高中英语 情态动词用法归纳全.ppt
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【高中语法复习】情态动词(共48张PPT)
need to do
need do
Need 的回答
Need I come here tomorrow ? Yes, you must.
No, you needn’t. / you don’t have to.
Johnny, you ____ play with the knife, or you ____ hurt yourself.
猜测
--Oh my god ! Can it be true ? --It can’t be ture.
常用词组积累 can not/ never…too; can’t…enough
can’t help doing
无论怎么…都不过分 禁不住;不由得
I could have worked out the question, but I was too nervous.(过去有能力做但未做)
I must take care of my hairstyle.
must 的回答
-不用mustn’t回答-
Must I go to school today?
Yes,you must !
No, you don’t have to. /needn’t. /had better not.
You mustn’t bully your brother. He must have seen the answer.
时态 单复数 肯定变否定
提问
3
情感和态度
can
could may
might must should
情态动词 情态实意
must, can, could, may, might, ought stohall, should, will, would
need do
Need 的回答
Need I come here tomorrow ? Yes, you must.
No, you needn’t. / you don’t have to.
Johnny, you ____ play with the knife, or you ____ hurt yourself.
猜测
--Oh my god ! Can it be true ? --It can’t be ture.
常用词组积累 can not/ never…too; can’t…enough
can’t help doing
无论怎么…都不过分 禁不住;不由得
I could have worked out the question, but I was too nervous.(过去有能力做但未做)
I must take care of my hairstyle.
must 的回答
-不用mustn’t回答-
Must I go to school today?
Yes,you must !
No, you don’t have to. /needn’t. /had better not.
You mustn’t bully your brother. He must have seen the answer.
时态 单复数 肯定变否定
提问
3
情感和态度
can
could may
might must should
情态动词 情态实意
must, can, could, may, might, ought stohall, should, will, would
情态动词用法归纳(全)PPT教学课件
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. I really must go now. 2. I had to work when I was your age.
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三、 must, have to
3) 表示推测、可能性(只用于肯定的陈述句)
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四、 dare, need
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.
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
一、 can, could
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. )
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。
高中情态动词课件大全.ppt
北京高考题)
--It ____ true because there was little snow there.
A. may not be
B. won’t be
C. couldn’t be
D. mustn’t be
Grammar ( 33ms )
modal verb
could(不用can)+have done,在肯定句中 表示“本来能够…而没能…”,具有婉转 的批评和责备之意。
2.must +be doing/do 表示对现在的动作进行 肯定推测 e.g.他现在一定在看小说.
He must be reading novels now. 他们买了一辆新车。 他们一定很有钱.
They have bought a new car. They must have a lot of money.
6. ---Linda has gone to work, but her bicycle is still here. ---She _m__a_y_(_m_i_g_h_t_)_h_a_v_e_g_o_n_e__ (go) by bus.
7. Mike _c_a_n_’_t_h_a_v_e_f_o_u_n_d__ his car, for he came to work by bus this morning. 迈克一定还没有找回他的车,因为早上他是坐 公共汽车来上班的。
she should be an excellent dancer.
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表示推测——情态动词的重要用法.
情态动词
对将来
肯定的推测
+ V.
must 常见must be
对现在
对过去
+ V.
--It ____ true because there was little snow there.
A. may not be
B. won’t be
C. couldn’t be
D. mustn’t be
Grammar ( 33ms )
modal verb
could(不用can)+have done,在肯定句中 表示“本来能够…而没能…”,具有婉转 的批评和责备之意。
2.must +be doing/do 表示对现在的动作进行 肯定推测 e.g.他现在一定在看小说.
He must be reading novels now. 他们买了一辆新车。 他们一定很有钱.
They have bought a new car. They must have a lot of money.
6. ---Linda has gone to work, but her bicycle is still here. ---She _m__a_y_(_m_i_g_h_t_)_h_a_v_e_g_o_n_e__ (go) by bus.
7. Mike _c_a_n_’_t_h_a_v_e_f_o_u_n_d__ his car, for he came to work by bus this morning. 迈克一定还没有找回他的车,因为早上他是坐 公共汽车来上班的。
she should be an excellent dancer.
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表示推测——情态动词的重要用法.
情态动词
对将来
肯定的推测
+ V.
must 常见must be
对现在
对过去
+ V.
高中情态动词课件大全
情态动词
不表示推测
表示推测
can could may might shall should must will would ought to
have to dare (daren’t) need (needn’t) used to
相当于情态动词的 have to, used to
可情态可实义的 need, dare/dared
情态动词有一定的意义,但没有人称和数的变化,不能独立使用,它和后面的动词构成谓语.
