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情态助动词是一种本身有一定的词义,表示说话人的情绪、态度或语气的动词,但不能单独作谓语,只能和其他动词原形构成谓语。情态助动词无人称和数的变化,情态助动词后面跟的动词需用原形,否定式构成是在情态助动词后面加"not"。 一.9个常考情态助动词用法 1-2. Can/could A.表示能力(Ability): Can表示现在或将来;could表示过去能力 I can swim like a fish I can translate the article without a dictionary. 考点:could 表过去能力时,在肯定句中,could 泛指过去的一般能力,如指具体的能力用be able to, When I was younger I could swim like a fish. I was able to translate the article without a dictionary. B.表示请求ask for permission和允许( give permission ) : could的语气更委婉;但回答时通常用can ,不用could -Can/could I smoke here? -Yes, you can smoke here. /No, you can’t smoke here. C.表示可能性( possibility): could可能性小, can常用于否定句、疑问句中 Can/could the news be true? It could be true. What can he possibly mean? The moon cannot always be at the full. Lighting can be dangerous. 3-4. May、 might A.表示请求ask for permission和允许( give permission ): might的语气更委婉;但回答时通常用may ,不用might May/ Might I smoke in the room? 肯定回答:Yesyou may. (Yes, please. Certainly. Yes, of course. Sure. Go ahead, please.) 否定回答:No, you may not/mustn't(具有强烈禁止的意思) (No, you can't. No, I am afraid not. Please don't. You'd better not. /I'm sorry it's not allowed.) B.表示可能性( possibility): It may/might rain. (可能性may 70%; might 40%) 【注意】用may表示推测一般不用于疑问句,在疑问句中通常用can来代替: —Can it be true这可能是真的吗? —It may be, or may not be. 可能是,也可能不是。 C.表示祝愿( wish) May yousucceed.祝你成功。 2021 18.PersonA: Where is Tim? Person B: He might be next door. What is the function of the modal auxiliary verb "might" in the reply? A. To express relief. B. To dramatize a fact. C. To indicate possibility. D. To ask for permission. 13.Hereare sixty-five stories. Among them, __ you find at least a few you'll enjoy and care to remember. will B. should C. can D. may 5-6 Will、 would A.will和would可用于第二人称疑问句,表示请求和建议等。would比will委婉客气。 ---Will/would you please open the door for me? --- Yes /Certainly, I will. ---No/Sorry, I won’t. B.表示意愿(Willingness )、意图(Intention )、决心(determination )坚持(insistence) I will lend you the book if you need it. In those days he would risk anything for his comrades. I will write to her tomorrow. He would see her the next day, so he didn’t write to her. I will not go back on my word. She would marry him in spite of my warning that it was unwise. C.will和would可表示推论或猜测,可能性must>will>would a.特定事件(assumption of a particular situation) It will / would be from John, I suppose. He has worked very hard today. He will be sleeping now. b.习惯事态 (habit) He will often read all night. Before his retirement, he would catch the early bus every morning. c.will表示客观现象 (natural tendency) If you pour oil on water, it will float. 7.Shall A.古代英语中,shall用于第一人称,表达说话人的意图,即打算做… I shall leave here this night. (现代英语中被will替代) B.现代英语中,shall 用于第一称,通常在疑问句中shall I/we …来征求听话人的意图 Shall we have dinner? C.现代英语中,shall用于第二、三人称表示说话人的意图、意愿、决心 You shall get a promotion.( I will give..) You shall stay with us as long as you like.(I am willing to let… They shall do what I tell them to do. (I am determined…) 8.should A .表示建议劝告=ought to,可译为“应该 ",强调一种义务(obligation)主观性强 We should learn from the model workers. B.表可能推测,根据某种情况做出的判断,强调必然性(necessity) She should be here in a minute. You should be happy, for this is your wedding day. C.表示说话人的感情色彩,如惋惜、疑问、婉转责备等,常用在虚拟语气句型中 It is a pity that he should leave so soon. How should I know? I should say that he is just the right man for the job. Aren’t you tired? I should have thought you had done enough for today. 16."It'sa shame that the city official should have gone back on his word." The modal auxiliary SHOULD expresses obligation B. disappointment C. future in the past D. tentativeness 9.must A .表示必须=have to,督促命令 ,主观性强 You really must stop smoking.(现在) You had to stop smoking. (过去) You will have to stop smoking. (将来) 对于must提问,肯定用must,否定用needn’t/ don’t have to表不必;注mustn’t表禁止 --- Must they go with you? positive reply: Yes, they must. negative reply: No, they needn’t / don’t have to. B.表示推测,口气肯定,用于肯定陈述句中。 a.表示客观现象 (natural tendency) Careless reading must give poor results. War must be followed by hunger. b.特定事件(a particular situation You must be hungry after your long walk. Sam must be enjoying himself in Tokyo now. Must have done表达对过去的肯定推测 You must have left your handbag in the theatre. 二.情态动词可以表示推测,按照肯定的强度从强到弱排列是: must>will>would>ought to>should>can>could>may>might (can用在否定疑问中) 2016 12.Among the four sentences below, Sentence __ expresses the highest degree of possibility. A. It may take a long time to find a solution to the problem. B. It might take along time to find a solution to the problem. C. It could take a long time to find a solution to the problem. D. It should take a long time to find a solution to the problem. 三.情态动词+have done 1.Must/could/may/might have done 表达对过去的推测,用于陈述句 You must have left your handbag in the theatre. You could have left your handbag in the theatre. You may have left your handbag in the theatre. You might have left your handbag in the theatre. 2.can’t have done表达对过去推测,语气强,用于否定句 You can’t have left your handbag in the theatre. 3.Could/might have done表达虚拟语气惋惜遗憾(regret)“本可以做到,却没做” I could have passed the examination. You might have finished the work last week. 4.Should/ought to have done “本应该做...”shouldn’t/oughtn’t have done“本不该做…” You should/ought to have asked my permission first. She shouldn’t/oughtn’t have said such words to her husband. 5.need not have done something“不必做某事” You needn’t have spent all that money. I needn’t have worried. 强化练习 答案:1-5 DCBCA 6-10 DBDDC 11-15 ACBAA 微信扫描下方二维码,关注“英语考试与竞赛”公众号 回复“专四”,即可获得历年真题备考资料 本文信息搜集整理自互联网,信息版权及活动解释权归主办单位所有,我爱竞赛网仅作媒体支持。 请仔细看正文,正文里有报名办法,或者报名官网。
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