初中英语语法专题辅导第九讲情态动词.ppt

两者都表示必须 must 侧重于说话者的主观看法，认为有必要或有义务去做某事； have to 则重于表示外界客观需要，含有不得不或被迫之意 I?didnt?take?the?raincoat?with?me?yesterday. I____ wait?for?my?father.  A. have?to????B. has?to????C. had?to????D. must 2. Jack’s ill, so they ______ change their plans. 　　A. must B. should C. have to D. ought to 用法一 用法二 用法三 作为实义动词，后加to do.用助动词提问或否定 四、need的用法 作为情态动词，后加do.用need提问或回答 need后加doing表被动意义 1. I need type this letter again. 我需要重新录入将这封信. 2. There is enough time. You needn’t hurry. 有的是时间，你不必着急。 作情态动词 主讲教师：王克平 情态动词 If you want to cross a street, you must wait for the green light. You mustn’t cross in front of the traffic. If the light is yellow, you should wait. If you are not careful, a car may hit you. If you are in the UK, you have to drive on the left. and find out 情态动词,顾名思义是用来表达感情和态度的动词。 表明说话人的立场和口气,以及说话想达到的目的 常用的情态动词有： can (could), may (might), must, have to, need, ought to, shall , should Some of us can use the computer now, but we couldn’t ten years ago. Can/Could I borrow these books? The story can not be true. 1）能，会：表示能力，相当于be able to (be able to 适用于任何时态)。 2）可以，表示许可，(may较正式，could较婉转） 3）可能，表示否定推测，can’t be 不可能 （2012年济南） ----- Lisa, _____ you speak French? ----- Yes, but only a little. A. need B. must C. may D. can 2013济南 ---_____I help you, sir? ---Yes, I want a T-shirt. 　A Can B Should C Must D Would （2010年北京） ------＿＿you turn down your radio, please? ------Yes, I can. A. May B. Need C. Must D. Can （2009年济南） -----Who’s that girl swimming in the pool? Is it Lucy? -----It ＿＿be Lucy. She is sleeping in her bedroom now. A. may B. can’t C. must D. should 1.表推测 2.表请求、允许 1. ---May I watch TV after supper? --- Yes, you may. --- No, You may not / can’t. / You’d better not. No, you mustn’t. 2. If you are not careful, a car may hit you. 可以，表示许可，相当于can. (注意问句中的回答） 2) 可能，或许，表示推测 may be 可能 1. ---May I watch TV after supper? --- Yes, you may. --- No, You