初中英语情态动词详解.doc

情态动词◆ 情态动词的定义：表示说话人对某一动作或状态的态度◆ 情态动词的特点：1. 后接动词原形 2. 没有人称和数的变化3. 变否定句直接加not. 4. 变一般疑问句直接将情态动词提前◆ 常用的情态动词：can/could, may/might, will/would, shall/should, must, need, etc. (注意：need有两种用法) u 情态动词的用法：1. can 和could的用法 ⑴ 表示能力could可作为can的过去） Eg. She _____ speak English now. / She _______ speak English at the age of five.⑵ 表示可能性对现在可能发生事情的推测）Eg. Anybody ______ make mistake. / He _______ be at home. (否定推测)(3) 表示请求could比can更委婉）Eg. ______I use your room? / ________I use your room? (更委婉)2. may 和might的用法。

⑴ 表示请求might比may语气更委婉Eg. ______ I use your dictionary.⑵ 表示可能性Eg. He ______ be right.⑶ 表示祝愿Eg. _____ you success! / _____ all your dreams come true.3. will (won’t) 和shall (shan’t) 的用法：⑴ 表将来：will可用于各种人称，而shall 只能用于第一人称I/we.⑵ shall用在一般疑问句中表示提建议Eg. Jane _______ join in the long jump, while I ________ take part in the high jump. --- ________ we go for a picnic this weekend? --- Good idea! 4. must的用法⑴ 表示必须否定式mustn’t表示“禁止”Eg. You _______ return it to me. / You _________ smoke in the office.⑵ 表示肯定的推测（一般用于肯定句中）Eg. The light is still on, so he ______ be at home. （对现在肯定的推测） I saw him just now, so he _________be in London. (对现在否定的推测)◆ 注意：① 在回答包含must的问句时，若是肯定回答可用must;若为否定回答，用needn’t或don’t have to,表示“不必”。

Eg. Must I take my camera ? ---Yes,you _______.---No,you __________./ No,you __________________.② Must和have to的区别：两者都有“必须”之意但must表示说话人的主观意志，have to表示客观的需要Eg. You must stay at home tonight. / I have to stay at home tonight.5. need的用法① 作情态动词用表示“需要”拥有情态动词所有特点) Eg. She ________ clean the classroom. / She ________ clean the classroom.(否定)② 作实义动词用表示“需要”此时 need就像其他动词一样，有人称和数的变化，固定搭配：need to do sth.） Eg.She ___________ take part in the sports meet. She _______________ take part in the sports meet. (否定)u 半情态动词：have to (具有以下特征：)1. _____________________________2. _____________________________3. _____________________________ Eg. My mom ____________ cook for us every day. (我妈妈每天得为我们做饭) He ___________________ cook himself. (他不用自己做饭。

) 随堂练习一. 句型转化1. ---Must I finish my homework now?(作否定回答) ---No, ________ _________./ No, ________ ________ _______ _______.2. Kangkang need clean the classroom himself.(变否定句) Kangkang ________ ________ the classroom himself.3. Jack has to return this book this Friday. (变否定句) Jack _______ ________ ______ return this book this Friday.4. My friend will cook a big dinner the day after tomorrow.(划线提问) ________ ________ your friend ______ the day after tomorrow?5.She can play baseball now.(用three years ago改写) She _______ _______ baseball three years ago.二．用适当的情态动词填空。

1. I _________ go climbing with my father tomorrow afternoon. I’m not sure.2. You _________ (not) play with knives. It_________ hurt you..3. You ___________ finish your himework before you play computer games.4. We _________ say no to drugs.5. You _________(not) take your camera there. Mike _______ take his.6. I _________(not) do this work myself. _________ you help me?7. He __________ (not) be there now. I saw him crossing the street ten minutes ago.8. ________ you be happy forever.9. ________ we take more warm clothes with us?10. Listen! There is someone singing in the room. That ________ be Tina. She likes singing best.三．选择正确答案。

1. --- I hear you got a new phone. _______ I have a look? --- Yes, certainly.A. May B. Do C. Shall D. Must2. --- I can't stop playing computer games. --- For your eyes, my dear friend, I’m afraid you ________.A. may B. can C. must D. will3. ---Mum, must I stay there the whole day? ---No, you _______. You ______ come back after lunch, if you like.A. mustn’t; can B. needn’t; must C. mustn’t; should D. needn’t; may4. --- Is Maria knocking at the door? --- It ________ be her. She is in Australia now.A. may not B. needn’t C. mustn’t D. can’t5. --- May I play computer now? --- No, you _________.A. must not B. may not C. don't have to D. shouldn’t6. His mother is ill today. So he _______ to stay at home to look after her.A. may B. must C. have to D. has to 7.--- I ______ take part in the long jump this weekend. --- _______ you success!A. need; Will B. will; May C. may; Must D. need; Should8. You had better ________ there on foot. It’s very far.A. go B. not go C. to go D. not to go。