2023年情态动词的基本用法.docx
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1、2023年情态动词的基本用法 第一篇:情态动词的基本用法 情态动词的基本用法 情态动词的特点 1.没有人称和数的转变。 2.有些情态动词有过去式的转变: will would , can could , may might , dare dared can(could) 1.表示实力。 Two eyes can see more than one.2.表示允许。 Can I have a look at your new pen? Can(Could)you lend me a hand? 3.表惊异、怀疑、不信任等看法。主要用于否认句、疑问句或感叹句中。 Where can(could)th
2、ey have gone to? He cant(couldnt)be over sixty.How can you be so careless? 4.表示揣测(确定句把握较小;否认句几乎为100%把握) The temperature can fall to 10.You cant be serious.may(might) 1表允许,might是may的过去式;用在疑问中比may委婉、客气。 You may take whatever you like.He told me that I might smoke in the room.2.表可能事实上。语气不愿定。 He may be
3、at home.他可能在家。 She may not know about it.I am afraid they might not agree with him.They might be having a meeting, but Im not sure.must 1.表必需主观意志 We must do everything we can to help him.You mustnt talk to her like that.-Must we hand in our exercise books now? -No, you neednt./ No, you dont have to.
4、2.表示很有把握的推断,意为“想必、准是、确定等,只用于确定句。have(has)to: have(has)got to 必需, 不得不。过去式为had to。 He must be ill.He looks so pale.She must have a lot of money, for she drives a BMW.shall 1.表征询看法,用于第一、第三人称疑问句。 Shall I get you some tea? Shall the boy wait outside? Its a fine day.Lets go fishing, shall we? 2.表说话人的意愿,有“
5、叮嘱、承诺、警告、决心等意思,用于其次、第三人称陈述句。 You shall do as I say.叮嘱 You shall have the English book as soon as I finish it.承诺 He shall be sorry for it one day, I tell you.警告 Everything that he owns shall be taken away from him.决心 will 1.表意愿,用于各种人称陈述句。 I will do anything for you.If you will read the book, Ill lend
6、 it to you.2.表请求,用于疑问句。 Dont smoke in the meeting room, will you? Wont you drink some more coffee? 3.表示某种倾向或习惯性动作。 Fish will die out of water.The door wont open.would 1.表意愿。 They would not let him in because he was poorly dressed.2.表委婉地提出请求、建议或看法。 Would you like another glass of beer? 3.表过去反复发生的动作或过
7、去的一种倾向。 Every time she was in trouble, she would go to him for help.should 1.表义务。意为“应当,用于各种人称。 You should listen to the doctors advice.你应当听从医生建议的。 You should study the article carefully.你应当细致读那篇文章。 2.表推想,意为“想必确定、照说应当、估计等。 The film should be very good as it is starring first-class actors.那部电影想必很棒,都是一
8、流的演员。 They should be home by now.如今他们应当已经到家了 ought to 1.意为“应当,口气比should稍重。 Ought you to smoke so much? 你应当抽这样多烟吗? You ought to write to the mayor.您应当给市长写信。 2.表推想,暗含很大的可能。 She ought to know his telephone number.她应当知道他的电话号码。 used to 过去常常, 如今不复发生或存在。 The Greeks used to worship several gods.过去,希腊人崇奉好几种神
9、。 He used to smoke.他过去抽烟如今不抽了。 情态动词的推想用法 确定句中: must(确定),may(可能),might/could(或许,或许)其语气确实定程度依次递减。其中,might 和could并非过去时态,只是语气较为委婉或可能性较小 对当前行为、状况或状态的推想: must /may /might /could + do/be He must/may/might/could be in the reading room.他确定/可能/或许在阅览室里。 I must look funny in this hat.我戴这顶帽子看起来确定很滑稽。 对此时此刻正在进行的动
10、作的推想: must /may/ might/ could + be doing 想必/可能正在 He must /may/ might/ could be watching TV at this time.他此时确定/可能/或许在看电视。 They must be waiting for us.他们确定在等着我们。 对过去发生的事情的推想: must /may /might /could + have +过去分词 想必/可能已经 They must have arrived by now.如今他们确定已到了。 You look very tired.You must have stayed
11、up last night.看上去你很疲乏,你昨晚确定熬夜了。 You may have read about it in the papers.你可能在报上已读到这件事了。 过去的一段时间内始终在进行的动作: must/may /might/ could + have + been +doing 想必/可能始终在 They are sweating all over.They must have been working in the fields.他们浑身是汗,准是在地里劳动来着。 He may have been waiting for us for an hour.他可能等我们一小时了
12、。 2否认句中: can/could not 不行能,想必不会 may/might not 可能不 对当前行为、状况或状态的推想: can/could not+动词原形 不行能,想必不会 may/might not +动词原形 可能不 He may not be busy now.或许他如今不忙。 He can not be busy now.他如今确定不忙。 He cant be in the reading room.I saw him on the playground just now.他不行能在阅览室里,我刚看到他在操场上。 对此时此刻正在进行的动作的推想: can/could no
13、t + be doing 不行能,想必不会在干某事 may/might not + be doing 可能没在干某事 They cant be telling the truth.他们不行能在说真话。 They may not be telling the truth.他们可能没在说真话。 对过去发生的事情的推想: can/could not + have +过去分词 不行能,想必不会做过某事 may/might not + have +过去分词 可能没干过某事 He cant have finished the work so soon.这项工作他不行能完成得这样快。 He may not
14、have achieved all his aims.But his effort is a good one.他可能没到达他的全部目的,但他还是认真做了努力的。 过去的一段时间内始终在进行的动作: cant /couldnt/may not have been doing He cant have been waiting for us so long.他不行能等我们那么长时间。 3疑问句中: 常用can/could来表示说话人的猜疑、怀疑或不愿定的语气 对当前行为、状况或状态的推想: can/could + 主语+ do/be Where can he be now? 他如今会在哪里呢?
