情态动词表可能中,can的否定句和疑问句可以加一个具体的事,而can的肯定句和否定句不行是什么意思

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can表猜测时只用疑问句中吗 能不能用否定句中
禽兽TA0862
不能理解你想说什么.疑问句本身很多本身就可能带猜测的意思,不然怎么叫疑问句?.所以在疑问句表猜测没什么奇惯的.I can be better .can在这里也带有猜测的意思.语气却比may 强很多.u cannt do it well.这里也是.肯定性很强的猜测.
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其他类似问题
是的,can做情态动词表推测时常用于否定句和疑问句中,不用于肯定句
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【英语】图表讲解:情态动词
  作者:佚名  来源:试题调研整理  更新时间: 16:18  点击:3470
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& 情态动词
I. 情态动词基本用法:
II. 情态动词must, may, might, could, can表示推测:
以must为例。must + do(be)是推测现在存在的一般状态进行;must + be doing 推测可能正在进行的事情;must +have done是推测可能已经发生过的事情。
1. must&肯定,一定&语气强,只用于肯定句中。
He must be a man from America. / He must be talking with his friend. / He must have already arrived there.
2. may和might&也许&,后者语气弱,更没有把握。可用于肯定句和否定句。
He may not be at home. / They might have finished their task.
3. can和could&可能&,could表示可疑的可能性,不及can&t语气强,用于肯定、否定、疑问句中。
The weather in that city could be cold now.
We cou it was so near.(推测某事本来可能发生,但实际上没有发生)
Can he be in the office now? No, he can&t be there, for I saw him in the library just now.(语气很强,常用于疑问句和否定句中)
III. 情态动词注意点:
1. can和be able to: 都可以表示能力。但be able to可以表达&某事终于成功&,而can无法表达此意。Be able to有更多的时态。另外,两者不能重叠使用。
2. used to和would:& used to表示过去常常做现在已经不再有的习惯,而would只表示过去的习惯或喜好,不涉及现在。
3. need和dare作情态动词和实义动词的区别:
两者作情态动词时常用于否定句和疑问句。其形式为:needn&t/daren&t do;Need/dare&do&?
做实义动词时可用于肯定句,否定句和疑问句。其形式为:need(needs/needed)/dare(dares/dared) to do, don&t(doesn&t/didn&t) need/dare to do
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&& 新o新概念
情态动词的基本用法归纳
作者:网编整理&&来源:新东方论坛&&时间:
  情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought 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 spite 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 punished.(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 wound would not heal.
  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 oil 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 Titanic.
  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 measuring 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.
  (责任编辑:胡静平)
经营许可证编号:060601京ICP备京公安备:情态动词can、may、must的横向辨析_智康教育吧_百度贴吧
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情态动词can、may、must的横向辨析收藏
英语情态动词对中国学生来说,确实是一个费解的语法项目。其主要原因是中国学生缺少语境和意境;其次,课本和语法书只是逐个讲述每个情态动词的用法,缺少对每个情态动词之间意义上的横向比较。为了帮助读者清晰地区分它们之间的差异,达到正确运用的目的,笔者就“can、may、must”三个情态动词进行横向对比。
一、表示“能力”。
l.只可用can(could)。may、must则无此种含义。
例:①I can swim
now,but I couldn’t last year.
&&& ②Can you play me piano?Yes,I
2.can(could)适用于各种句型和人称。
例:①肯定句:I(You,He)can
&&& ②否定句:I(You,He)can’t swim.
&&& ③疑问句:Can
I(you,he)swim?
二、表示“请求”或“许可”。can、may、must都可用,但语气和程度不同。
1.can(could)用于各种句型和大部分人称。
例:①肯定句:You(He,We)can go now.
&&& ②否定句:You(He,We)can’t go now.
&&& ③疑问句:Can I(you,he)go
Yes,you can.(No,you can’t.)
2.may(might)用于各种句型,但在肯定句和否定句中不用于第一人称;在疑问句中不用于第二人称。
例:①肯定句:You(He)may
&&& ②否定句:You(He)may not go now.
&&& ③疑问句:May
I(he)go now?
正规回答:(表定)Yes,you may.
(否定)No,you may
not.(No,you can’t./No,you mustn’t.)
口语化回答:(肯定)Yes,please.(Certainly.)
(否定)No,please don’t.(No,of course
3.must用于各种句型和大部分人称。
例:①肯定句:I(You,He)must go
&&& ②否定句:You(He)mustn’t go now.
&&& ③疑问句:Must(you,he)go now?
肯定回答:Yes,you must.
否定回答:No,you needn’t.(No,you don’t have to.)
4.试比较:
not smoke here.(不可以)语气轻
You can’t smoke here.(不能)重
mustn’t smoke here.(决不可)最重
三、表示“可能”、“或许”和“推测”之意。can、may、must都可用,但语气和程度不同。
(could)常用于否定句和疑问句中,could表示的“可能性”更小。
例:①否定句:It couldn’t be him,for
he’s at the library.
&&& ②疑问句:Can he have gone out?
What can they be doing now?
2.may(might)用于肯定句和否定句中,might表示的“可能性”更小。
例:①肯定句:He may be
&&& ②否定句:She might not have come yet.
3.must用于肯定句中。
例:①You must be very hungry.(对现在情况猜测)
&&& ②Aqiao must have met a fairy.(对过去事实的猜测)
&&& ③Everything is clean
and tidy.Someone must have cleaned my room.(同上)
4.试比较:
might not have gone out.(或许没有)
He can’t have gone out.(不可能)
He must have been in the room.(一定、准是)
以上三句可能性逐渐加大至肯定。
一、说明下列句中情态动词的含义。(A.能力;B.许可;C.猜测)。
(&& ) l. “You must
write more neatly,” said the teacher.
(&& ) 2. He’s not in the
office.He must have gone to the meeting.
(&& ) 3. Visitors mustn’t
move and touch the exhibits.
(&& ) 4. The girl can play the violin
very well.
(&& ) 5. Can I smoke here?
二、用can(could),may(might),must填充。
1. When I was young,I_____ run very
2. What _____ I do for you,Li Hat?
3. I wonder where
Ann is.She _________ be with Dick,I think.
4. A:That pen _______ be
B:No,it _______(not)be his.
5. Could I use your
phone?Yes,of course you _________.
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