只作情态动词的 can/could, may/might, ought to, must
可情态可助动词的 shall/should, will/would
用于祈使句,表示祝愿。
表示推测——情态动词的重要用法.
肯定的推测 可能的推测 否定的推测 疑问的推测
must
对将来 对现在 对过去
情态动词
may, might
can’t, couldn’t
can, could
+ V. + V. + have done 常见must be + be doing
must 表示推测时, 只能用于肯定句。 e.g.这个电脑肯定出了问题。
You have worked hard all day. You must be tired.
must
There must be something wrong with the computer. 你努力学了一整天, 一定累了吧
3.can/could have done “本可以,本来可能已经”用于肯定句中,表示对过去发生的事情做出的判断. e.g.你本来可以考的更好。 You could have had a better mark.
高中英语情态动词各种用法课件(共47张PPT)
一 、表能力 :表现在的或一般的能力:表示 现在的或一般的能力用can 或 be able to. 一 般的能力是指你无论什么时候做什么事情就 能做到的能力。表示现在的能力或一般的能 力时,can比be able to 更普遍。
A computer can’t think for itself; it must be told what to do. (表示一般的能力)
This can’t / couldn’t be done by him. (表示不 相信)
He could be on his way home now. (could 不 如 may / might常用)
Can this be done by him? (表示一种疑惑、 惊讶)
(3)would, could, should, might 并不一定 与过去的时间有关,而是表示可能性弱于他 们相应的现在形式。如:
do something / succeeded in doing sth.
The fire spread through the hotel very
quickly but everyone was able to get out. (过去有能力并成功地做了某事)
(3) could have + 过去分词,表示过去有 能力做但未做。
表示对过去已经发生的行为进行推测,意为 “想必 / 准是/ 一定做了某事
It must have rained last night, for the road was quite muddy.
The lights were out. They must have been asleep.
2. can have done
高中英语情态动词PPT课件
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very uncertain
almost certain
might may could (can) should ought to will must
1.He _____ be at home.
A.may B.might C.must
2.He _____ be at home, for he just called me from his home 15 seconds ago.
Would rather…
第20页/共37页
will/would:
2.表示意志、愿望和决心。 有愿意,要的意思,will指 现在,would指过去的习惯 性动作或倾向。
I will never do that again.
I would go there with you.
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will/would:
can表示与生俱来的能力或一种客观可能,而 be able to更加强调通过后天的学习和努力获 得的能力,或者在某个客观的场合和背景下, 能做到的事情。
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advisability
necessity
ought to/should
have to
must
Your mother brings you up and takes good care of you, so when she is old, you ___ look after her in return.
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4.Permission(允许) may/might:
1. 表示许可,常译为可以。表示请 求、允许时,might比may的语气 -更Mi委gh婉t/一M些ay。I use your computer? - Yes, you can. /No, you can’t/mustn’t.
very uncertain
almost certain
might may could (can) should ought to will must
1.He _____ be at home.
A.may B.might C.must
2.He _____ be at home, for he just called me from his home 15 seconds ago.
Would rather…
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will/would:
2.表示意志、愿望和决心。 有愿意,要的意思,will指 现在,would指过去的习惯 性动作或倾向。
I will never do that again.
I would go there with you.
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will/would:
can表示与生俱来的能力或一种客观可能,而 be able to更加强调通过后天的学习和努力获 得的能力,或者在某个客观的场合和背景下, 能做到的事情。
第8页/共37页
advisability
necessity
ought to/should
have to
must
Your mother brings you up and takes good care of you, so when she is old, you ___ look after her in return.
第15页/共37页
4.Permission(允许) may/might:
1. 表示许可,常译为可以。表示请 求、允许时,might比may的语气 -更Mi委gh婉t/一M些ay。I use your computer? - Yes, you can. /No, you can’t/mustn’t.
情态动词用法归纳(全)PPT教学课件
如果天不那么黑,你可能从这儿望见它的。(实际上已望不见)
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3)表示请求和允许.
eg. You can borrow my bike tomorrow 明天你可以借用我的自行车
表这个意义时,can 用于疑问句时表要求,用于否定句时表不许,如:
Can you lend me a hand ?
This sort of thing can't go on!
