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1、情态动词全解析一、何谓“情态动词”？情态动词主要用来表示说话人的情感、态度等，是中学英语语法的重点，也是高考的热点，是单项填空必考的一个知识点。情态动词在近五年高考中主要考查四点：情态动词表示推测和可能性的用法；情态动词与虚拟语气；情态动词的表达“情感、态度、语气等”，情态动词表示 “必要性”等方面的用法。二、情态动词的特点1.没有人称和数的变化。2. 有些情态动词有过去式的变化:e.g. will would , can could , may might , dare dared三、情态动词的否定形式情态动词+ not +动词原形can not: cant , must not: must
2、nt , need not : neednt四、情态动词的用法及相互间的区别（注意：这是常考的考点）1. can , be able to be able to 表示经过努力后, 能够做到; be able to 有多种形式的变化。can 1). 表示体力或脑力方面的能力; 2). 表示允许、可能性。could 是can的过去式, 表示过去有能力及过去存在的可能性 ; 用于疑问句表示委婉地提出问题。1) The fire spread through the hotel very quickly but everyone _ get out. A. had to B. would C. cou
3、ld D. was able to 2) -Will you stay for lunch? -Sorry, _. My brother is coming to see me. A. I mustnt B. I cant C. I neednt D. I wont 2.may 表示询问或说明一件事可不可做; 表示某事有可能发生。might是may的过去式; 用在疑问中比may委婉、客气。1) -May I take this book out of the reading-room?-No, you mustnt. ( Yes, you may.)2) -Might I make a sug
4、gestion? -Yes, you may.3. must 1). 表示必须要做的事: 必须 2) 表示很有把握的推断: 一定, 准是。have (has)to : have (has)got to 必须, 不得不。过去式: had to3) -Must I get to the station before three oclock?-Yes, you must. ( No, you neednt. )4) Im afraid you will have to wait a while.5) She must be in the classroom now.6) Mary _ be in
5、Paris, I saw her in town only a few minutes ago. A. mustnt B. shouldnt C. cant D. may not4. shall 1) 在疑问句中, 用于第一、三人称表示说话人征求对方的意见或向对方请求。2) 用于二、三人称,表示说话人给对方的 命令、警告、允诺等概念。1) - Shall I place an order with you now? -No, you neednt. -Shall he turn down the radio a bit? -Yes, please.(No, please dont.)2) Yo
6、u shall have the English book as soon as I finish it.3) Everything that he owns shall be taken away from him.4) Your brother seldom comes to see you, _?A. does he B. doesnt he C. will he D. isnt he5) Its a fine day. Lets go fishing, _?A. wont we B. will we C. dont we D. shall we5. should 应该 ; 应当1) Y
7、ou should listen to the doctors advice.2) You should study the article carefully.6. will, would1) 在疑问句中用于第二人称,表示说话人向对方提出请求或询问。用would语气更加婉转。2) will 表示现在的习惯性动作或状态; would 表示过去的习惯性动作或状态。3) will 用于各种人称, 表示 意志、意愿、决心、允诺; would 表示过去时间的 意志、意愿、.。(1) Dont smoke in the meeting room, _ you? A. do youB. will you
8、C. can you D. could you-Will you come with me? -Yes, I will.(I am sorry , I cant.)(2) -Would you tell us something about yourself? -Yes, I will.(3) - Its my birthday tomorrow. Dont forget to come to my party.- _ .A. I dont B. I wont C. I cant D. I havent7. ought to 应该; 应当1) You oughtnt to smoke too
9、much.2) She _ for what she has done.A. ought to praise B. ought be praisedC. ought to have praised D. ought to be praised8. dare 1. dare to come 2. dare come1) He dare not tell the truth. 2) He doesnt dare to come out at night.3) I dont know whether he _ try.A. dare B. needs C. wants D. is allowed9.
10、 need 1). 作为情态动词:必须 2). 作为实义动词: 需要A.主语是人 need( to do something ; to be done by somebody) B. 主语是事物 need ( doing; to be done) 1) -Do they need to take any books with them?-No, they dont need to.2) -Need we buy any new equipment? -No, we neednt.3) This farm tool needs repairing. This farm tool needs to
11、 be repaired. 4) -Shall I tell John about it ? - No, you _ . Ive told him already.A. neednt B. wouldnt C. mustnt D. shouldnt5) Its a fine day. You _ take a raincoat with you. A. cant B. mustnt C. neednt D. may not五、情态动词的解题例析(1) 认真审题，结合所给出的语境，正确把握说话者的语气、情感、态度、观点等。(2) 认真思考所给选项中情态动词的基本特征和用法，并结合语境推敲答案。(
12、3) 要注意把握时间概念。情态动词无论是表达“推测和可能性”，还是表达“虚拟”这一概念，只要是对过去已经发生的事情进行描述，一律用“情态动词+have done”这一结构；对现在或将来的事情进行描述，用“情态动词+动词或系动词原形”。例如：（NMET2008山东，24）Thank you for all your hard work last week. I dont think we _ it without you. A. can manage B. could have managed C. could manage D. can have managed根据题干中所给出的时间last
13、week可知我们已经做完了工作，已经完成，故排除A、C两项，再结合could have done表示虚拟语气以及与前面的I dont think，故说话者想表达的意思是：离开了你，我们本不可能完成这项工作。故答案为B项。下面我们来看看常考的一些情态动词以下试题均来源于往年的高考试题，具有很强的针对性(1) must表示推测，意为“一定”，只能用于肯定句中。 must have done意为：一定做过某事或某事肯定发生了。 例如： She looks very happy. She _ have passed the exam.I guess so. Its not difficult afte
14、r all. A. should B. could C. must D. might【解析】句意为：她看上去很高兴，一定是通过了考试。【答案】C(2) should (not) / ought (not) to在中表示根据常规或常识推测，表示“某事应该或不应该发生”，语气比must或cant / couldnt稍弱。例如：Hows your tour around the North Lake? Is it beautiful?It _ be, but it is now heavily polluted.A. will B. would C. should D. must 【解析】should此处表示推测，意为“应该”。【答案】CThere _ be any difficulty about passing the road test since you have practiced a lot in the driving school. A. mustnt B. shant C. shouldnt D. neednt【解析】句意：既然你在驾校进行了大量训练，那么通过道路测
