高中英语情态动词课件精品
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高中英语 情态动词用法归纳(全).ppt
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.
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。
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
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.
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)
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.
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。
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
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.
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)
【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
高中英语情态动词课件精品53页PPT
高中英语情态动词课件精品
46、法律有权打破平静。——马·格林 47、在一千磅法律里，没有一盎司仁 爱。— —英国
48、法律一多，公正就少。——托·富 勒 49、犯罪总是以惩罚相补偿；只有处 罚才能 使犯罪 得到偿 还。— —达雷 尔
50、弱者比强者更能得到法律的保护 。—— 威·厄尔
56、书不仅是生活，而且是现在、过 去和未 来文化 生活的 源泉。 ——库 法耶夫 57、生命不可能有两次，但许多人连一 次也不 善于度 过。— —吕凯 特 58、问渠哪得清如许，为有源头活水来 。—— 朱熹 59、我的努力求学没有得到别的好处， 只不过 是愈来 愈发觉 自己的 无知。 ——笛 卡儿
拉
60、生活的道路一旦选定，就要பைடு நூலகம்敢地 走到底 ，决不 回头。 ——左
46、法律有权打破平静。——马·格林 47、在一千磅法律里，没有一盎司仁 爱。— —英国
48、法律一多，公正就少。——托·富 勒 49、犯罪总是以惩罚相补偿；只有处 罚才能 使犯罪 得到偿 还。— —达雷 尔
50、弱者比强者更能得到法律的保护 。—— 威·厄尔
56、书不仅是生活，而且是现在、过 去和未 来文化 生活的 源泉。 ——库 法耶夫 57、生命不可能有两次，但许多人连一 次也不 善于度 过。— —吕凯 特 58、问渠哪得清如许，为有源头活水来 。—— 朱熹 59、我的努力求学没有得到别的好处， 只不过 是愈来 愈发觉 自己的 无知。 ——笛 卡儿
拉
60、生活的道路一旦选定，就要பைடு நூலகம்敢地 走到底 ，决不 回头。 ——左
高中英语情态动词精品PPT课件
— Might I watch TV after supper? — Yes, you ________. A. may B. must C. might D. could
.
11
3.表推测，表示主观上的推测，“可能，
也许”，不用于疑问句, might比
may的可能性更小
She may not like this place.
—Yes, he _______. A. need B. must C. may D. will
.
15
2. must表示肯定的推测。 The light is still on, so he must be at home.
Look at his new car. He ______ have a lot of money. A. should B. shall C. may D. must
I can’t believe my eyes. Such well-educated
gentleman ____ behave like this!
A.will B. would C. should D. must
What time ought I _______?
A．arrived
B．arriving
C．arrive
D．to arrive
He _______ speak to his mother like that. A．ought not to B．doesn’t ought to C．not ought to D．ought to not
.
22
1. should= ought to 表示劝告，建议，意 为“应该”， ought to 语气更强些，强调“有责任，有 义务做”
高中英语情态动词 课件(共22张PPT)
A. could have led B. would lead C. should have led D. must lead
【答案】A
情态动词
考点链接
请用合适的情态动词及括号内所给动词的适 当形式填空。
(1)—Tom graduated from college at a very young age.
2. He might have given you more help, but he was busy then.
情态动词
3. He abandoned a career that ______ to his becoming one of the most influential people in the world.
【答案】C
情态动词
1. Since this road is wet and slippery this morning, it _____ last night.
A. Must rain B. was raining C. Must have rained D. may rain 【答案】C
2. I believe he _____ an accident, otherwise he would have arrived on time.
(3)—Need I go with you to the office？ (肯定回答)
—____________. 【答案】 Yes，you must
情态动词
(4)—Might I have talk with you this evening？(肯定回答) —____________. 【答案】 Yes，you can/may
A. to report B. to have reported C. to reporting D. have reported 【答案】B
【答案】A
情态动词
考点链接
请用合适的情态动词及括号内所给动词的适 当形式填空。
(1)—Tom graduated from college at a very young age.