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• 一: can (could)的形式和用法 时态 现在时 过去式 肯定式 can could 否定式 cannot could not 缩略否定式 can't couldn't
2
一、 can, could
1) 表示能力(体力、知识、技能)。
Can you lift this heavy box?(体力)
情态动词用法归纳
情态动词的含义和特征
情态动词只有情态意义,即它所表示的是说话人对动作 的观点,如需要,可能,意愿或怀疑等。 情态动词有以下特征: 1) 在形式上,情态动词没有实义动词的各种变化,只有 could,would,had to ,was(或were)to,might 等几个过去式,其他如must,ought to 等的过去式皆与 现在式同型。 2) 在意义上,大多数情态动词有多个意义,如can可表 “能够”“可能”“允许”等。 3) 在用法上,情态动词与助动词一样,后面须接动an speak three languages.(知识)
Can you skate?(技能) 备注: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。 eg: I’ll not be able to come this afternoon.
高中英语高考高考英语语法总复习课件:情态动词课件 (共33张PPT)
done
would r ather
(而做了) 本不必做
(而做了)
宁愿当时没做
her the secr et. You needn ’t have taken a taxi, for it was near to my
house. I would r ather not have
not have done (后悔当时做了) scolded my son.
• 3. 表示习惯性的动作或倾向,“总是,常常”
•
例:When I was a little child, I would go swimming with
•
other children in summer.
• used to do过去常常现在不做了
• would do过去常常有可能现在还在做
• 5. need/dare • 情态动词:没有人称和数的变化,直接接动词原形, • 构成否定和疑问时不用助动词。 • 实意动词:有人称和数的变化,构成否定和疑问时借 • 助助动词do,does,did • 口诀: need,dare真诡异,既有情态又实意。 • 情态动词把to退,实意动词to跟随。 • need doing是特例,=need to be done需牢记。
need to do
• need /want/ requir doing表被动=need /want/ requir to be done
• shall • 1. 征求对方意见或建议,用于第一、第三人称。 • 例:Shall we go now? • 2. 表示允诺、警告、命令,用于第一,二、三人称。 • 例:All of us shall arrive before 5 o’clock. • 3. 表示规章、法令、制度的规定,“必须”=must law,rule做主语时 • 例:The law of Venice says that if anyone tries to kill or • murder any citizen of Venice, everything that he owns shall • be taken away from him.
would r ather
(而做了) 本不必做
(而做了)
宁愿当时没做
her the secr et. You needn ’t have taken a taxi, for it was near to my
house. I would r ather not have
not have done (后悔当时做了) scolded my son.
• 3. 表示习惯性的动作或倾向,“总是,常常”
•
例:When I was a little child, I would go swimming with
•
other children in summer.
• used to do过去常常现在不做了
• would do过去常常有可能现在还在做
• 5. need/dare • 情态动词:没有人称和数的变化,直接接动词原形, • 构成否定和疑问时不用助动词。 • 实意动词:有人称和数的变化,构成否定和疑问时借 • 助助动词do,does,did • 口诀: need,dare真诡异,既有情态又实意。 • 情态动词把to退,实意动词to跟随。 • need doing是特例,=need to be done需牢记。
need to do
• need /want/ requir doing表被动=need /want/ requir to be done
• shall • 1. 征求对方意见或建议,用于第一、第三人称。 • 例:Shall we go now? • 2. 表示允诺、警告、命令,用于第一,二、三人称。 • 例:All of us shall arrive before 5 o’clock. • 3. 表示规章、法令、制度的规定,“必须”=must law,rule做主语时 • 例:The law of Venice says that if anyone tries to kill or • murder any citizen of Venice, everything that he owns shall • be taken away from him.
高中英语语法情态动词完整ppt课件
过去不应该做而实际上做了 (6)needn’t have done 本没有必要做的事实际却做了 (7)could have done
本来能够做的(有能力做)事实际却未做到 (8)must +be doing∕do 表示对现在的动作进行肯定推
测
.
37
• 他现在一定在看小说.
He must be reading novels now. • 他们买了一辆新车。 他们一定很有钱. They have bought a new car. They
.
10
2.Obligation (义务): I’m so tired! I have to do the training for at least 10 hours a day!
Although Liu Xiang is
so gifted in hurdle
race…
…yet he must work
.
26
will/would:
2.表示意志、愿望和决心。 I will never do that again.
.
27
will/would:
3.可表示经常性、习惯性、倾向 性。翻译为“经常、惯于、总是”。
1).The old man
_wo_u_ld____have a
smoke under a
big tree every
.
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5.Making requests (提出要求): formal
informal
will
can
could
would
I don’t know how to use this
equipment!
Can you help me with my training?
本来能够做的(有能力做)事实际却未做到 (8)must +be doing∕do 表示对现在的动作进行肯定推
测
.
37
• 他现在一定在看小说.
He must be reading novels now. • 他们买了一辆新车。 他们一定很有钱. They have bought a new car. They
.
