情态动词的用法常见的情态动词：1). Must、can、could、may、might2). Shall、should、ought to、dare3). Will、would4). Need1. must1) 必须; 表示必要或很重要2）一定; 表示对现在的肯定推测3）应该; 表示提议E.g When you enter the building, you must show the guard your pass.(强调必要性)Y ou must be tired after your long journey. （肯定推测）Y ou must read this story because it’s funny. (建议或提议)2. can/ could1) 有时候会，时而可能; 表示常有的行为或情形2) 不可能；用于否定句，表推测3) 竟然能，难道会，怎么能；表疑惑或惊讶4) 能，会；表有能力，能够5) 可以；表允许或请求或建议6）必须；表示对方必须做，尤其指说话人在生气的时候E.g It can be windy on the top of the montain, especially in winter.That can’t be Bohu, he is in the room of Qiuxiang. （推测）How can you be so rude! （惊讶）I can figure out this qustion easily. (能力)Y ou can borrow some books from the library. (允许)Can I use your pen? (请求)W e can go swimming, if you like. (建议)If you won’t keep quiet, you can get out here.3. may/ might1) 也许，可能，但不确定2) 可以：征求意见或允许3) 可以：礼貌地评价或提问等E.g He may be right. (但也有可能错)May I use your pen. (征求意见)May I ask how you finished your work on time.( 提问)4. shall1) 用于一、三人称疑问句，表征求对方意见2) 用于二、三人称陈述句，表决心，允诺，命令，警告等E.g What shall we do this weekend? (征求意见)Don’t worry, you shall get the answer this afternoon. (允诺)When she comes in, nobady shall says a word. (命令)5. should1) 应该；用于纠正别人/ 劝告2) 该；用于征求建议3) 应该会/ 可以；表示预期4) 本应；表示与预期相反（虚）5) 竟然；用于许多表示感情的adj 后的that-从句中，表示惊讶、失望、愤怒、惋惜、欢心等6) 用于why、how、who、what should sb/sth do…句型，表示拒绝、惊讶、恼怒E.g Y ou should keep your promise. （纠正）Should I call him and apologize. （征求意见）They should arrive at noon. （预期）It should be snowing now, according to the weather forecasting. (虚)I’m surpised that he should eat so little every day. (惊讶)Why should I help him? He’s never done anything fot me.（不高兴）6. ought to1) 和should 用法基本一致（should 用法中的1）、2）、3)）2) 应该；表示义务或责任E.g I know I ought to bring up my kids well. (责任)7. dare1) 敢；做情态动词时，多用于否定句、疑问句、条件句中2) 敢；做实义动词时，在肯定句中必须和不定式to连用（dare to do）;在否定句或疑问句中可省略to。

E.g I dare not mention their names.Dare we tell her the truth?If he dare come here, I will go.Only he dares to tell the truth.He dares (to) say anthing.8. will/ would1) 愿，要，会；表示愿意2) 是否愿意…，…好吗；烦劳别人时的用语3) 总是；表示习惯4) 叙述在某种情况下是有可能的事情或真事5) 叙述一般真理6) 可能，该是；含有肯定的意思E.g I will help you if you need me. (愿意)Will you help me? (麻烦别人时用语)She will listen to music for hours when alone in her room. (习惯)The shop will not open before 9 o’clock.Heated, water will change to vapor. (真理)This will be the house we’re looking for.9. need 需要E.g Y ou needn’t complete the essay tonight.----Need you go now? 你现在得走？----Y es, I must. No, I needn’t. 是，我现在得走；不，我不必现在走----Must I go now?----No, you needn’t 注意：这个时候不用mustn’t (表禁止)特殊用法1)Can’t but do sth 不得不/ 只好做sthE.g I can’t but choose this book2) may/ might well 完全能，很可能E.g Her appearance has changed so much that you may well not recognize her.3) may/ might as well 最好，倒不如E.g Y ou may as well do it at once.4) can’t / never 等否定意义的词和enough/ too 连用，再…也不为过E.g Y ou can’t be careful enough in the street.5) may 可用于祈使句，表祝愿E.g May we never forget each other.习题1.I can’t leave. She told me that I_______stay here until she comes back.A. canB. mustC. willD. may2. One of the few things you_______say about English people with certainty is that they talk a lot about the weather.A. needB. mustC. shouldD. can3. What do you mean, there are only ten tickets? There＿＿＿be twelve.A. shouldB. wouldC. willD. shall4. ----Hi, Xiaqiang. Any idea where Qiuxiang is ?----She______in the classroom. I saw her there just now.5. The traffic is heavy these days. I ______arrive a bit late, so could you save mea place.A. canB. mustC. needD. might6. ----What sort of house do you want to have? Something big?----W ell, it_______be big-----that’s not important.7. That he_____speak to you like that is quite astonishing.A. couldB. mustC. wouldD. should8. ----How’s your tour around the North Lake? Is it beautiful?----It______be, but it is now heavily polluted.A. willB. wouldC. shouldD. must9. The boss has given everyone a special holiday, so we____go to work tomorrow.A. can’tB. mustn’tC. needn’tD. shouldn’t10. ----Turn off the TV, Jack. ______your homework now?----Mum, just ten more minutes, please.A. Should you be doingB. Shouldn’t you be doingC. Couldn’t you be doingD. Will you be doing。