15、Can it be true? 那会是真的吗? 对此时此刻正在进行的动作的推想: can/could +主语+ be doing Its so late.Can Tom be reading? 这么晚了,汤姆还在看书吗? What can he be doing? 他可能在做什么呢? 对过去发生的事情的推想: can/could +主语+have done Can she have told a lie? 她会不会说谎了? Where can she have gone? 她会上哪儿去了呢? 情态动词的辨析 need和dare 1.用作情态动词 Need he go yesterday? 昨天
16、他有去的必要吗? I dont think you need worry.She dare not go out alone at night.How dare you say Im unfair? 2.用作实义动词 She needs the work done before tomorrow.她必需在明天以前找人完成这项工作。 The table needs painting(to be painted.).I dare say hell come again.can 和be able to be able to 表示经过努力后, 能够做到;be able to 有多种形式的转变。 can
17、 1.表示体力或脑力方面的实力; 2.表示允许、可能性。 could 是can的过去式, 表示过去有实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 was able to get out.2.Will you stay for lunch? Sorry, I cant.My brother is coming to see me.must和have to must表示主观意志,而have to表示由于客观因素。 I told her that she must
18、give up smoking.We had to get everything ready that night.would和used to 1used to “过去常常, 与如今事实相反;would表过去意愿。 People used to think that the earth was flat.She would go out for a walk in the morning when she was in the country.1情态动词无论是表达“推想和可能性,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;对如今
19、或将来的事情进行 描述,用“情态 动词+动词或系动词原形。 2should(not)/ ought(not)to在中表示根据常规或常识推想,表示“某事应当或不应当 发生,语气比must或cant / couldnt稍弱。 3.can, could表达推想时,一般用于疑问句和否认句中;can用于确定句中表示一种理论 上的可能性,并不牵涉是否真的会发生,在这种用法中can只能与动词原形连用;could用于确定 句中,语气比 may/ might更弱。 4.must表达“情感、看法、语气主要有以下用法: (1)表示主观的义务和必要,主要用于确定句和疑问句,意思为“必需,得,要;由 must引起的疑问
20、句,确定回答要用must或have to,否认回答要用neednt或don t have to,意 思是“不必。另外,must与have to都可以表示“必需这一含义。must表示一 易错点点拨: 种主观的需要,而have to表示一种客观的需要,意思是“不得不,其否认形式是don have to。 (2)must用于条件句或疑问句中,可以用来表示责备、埋怨的感情色调,意思为“偏要,硬要、干 嘛。 5.在虚拟条件句中用以加强假设语气,表示“与将来事实相反的假设,用 If+主语+ should +动词 原形,当“万一(会)讲。这时可省略if,将should提到句首,变为倒装句式。If it sh
21、ould rain (=Should it rain)tomorrow, I would stay at home.万一明天下雨的话,我就待在家里。 6.should还可以用来表示说话人对某事不能理解、赶到意外、惊异等意思,译为“竟然,竟会。 You cant imagine that a well-behaved gentleman should be so rude to a lady.鱼儿,在水中串上串下,吐着顽皮的泡泡;鸟儿从荷叶上空飞过,想亲吻荷花姑娘的芳泽。四周的花儿,紫的,黄的,白的,红的,竞相开放。大红花儿,张着大嘴,放声歌颂;灯笼花儿,随风摇坠,四处飘香;剑兰花儿,形态独特,
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