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情态动词的用法

时间:2016-10-31 04:17来源:互联网 提供网友:mapleleaf   字体: [ ]
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    (单词翻译:双击或拖选)

   情态动词有can (could), may (might), must, have to, shall1 (should, will (would), dare2 (dared3), need (needed), ought4 to等。 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语。

  一、 can, could
  1) 表示能力(体力、知识、技能)。
  Can you lift this heavy box?(体力)
  Mary can speak three languages.(知识)
  Can you skate?(技能)
  此时可用be able to代替。Can只有一般现在时和一般过去式;而be able to则有更多的时态。
  I'll not be able to come this afternoon.
  当表示“经过努力才得以做成功某事”时应用be able to,不能用Can。如:
  He was able to go to the party yesterday evening in spite5 of the heavy rain.
  2) 表示请求和允许。
  -----Can I go now?
  ----- Yes, you can. / No, you can't.
  此时可与may互换。在疑问句中还可用could,might代替,不是过去式,只是语气更委婉,不能用于肯定句和答语中。
  ---- Could I come to see you tomorrow?
  ---- Yes, you can. ( No, I'm afraid not. )
  3) 表示客观可能性(客观原因形成的能力)。
  They've changed the timetable, so we can go by bus instead.
  This hall can hold 500 people at least.
  4) 表示推测(惊讶、怀疑、不相信的态度),用于疑问句、否定句和感叹句中。
  Can this be true?
  This can't be done by him.
  How can this be true?
  二、 may, might
  1) 表示请求和允许。might比 may语气更委婉,而不是过去式。否定回答时可用can't或mustn't,表示“不可以,禁止”。
  ----Might/ May I smoke in this room?
  ---- No, you mustn't.
  ---- May/Might I take this book out of the room?
  ---- Yes, you can. (No, you can't / mustn't. )
  用May I...?征徇对方许可时比较正式和客气,而用Can I...?在口语中更常见。
  2)用于祈使句,表示祝愿。
  May you succeed!
  3) 表示推测、可能性(不用于疑问句)。
  might不是过去式,它所表示的可能性比may小。
  1.He may /might be very busy now.
  2.Your mother may /might not know the truth.
  三、 must, have to
  1) 表示必须、必要。
  You must come in time.
  在回答引出的问句时,如果是否定的,不能用mustn't(禁止,不准),而用needn't, don't have to(不必).
  ---- Must we hand in our exercise books today?
  ---- Yes, you must.
  ---- No, you don't have to / you needn't.
  2) must是说话人的主观看法, 而have to则强调客观需要。Must只有一般现在时, have to 有更多的时态形式。
  1. he play isn't interesting, I really must go now.
  2. I had to work when I was your age.
  3) 表示推测、可能性(只用于肯定的陈述句)
  1. You're Tom's good friend, so you must know what he likes best.
  2. Your mother must be waiting for you now.
  四、 dare, need
  1) dare作情态动词用时, 常用于疑问句、否定句和条件从句中, 过去式形式为dared。
  1. How dare you say I'm unfair?
  2. He daren't speak English before such a crowd, dare he?
  3. If we dared not go there that day, we couldn't get the beautiful flowers.
  2) need 作情态动词用时, 常用于疑问句、否定句。在肯定句中一般用must, have to, ought to, should代替。
  1.You needn't come so early.
  2. ---- Need I finish the work today?
  ---- Yes, you must. / No, you needn't.
  3) dare和 need作实义动词用时, 有人称、时态和数的变化。在肯定句中,dare后面常接带to的不定式。在疑问句和否定句中,dare后面可接带to或不带to的不定式。而need后面只能接带to的不定式。
  1. I dare to swim across this river.
  2. He doesn't dare (to) answer.
  3. He needs to finish his homework today.
  五、 shall, should
  1) shall 用于第一人称,征求对方的意见。
  What shall we do this evening?
  2) shall 用于第二、三人称,表示说话人给对方的命令、警告、允诺或威胁。
  1. You shall fail if you don't work hard.(警告)
  2. He shall have the book when I finish it.(允诺)
  3. He shall be punished6.(威胁)
  六、 will, would
  1) 表示请求、建议等,would更委婉。
  Will / Would you pass me the ball, please?
  2) 表示意志、愿望和决心。
  1. I will never do that again.
  2. They asked him if he would go abroad.
  3) would表示过去反复发生的动作或某种倾向。would表示过去习惯时比used to正式,且没有“现已无此习惯”的含义。
  1. During the vacation, he would visit me every other day.
  2. The wound7 would not heal8.
  4) 表示估计和猜想。
  It would be about ten o'clock when she left home.
  七、 should, ought to
  1) should, ought to表示“应该”,ought to表示义务或责任,比should语气重。
  1. I should help her because she is in trouble.
  2. You ought to take care of the baby.
  2) 表示劝告、建议和命令。should, ought to可通用,但在疑问句中常用should。
  1. You should / ought to go to class right away.
  2. Should I open the window?
  3) 表示推测
  should , ought to (客观推测), must(主观推测)。
  1.He must be home by now. (断定他已到家)
  2.He ought to/should be home by now.(不太肯定)
  3. This is where the oil9 must be.(直爽)
  4. This is where the oil ought to/should be.(含蓄)
  八、 情态动词+不定式完成式(have done)
  1) can / could + have done在肯定句中表示“本来可以做而实际上能做某事”,是虚拟语气;在疑问句或否定句中表示对过去行为的怀疑或不肯定, 表示推测。
  1. You could have done better, but you didn't try your best. (虚拟语气)
  2. He can't have been to that town.(推测)
  3. Can he have got the book?(推测)
  2) may / might +不定式完成式(have done)
  表示对过去行为的推测。不能用于疑问句中,没有虚拟语气的用法。Might所表示的可能性比may小。
  1. He may not have finished the work .
  2. If we had taken the other road, we might have arrived earlier.
  3)must +不定式完成式(have done)
  用于肯定句中,表示对过去行为的推测。意为“一定、想必”。其疑问、否定形式用can,can't代替。参看1) can / could + have done表示推测。
  1. You must have seen the film Titanic10.
  2. He must have been to Shanghai.
  4)should +不定式完成式(have done)
  用于肯定句中,表示对过去行为的推测。
  He should have finished the work by now。
  表示“本应该做而实际上没有做某事”,其否定式表示某种行为本不该发生却发生了。可以与ought to +不定式完成式(have done)互换。
  1. You ought to / should have helped him. (but you didn't.)
  2. She shouldn't have taken away my measuring11 tape, for I wanted to use it.
  5) needn't +不定式完成式(have done)
  表示“本来不必做而实际上做了某事”。
  You needn't have watered the flowers, for it is going to rain.
  6) will +不定式完成式(have done)
  主要用于第二、三人称,表示对已完成的动作或事态的推测。
  He will have arrived by now.