2. He might have given you more help, but he was busy then.
情态动词
3. He abandoned a career that ______ to his becoming one of the most influential people in the world.
【答案】C
情态动词
1. Since this road is wet and slippery this morning, it _____ last night.
A. Must rain B. was raining C. Must have rained D. may rain 【答案】C
2. I believe he _____ an accident, otherwise he would have arrived on time.
(3)—Need I go with you to the office？ (肯定回答)
—____________. 【答案】 Yes，you must
情态动词
(4)—Might I have talk with you this evening？(肯定回答) —____________. 【答案】 Yes，you can/may
A. to report B. to have reported C. to reporting D. have reported 【答案】B
高中英语语法专题复习课件--情态动词(共22张PPT)
but one of them 8. __c_o_u_ld___ (must, could) be your last. Decisions! Decisions! You may ask: 9. __m__u_st___ (can, must) I make decisions? The answer is yes. In most cases, you 10. __c_a_n_'_t__ (can't, needn't) skip this process.
_m__ig_h_t___ (shall, might) become the
richest.
(江西2014)
5. George __c_a_n_'t___ (mustn't, can't) have
gone too far. His coffee is still warm.
(浙江2016)
6. I _n_e_e_d_n_'_t_ (needn't, couldn't) have
2. No reader __s_h_a_ll___ remove a book from the library without the permission of the librarian.
can shall may should need
3. The girl ___ca_n____ not be Mary — she's in New York.
3. “情态动词+ have done”结构 1) could / might / should / ought to / need
have done意为“本来能/可能/应该/需 要做……，但实际上未做……”。如： He could have escaped, but he chose to stand and fight. It was an easy test and he should have passed, but he didn't.
高中英语-情态动词 课件(共34张PPT)艺体班
• Must的奇葩用法 "偏偏，非得要” • You must play the piano at such a late time? • Why must school begin so early?
四、 shall, should
1) shall 用于第一\三人称疑问句，征求对方的意见。（will用于第 二人称疑问句，征求对方的意见。）
need *否定句及疑问句中;
(sb.) need to do
dare
dare to do
3.常以needn’t 的形式出现;
和daren’t(sth.)
need
to
be
4.dare有其过去时dared.
done
(sth.) need doing
• need 的被动含义：need，want, require, worth (adj.)后面接doing 也可表示被动
• （1）表示许可；
• （2）用于祈使句，表示祝愿，翻译为“祝……”
•
May you succeed!
• （3）把握不太大的推测（只能用在肯定句，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.
• 固定结构： • 1.may well 有充足的的理由可以-• You may well be proud of him. • 2.may/might as well 还是…为好 • There’s nothing to do, so I may/might/ as well go to bed. • 既然没什么事可做,我还是去睡觉为好. • 3.might as well have done 还不如--（还可用于指过去的
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
高中英语情态动词课件.ppt
light has been turned off.
must
2. 表示“坚持”（常用于固定句型：if you must do sth. 如果你非得要做某事）
如果你真的要走，那就悄悄离开。
If you must leave, do it quietly.
• 3.must 做必须讲时，其疑问句的否定回答 用needn't，表示不必，mustn't表示不准 ，禁止。
sБайду номын сангаасconds ago.
A.may
B.might C.must
must
1. must 表示肯定的猜测，译为“一定”， 只能用于肯定句,在疑问句和否定句中表 推测时分别要用can/could和 can't/couldn't。
This must be your pen. He must be doing his homework now. He can't be in the classroom, for the
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
can/could:
2.在疑问句中，用could可表示请 求，语气较委婉。
He asks if he c_o_u_l_d smoke here. — C_o_u_ld_I have the television on?
must
2. 表示“坚持”（常用于固定句型：if you must do sth. 如果你非得要做某事）
如果你真的要走，那就悄悄离开。
If you must leave, do it quietly.
• 3.must 做必须讲时，其疑问句的否定回答 用needn't，表示不必，mustn't表示不准 ，禁止。
sБайду номын сангаасconds ago.
A.may
B.might C.must
must
1. must 表示肯定的猜测，译为“一定”， 只能用于肯定句,在疑问句和否定句中表 推测时分别要用can/could和 can't/couldn't。
This must be your pen. He must be doing his homework now. He can't be in the classroom, for the
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
can/could:
2.在疑问句中，用could可表示请 求，语气较委婉。
He asks if he c_o_u_l_d smoke here. — C_o_u_ld_I have the television on?
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.
2021/10/10
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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.
2021/10/10
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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
高中英语情态动词优秀课件
Shall 1 用于第一人称，表示建议或征求对方的意见。 Shall we meet there at 6?
2 用于第二、三人称陈述句中，强调说话人的用意，表示说话人给对方的命令，警 告，允诺或威胁等。
You shall be punished for what you’ve done.
