语法点讲解同步教案 1、了解情态动词，掌握常见情态动词 2、区分各情态动词 3、灵活运用情态动词 教学目标 教学重点1、情态动词的区分 与难点 2、情态动词的使用 教学过程 情态动词 知识梳理 1）情态动词表示说话人对所说动作的观点，如需要、可能、意愿、怀疑等； 2）情态动词没有人称和数的变化，有的情态动词没有时态的变化，如must； 3）情态动词必须和动词原形连用； 4）常见的情态动词有：can,may,must,have to,should,would等； 5）情态动词的否定一般是在其后面加not，而一般疑问句则是将其提到句首。 例题精讲 1.can: ①表示能力：We can speak English. 例：I______play badminton,but I_______play volleyball. ②表示许可：You can play basketball on weekends. 例：You_____eat ice-cream after dinner. ③表示请求：Can you help me with my English? 例：______you close the door? 【could也可以表示请求，但语气比can更委婉：Could you tell him to call me back?】 2.may: ①表示许可，意思是“可以”：May I help you? 例：Class is over,You_______go now. 【may和can都可以表示许可，但may的用法更正式，语气更委婉】 ②表示可能性，意思是“也许，可能”：I may be late,so don’t wait for me. 例：That_____be true. 3.must: 表示“必须”：Don’t arrive late for class.We must be on time. 例：You______read a book before you watch TV. 4.have to表示“必须”、“不得不”，有时可以和must互换： We have to be quiet in the library.=We must be quiet in the library. We have to follow the rules.=We must follow the rules. 【have to和must的区别】： ①must通常表示说话人的主观看法，语气比较强烈，have to往往强调客观需要： I must go now. It’s a little late and I have to go now. ②否定含义大不相同。mustn’t 表示“不准、禁止”；而 don’t have to表示“不必”： You mustn’t talk to your mother like that. You don’t have to come if you don’t want to. ③must一般只表示现在，没有人称和数的变化，而have to则可以用于不同的时态，有人称和数的变化： I/We/You/They must do something about it. I have to finish my work today. She has to finish her work today. They had to get to the station before 5:00. 巩固训练 1. I’m sorry. I ___ go now. My father told me on the phone that my mother was ill. A. can B. may C. have to D. think 2. ---___ your friend play the guitar? ---Yes, he can, but he can’t play it well. A. Must B. Can C. Should D. Need 3. ---Is Mr. Brown driving here? ---I’m not sure. He ____ come by train. A. may B. shall C. need D. must 4. I’m sure this book ___ Li Lei’s, because there is his name on it. A. can’t be B. may be C. might be D. must be
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