点击收听单词发音收听单词发音  

1 shall lzFwQ     
v.aux.(主要用于第一人称)将
参考例句:
  • I shall always love you.我将永远爱你。
  • Which club shall we join?我们要参加哪个社团?
2 dare qybxH     
n.敢,挑战;aux.敢;vi.敢;vt.敢于,勇于面对
参考例句:
  • He didn't dare to look at her in the face.他不敢正眼看她。
  • How dare you?Take your hand off me at once.放肆!马上把你的手挪开。
3 dared 911cd3dc5fab92f39395e0b8472ced59     
v.敢( dare的过去式和过去分词 );敢做;激(某人做某事);问(某人)有没有胆量(做某事)
参考例句:
  • She said it as loudly as she dared. 她壮着胆子大声说了出来。
  • I wouldn't have dared to defy my teachers. 我可不敢不听老师的话。
4 ought XJKx4     
v.aux.应该,大概;n.责任
参考例句:
  • Ought I to hand in the homework today?我应当在今天交上作业吗?
  • They ought to be here by now.他们这个时候该到了。
5 spite uv7wD     
n.(用于短语)虽然,不顾,尽管
参考例句:
  • He has modern ideas in spite of his great age.尽管他年事很高,但思想观念却很入时。
  • In spite of his anger,his remarks were restrained.他尽管生气,说的话还是有节制的。
6 punished 75ba4967f948e37391b75d69039d91f3     
v.罚( punish的过去式和过去分词 );处罚;粗暴地对待;痛打
参考例句:
  • He was punished for disobeying orders. 他因违抗命令而受到惩罚。
  • Those responsible for this crime will be severely punished. 犯下这宗罪行的人将受到严厉惩罚。
7 wound 3erzJ5     
n.创伤,伤口,伤疤,伤害,痛苦;vt.伤害,损害,使受伤;vi.打伤,伤害;wind的过去式和过去分词
参考例句:
  • There was a gush of blood from the wound.血从伤口流出。
  • The nurse gently mopped the blood from the wound.护士轻轻地抹去伤口上的血。
8 heal Fd9xt     
v.使愈合,治愈,使康复;平息(争吵等);消除,解决(分支等)
参考例句:
  • Time helped heal the old wounds.时间有助于治愈旧创伤。
  • This wound will soon heal if yon keep it clean.如果你保持伤口清洁,它很快就会痊愈。
9 oil IIJx5     
n.油,油画颜料;v.涂油,溶化,加油
参考例句:
  • China is rich in oil resources.中国的石油资源丰富。
  • It might need some oil.它大概需要一些油。
10 titanic NoJwR     
adj.巨人的,庞大的,强大的
参考例句:
  • We have been making titanic effort to achieve our purpose.我们一直在作极大的努力,以达到我们的目的。
  • The island was created by titanic powers and they are still at work today.台湾岛是由一个至今仍然在运作的巨大力量塑造出来的。
11 measuring 0e401dadfbcdafcb1e88c9ab901a96c0     
v.量( measure的现在分词 );测量;衡量;量出
参考例句:
  • an earthquake measuring 7.3 on the Richter scale 里氏7.3级的地震
  • Many people are confused about the new ways of measuring temperature. 许多人都搞不清测定温度的新方法。 来自《简明英汉词典》
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