3 用在条约，规定，法令等正式文件中表示义务，命令或规定，一般为第三人称，意 为“应，必须〞。
3 表很有把握的逻辑推测。〔疑问句、否认句中用can’t〕 You must be tired after your long walk.
4 (why ) must you…? 用于当某人的行为打搅了你，常意为“〔为什么〕你非要… 〞
Why must you always smoke in the office?
All payments shall be made in cash.
4 用于第一人称，表示意图，决心。 I shall never do that again.
Should/ought to 意为“应该，按道理说〞 1 表示义务，命令，劝告，建议等，两者可通用。
2 表示推测，期望。 It should be a nice day tomorrow.
4) Nobody knows how people first came to these islands. They ____ from South America on rafts.
A) must have sailed B) can sail C) might have sailed D) should have sailed 5) Mary was not in her bedroom yesterday afternoon. She ____ in her classroom. A) should have been B) must have been C) must be D) should be
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couldn’t be a doctor.
B. could可以代替can表示请求、“允许
”。可表示委婉客气的提出问题或陈述
看法
Could you lend me your dictionary? Could I use your bike? Yes, you can. I’m afraid I couldn’t give you an answer today.
意愿“要；愿”
Would 与 Used to do 区别 ——— “过去常常”
Would
------过去习惯的动作（现在有可能还有此习惯）
Used to do
--------过去习惯的动作及状态（现在已经没有此习惯）
e.g. He would get up at 8 a.m. (现在有可能还在坚持此习惯) e.g. He used to get up at 8 a.m. （现在已经不再坚持此习惯）
动作
e.g. There used to be an old building
here when I was young.
状态
shall和should：
1. shall用于构成将来时是助动词。 shall用于征求对方的意见，表示 “决心” 是情态动词。 eg: Perhaps I shall pay a visit to England this winter. 可能今年冬天我会去英国观光。 （构成一般将来时, 助动词）
3)表示请求或允许(和may意思相近)常见于 口语。 Can (May) I come in ? 我能进来吗? Can I smoke here ? 我可以在这里抽烟吗?
2) could的主要用法是： A. could 是can的过去式, 表示与过去 有关的能力和推测:
eg. We all knew that the young man
must和 have to
1.must用于一般问句中,肯定回答用must 否定式用 needn’t或don’t have to， 做 “不必”,mustn’t表示“禁止，不允 许” — Must I finish all assignments at a time? —Yes, you must.
Would表示有礼貌的请求或邀请（2人称） Would you help us, please? 请您帮助我们，好吗？ When I had some trouble, he would encourage me. 过去的习惯 We all tried to atop him smoking in bed but he wouldn’t listen.
表示现在的许可, 语气比may 较委婉, 一般用于疑问句(包括间接疑问句), 不可 用于肯定句或者否定句。 如: Might I have a word with you? 我可以和你说句话吗？
You may well be right There is nothing to do, so I may as well go to bed. The film is so boring, and we might as well not have come to see it. May well 很可能、有充分的理由可以 May/might as well最好，不妨 Might as well have done 还不如 May ...do/be... 祝愿
Shall we go by train, Mom?
妈妈，我们乘火车去好吗？
（用于征求对方的意见，情态动词）
I shall go at once. 我必须立即去。 （表 “决心”，情态动词）
1)用于第一、 三人称征求对方的意见， What shall I wear on the journey? Shall we dance? 2)shall 用于第二、三人称时表允诺，警告， 命令，威胁。“必须，应该可以” If he passes the examination, he shall have a holiday. You shall have it back tomorrow.
If you give him time,Tom will talk and talk for hours. 经常性习惯性“老是、总是、终归是 Every Saturday evening they will play chess together 表示功能，译作“能” The door won’t open 或“行” I’ll do my best to help you. 意愿 Will you please give me a message when you see him? 2人称，询问对方意愿或向对方 提出请求 ---Write to me when you get home. ---I will 回答祈使句
to treat (治疗) this kind of disease(疾病).
Can表示一贯的能力 ，be able to表示客观能 力和通过努力可以达到的能力 1. I can’t swim. But I am sure I will be able to swim through more practicing. 2. The fire spread through the hotel, but everyone was able to get out 3. When the boat sank he was able to swim to the bank
No, you needn't.