10
2.Obligation (义务): I’m so tired! I have to do the training for at least 10 hours a day!
Although Liu Xiang is
so gifted in hurdle
race…
…yet he must work
.
26
will/would:
2.表示意志、愿望和决心。 I will never do that again.
.
27
will/would:
3.可表示经常性、习惯性、倾向 性。翻译为“经常、惯于、总是”。
1).The old man
_wo_u_ld____have a
smoke under a
big tree every
.
20
5.Making requests (提出要求): formal
informal
will
can
could
would
I don’t know how to use this
equipment!
Can you help me with my training?
高中英语语法情态动词(28张PPT)-经典通用课件资料
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4. Tom ought not to ___ me your secret,
but he meant no harm.
A. have told
B. tell
C. be telling
D. having told
答案A 由于后句为过去时,告诉秘密的动作又发生在其前因,此地应用过去完成时,但它在情态动词 ought to 后,所以用have。
Must I go there in person? 我必须亲自去吗? We must always follow the Party.我们要永远跟着党走。 ②表示“必然”
All men must die.人总是要死的。 ③表示推测,“准是”、“一定”,否定形式为can’t
She must be at home now.她现在准在家。
- May I come in? -Might I go to the hospital to see my father? ②否定形式为may not, 但表示“不可以”或“禁止”时用must not (mustn’t). e.g.-May I watch TV now?我现在可以看电视吗? -No, you mustn’t. 不,你不可以看。 ③ may, might还可以表示推测,但might可能性比may 小。 e.g. There may be a few copies left in the bookstore. 书店里可能还有几本书。 They might have been killed by radiation. ④may 放在句首, 表示祝愿。 e.g. May God bless you!
e.g. You don’t have to tell him about it. 你没必要把此事告诉他。
高中英语语法 情态动词用法总结(20张PPT)-经典通用课件资料
A. could B. would C. should D. might
C
2. What do you mean, there are only ten tickets? There_____
A. should CA. will
B. would D. shall
be twelve.
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5. must
1. 表示义务或强烈的劝告,意为“必须”“应该”, 其否定式表示“不应该”“不许可” “不准”“禁止”。
Eg: 1) You must finish your homework first. 2) Children mustn’t speak like that to their parents.
3. 表推测,用于肯定句,意为“一定”“务必”。
Eg: 1) Betty must be in the next room. 2) He must be watering the flowers in his garden.
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Complete the following sentences using modal verbs.
5) Can/Could I use your dictionary? 6) Could you lend me a hand?
3. 表示“请求” “允许”(表请求时,口语中常用 could 代替 can 使语气更委婉,回答时用can)
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4. 表示“许可”,可与may 换用。 You can go home now.
1. 表“请求、建议”等,用 would 比用will 委婉,客气些 Eg: 1)Will you lend me your book? 2) Would you like a cup of tea?
高中英语情态动词课件
第7页/共27页
第八页,共27页。
3 must 语 have to 的 用法(yònɡ fǎ)
1 You must come to school on time . You mustn't waste any more time(必须(bìxū),禁止)
2 Must I come back before ten ?
第15页/共27页
第十六页,共27页。
You ought to have helped him with hisCEnglish, ____you ?
A. won’t you B. ought not you C. shouldn’t you D. wouldn’t you
第16页/共27页
第5页/共27页
第六页,共27页。
2 may / might
1 May I watch Tv after supper? Yes you may /No ,you mustn't.(请求(qǐngqiú)许可 2 It may be true ./ she may come tomorrow / He might have some fever(推测) 3 May you succeed ! May you have many more days as happy as this one(祝愿)
第十五页,共27页。
------When can I come for the photos ? I need them tomorrow afternoon.
-----They ___B__be ready by 12 : 00 . (
A. can
B. should
C. might D. need
第八页,共27页。
3 must 语 have to 的 用法(yònɡ fǎ)
1 You must come to school on time . You mustn't waste any more time(必须(bìxū),禁止)
2 Must I come back before ten ?
第15页/共27页
第十六页,共27页。
You ought to have helped him with hisCEnglish, ____you ?
A. won’t you B. ought not you C. shouldn’t you D. wouldn’t you
第16页/共27页
第5页/共27页
第六页,共27页。
2 may / might
1 May I watch Tv after supper? Yes you may /No ,you mustn't.(请求(qǐngqiú)许可 2 It may be true ./ she may come tomorrow / He might have some fever(推测) 3 May you succeed ! May you have many more days as happy as this one(祝愿)
第十五页,共27页。
------When can I come for the photos ? I need them tomorrow afternoon.