2.表示“必须”这个意思时，must 和 have to 稍有区别。must着重说明主观 看法，have to 强调客观需要。另外， have to 能用于更多时态。
I don’t like this TV set. We must buy a new one. There was no more bus. They had to walk home.
You can’t be too careful She couldn’t but agree to my idea. The girl couldn’t help crying. I can’t thank you enough. The film couldn’t be any worse. I burst out laughing; I couldn’t help it Can或could 的否定形式构成习惯短语 Can’t...too... Can’t ....enough...无论怎样。。。也不过 分。。。 Can’t(help)but do不得不做，只好做 Can’t help doing 情不自禁 Can’t help it 没有办法 Can’t ...+比较级 再。。。不过了（表示最高级）
Grammar
情态动词的语法特征
1） 情态动词 不能单独做谓语，除 ought 和have 外，后面只能接不带to 的 不定式。 2） 情态动词没有人称，数的变化，但有些 情态动词，如can、will也有一般式和过去 式的变化。 3） 情态动词的“时态”形式并不是时间区 别的主要标志，不少情况下，情态动词的现 在式形式和过去式形式都可用来表示现在时 间、过去时间和将来时间。
当回答由may 引起的问题时，否定答语要用 must not,表示“不许可”、“不应该”、“不 行”。 May I come in? Yes, you may. No,you can’t No, you may not . No ,you mustn’t No ,you’d better not.
--But I may be wrong.
ห้องสมุดไป่ตู้
The guest may arrive this afternoon.
在疑问句中，表示可能性用can。 如：Where can he be? 他会在 哪呢？
C. 表示祝愿;但语气较正式: eg. May you succeed! May you have a good journey! might 的用法有: 多在间接引语中表示过去的可能和允许。 如: She said that he might take her bike. 她说他可以拿她的自行车去用
3）用于第二、三人称用于法律法规条例等 文件中的要求。“应该、必须” It’s required in our regulation that students shall go to school on time. Persons under 18 shan’t be employed in night work.
Can 与 be able to do 的区别
时态： can 只有现在时和过去(could),
be able to do 有多种时态。
（在将来时，完成时以及非谓语动词中应该用 be able to do.） e.g. So far, doctors have been able to do very little
will和would：
1. will是助动词或是情态动词？ will用于构成将来时是助动词。用于 表示“意志”“决心”“请求”是情态 动词。would亦同理。 eg. I will tell you something important. 我要告诉你一些重要的事。 （助动词）
Will you tell her that I'm here? 请您告诉她说我在这儿，好吗？ （情态动词）
may 和might ： may 常用来表示： A. 表示请求、允许;比can较为正式 May I come in ? You may go now.(给予许可） B. 表示说话人的猜测: “也许” “可 能”: 通常只用于肯定句和否定句中。
eg. --I believe the man is from England.
B. could可以代替can表示请求、“允许
”。可表示委婉客气的提出问题或陈述
看法
Could you lend me your dictionary? Could I use your bike? Yes, you can. I’m afraid I couldn’t give you an answer today.
意愿“要；愿”
Would 与 Used to do 区别 ——— “过去常常”
Would
------过去习惯的动作（现在有可能还有此习惯）
Used to do
--------过去习惯的动作及状态（现在已经没有此习惯）
e.g. He would get up at 8 a.m. (现在有可能还在坚持此习惯) e.g. He used to get up at 8 a.m. （现在已经不再坚持此习惯）
动作
e.g. There used to be an old building
here when I was young.
状态
shall和should：
1. shall用于构成将来时是助动词。 shall用于征求对方的意见，表示 “决心” 是情态动词。 eg: Perhaps I shall pay a visit to England this winter. 可能今年冬天我会去英国观光。 （构成一般将来时, 助动词）
3)表示请求或允许(和may意思相近)常见于 口语。 Can (May) I come in ? 我能进来吗? Can I smoke here ? 我可以在这里抽烟吗?
2) could的主要用法是： A. could 是can的过去式, 表示与过去 有关的能力和推测:
eg. We all knew that the young man
must和 have to
1.must用于一般问句中,肯定回答用must 否定式用 needn’t或don’t have to， 做 “不必”,mustn’t表示“禁止，不允 许” — Must I finish all assignments at a time? —Yes, you must.
Would表示有礼貌的请求或邀请（2人称） Would you help us, please? 请您帮助我们，好吗？ When I had some trouble, he would encourage me. 过去的习惯 We all tried to atop him smoking in bed but he wouldn’t listen.
表示现在的许可, 语气比may 较委婉, 一般用于疑问句(包括间接疑问句), 不可 用于肯定句或者否定句。 如: Might I have a word with you? 我可以和你说句话吗？
You may well be right There is nothing to do, so I may as well go to bed. The film is so boring, and we might as well not have come to see it. May well 很可能、有充分的理由可以 May/might as well最好，不妨 Might as well have done 还不如 May ...do/be... 祝愿
Shall we go by train, Mom?
妈妈，我们乘火车去好吗？
（用于征求对方的意见，情态动词）
I shall go at once. 我必须立即去。 （表 “决心”，情态动词）
1)用于第一、 三人称征求对方的意见， What shall I wear on the journey? Shall we dance? 2)shall 用于第二、三人称时表允诺，警告， 命令，威胁。“必须，应该可以” If he passes the examination, he shall have a holiday. You shall have it back tomorrow.
If you give him time,Tom will talk and talk for hours. 经常性习惯性“老是、总是、终归是 Every Saturday evening they will play chess together 表示功能，译作“能” The door won’t open 或“行” I’ll do my best to help you. 意愿 Will you please give me a message when you see him? 2人称，询问对方意愿或向对方 提出请求 ---Write to me when you get home. ---I will 回答祈使句
to treat (治疗) this kind of disease(疾病).
Can表示一贯的能力 ，be able to表示客观能 力和通过努力可以达到的能力 1. I can’t swim. But I am sure I will be able to swim through more practicing. 2. The fire spread through the hotel, but everyone was able to get out 3. When the boat sank he was able to swim to the bank
No, you needn't.
2.表示“必须”这个意思时，must 和 have to 稍有区别。must着重说明主观 看法，have to 强调客观需要。另外， have to 能用于更多时态。
I don’t like this TV set. We must buy a new one. There was no more bus. They had to walk home.
You can’t be too careful She couldn’t but agree to my idea. The girl couldn’t help crying. I can’t thank you enough. The film couldn’t be any worse. I burst out laughing; I couldn’t help it Can或could 的否定形式构成习惯短语 Can’t...too... Can’t ....enough...无论怎样。。。也不过 分。。。 Can’t(help)but do不得不做，只好做 Can’t help doing 情不自禁 Can’t help it 没有办法 Can’t ...+比较级 再。。。不过了（表示最高级）
Grammar
情态动词的语法特征
1） 情态动词 不能单独做谓语，除 ought 和have 外，后面只能接不带to 的 不定式。 2） 情态动词没有人称，数的变化，但有些 情态动词，如can、will也有一般式和过去 式的变化。 3） 情态动词的“时态”形式并不是时间区 别的主要标志，不少情况下，情态动词的现 在式形式和过去式形式都可用来表示现在时 间、过去时间和将来时间。
当回答由may 引起的问题时，否定答语要用 must not,表示“不许可”、“不应该”、“不 行”。 May I come in? Yes, you may. No,you can’t No, you may not . No ,you mustn’t No ,you’d better not.
--But I may be wrong.
ห้องสมุดไป่ตู้
The guest may arrive this afternoon.
在疑问句中，表示可能性用can。 如：Where can he be? 他会在 哪呢？
C. 表示祝愿;但语气较正式: eg. May you succeed! May you have a good journey! might 的用法有: 多在间接引语中表示过去的可能和允许。 如: She said that he might take her bike. 她说他可以拿她的自行车去用
3）用于第二、三人称用于法律法规条例等 文件中的要求。“应该、必须” It’s required in our regulation that students shall go to school on time. Persons under 18 shan’t be employed in night work.
Can 与 be able to do 的区别
时态： can 只有现在时和过去(could),
be able to do 有多种时态。
（在将来时，完成时以及非谓语动词中应该用 be able to do.） e.g. So far, doctors have been able to do very little
will和would：
1. will是助动词或是情态动词？ will用于构成将来时是助动词。用于 表示“意志”“决心”“请求”是情态 动词。would亦同理。 eg. I will tell you something important. 我要告诉你一些重要的事。 （助动词）
Will you tell her that I'm here? 请您告诉她说我在这儿，好吗？ （情态动词）
may 和might ： may 常用来表示： A. 表示请求、允许;比can较为正式 May I come in ? You may go now.(给予许可） B. 表示说话人的猜测: “也许” “可 能”: 通常只用于肯定句和否定句中。
eg. --I believe the man is from England.