-----They ___B__be ready by 12 : 00 . (
A. can
B. should
C. might D. need
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情态动词用法归纳
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
----No, it can’t be our teacher. He is on a visit to the Great Wall.
例 --- I think Miss Gao must be in the library. She said she would go there. ----- No. She __ be there, I have just been there. A.can’t B.mustn’t C.needn’t D.wouldn’t
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.
must 表示主观看法,意为“必须、应该” 表示有把握的推测,用语肯定句
Need 表示需要、必须,主要用于否定句和疑问句中 dare 表示敢于,主要用于否定句和疑问句中 should 意为“ 应该”, 表示要求和命令
表示劝告、建议 had better 意为 “最好”,表示建议 used to 意为 “过去常常,表示过去的动作、行为
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. I really must go now. 2. I had to work when I was your age.
三、 must, have to
3) 表示推测、可能性(只用于肯定的陈述句)
六、 will, would
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.
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
七、should, ought to
总结归纳
考点一 can ,may, must 等情态动词在陈述句中的用法
1. can 的用法 (1)表示能力、许可、可能性。 表示能力时一般译为“能、会”, 即
有种能力,尤其是生来具备的能力,此时may 和must 均不可代替它。 如:
She can swim fast, but I can’t . 她能游得很快,但我不能。 I can see with my eyes. 我用眼睛看。 (2) 表示可能、能够。 如: I can finish it in an hour. 我能在一小时后完成它。 (3)表示许可,常在口语中。如: You can use my dictionary. 你可以用我的字典。 (4) 表示推测,意为“可能”, 常用于否定句和疑问句中, 此时can’t 译为“ 不可能”。 如: Can the news be true? 这个消息会是真的吗? ----Can it be our teacher? 那个人有可能是我们老师吗?
2. could的用法
(1)can的过去式, 意为“ 能、 会” , 表示过去的能力。 如: He could write poems when he was 10. 他十岁时就会 写诗。
(2)could 在疑问句中, 表示委婉的语气, 此时 could 没 有过去式的意思。如: Could you do me a favour? 你能帮我个忙吗? ---Could I use your pen? 我能用一下你的钢笔吗? --Yes, you can. 可以。
一、 can, could
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。
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.
口语中更常见。
2)用于祈使句,表示祝愿。 May you succeed!
二、 may, might
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.
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
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)
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
一、 can, could
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. )
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.
四、 dare, need
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?
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
----No, it can’t be our teacher. He is on a visit to the Great Wall.
例 --- I think Miss Gao must be in the library. She said she would go there. ----- No. She __ be there, I have just been there. A.can’t B.mustn’t C.needn’t D.wouldn’t
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.
must 表示主观看法,意为“必须、应该” 表示有把握的推测,用语肯定句
Need 表示需要、必须,主要用于否定句和疑问句中 dare 表示敢于,主要用于否定句和疑问句中 should 意为“ 应该”, 表示要求和命令
表示劝告、建议 had better 意为 “最好”,表示建议 used to 意为 “过去常常,表示过去的动作、行为
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. I really must go now. 2. I had to work when I was your age.
三、 must, have to
3) 表示推测、可能性(只用于肯定的陈述句)
六、 will, would
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.
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
七、should, ought to
总结归纳
考点一 can ,may, must 等情态动词在陈述句中的用法
1. can 的用法 (1)表示能力、许可、可能性。 表示能力时一般译为“能、会”, 即
有种能力,尤其是生来具备的能力,此时may 和must 均不可代替它。 如:
She can swim fast, but I can’t . 她能游得很快,但我不能。 I can see with my eyes. 我用眼睛看。 (2) 表示可能、能够。 如: I can finish it in an hour. 我能在一小时后完成它。 (3)表示许可,常在口语中。如: You can use my dictionary. 你可以用我的字典。 (4) 表示推测,意为“可能”, 常用于否定句和疑问句中, 此时can’t 译为“ 不可能”。 如: Can the news be true? 这个消息会是真的吗? ----Can it be our teacher? 那个人有可能是我们老师吗?
2. could的用法
(1)can的过去式, 意为“ 能、 会” , 表示过去的能力。 如: He could write poems when he was 10. 他十岁时就会 写诗。
(2)could 在疑问句中, 表示委婉的语气, 此时 could 没 有过去式的意思。如: Could you do me a favour? 你能帮我个忙吗? ---Could I use your pen? 我能用一下你的钢笔吗? --Yes, you can. 可以。
一、 can, could
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。
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.
口语中更常见。
2)用于祈使句,表示祝愿。 May you succeed!
二、 may, might
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.
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
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)
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
一、 can, could
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. )
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.
四、 dare, need
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?