内容正文:
情 态 动 词
Unit 8 People and Events
If I have seen further,it is by standing on the shoulders of giants.
如果我比别人看得更远,那是因为我站在巨人的肩膀上。
Review Aims
1.通过回顾情态动词的种类和含义,把情态动词进行分类,培养学生分析和归纳总结能力。
2.通过复习背诵常见的情态动词含义及用法,能在具体题目中准确应用,培养学生语境分析能力。
3.通过背诵情态动词的含义,能够根据给出的话题与同桌进行对话,培养学生语言交际能力
常见的情态动词:can、could、may、might、must、should、have to
否定形式:can not=can’t、
should not=shouldn’t、
must not=mustn’t
Review by yourself 1
Review by yourself 2
画出下列句子中的情态动词
1.I believe you can finish the task on schedule.
2.Could you please help me with this.
3.You might be right.
4.We mustn’t waste any time.
5.We should learn from the best.
精讲点拨
1. can, could 能,能够
(1)表示能力(体力、知识、技能)。could表示过去的能力。
Can you lift this heavy box?
你能把这个重的盒子搬起来吗?
When he was young, he could sing very well.
在小时候,他就能唱得很好了。
(2)表示请求或允许,此时可与 may 互换。
常用于“Can/Could I/you...?”句型中。
could 不表示过去,而是表示委婉的请求,但答语只能用 can。
—Could you help me work out the
problem?你能帮我做出这道题吗?
—Yes,I can. 是的,可以。
—Can Igo now?我现在能走吗?
—Yes,you can./No, you can't. 可以走。/不能走。
(3)表示推测,意为“可能”,常用于否定句和疑问句中。否定语气较强时,用 can’t,译为“不可能”。而 may not,译为“可能不,也许不”,语气较弱。
Can this be true?这是真的吗?
This can't be done by him.这不可能是他干的。
2. may, might 可以,可能
(1)表示请求和允许。might 比 may 语气更委婉,而不是其过去式。否定回答时可用can't 或 mustn't,表示“不可以,禁止”。用May I...?征询对方许可时比较正式和客气,而用Can I...?在口语中更常见。
-May I smoke here?我可以在这里吸烟吗?
—No,you mustn't/can’t. 不,不行。
(2)表示推测、可能性(不用于疑问句)。
might 的可能性一般比 may 要小些。
He may /might be very busy now.
他现在可能很忙。
(3)用于祈使句,表示祝愿,形式 :May十主语十动词原形。
May you succeed! 祝你成功!
3.shall,should
(1)shall 用于第一人称,征求对方的意见,表示“(你)要我(们)做⋯吗?”
Shall I open the window for you?
我可以为你打开窗户吗?
Shall we go for a walk?
我们可以散个步吗?
(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。
You shall fail if you don't work hard.
如果你不努力工作,你就会失败。
4. will, would
(1)表示征求意见或提出请求,多用于第二人称作主语的疑问句中。would 的语气比较委婉。
Will you close the window? It's very cold.
请你把窗户关上好吗?太冷了。
(2)表示意志、愿望和决心。
Mary said she would do everything for him.
玛丽说她愿意为他做任何事情。
5. must, have to
(1)must 表示推测时,指有根据、有把握的推测,只能用于肯定句。可以对现在、过去或将来的情况进行推测。
You must be a middle school student.你一定是一名中学生。
(2)must 的否定形式 mustn't意为“禁止,不许”,不能用来表示推测。
表示有把握的否定推测时用can’t,意为“不可能”。
You mustn't park your car on this street.不许把车停在这条街道上。
(3)由 must 引导的一般疑问句,肯定回答用
“Yes,... must ”,否定回答用“No,...needn't/don't have to"
-Must we hand in our exercise books today?
我们必须今天上交我们的练习本吗?
—Yes, you must. /-No, you don't have to / needn't.
是的,必须交。/不,不必交。
6. need
(1)need 作情态动词用时,意为“需要;有必要”,主要用于疑问句、否定句,没有人称和数的变化。有need 构成的一般疑问句其肯定回答用 must。
—Need I finish the work today?我需要完成这项工作吗?
—Yes, you must. /No, you needn't.
你必须。/不,你不必。
(2) need 作实义动词用时,有人称、时态数的变化。其后既可接动词(用不定式或动名词,但不能用原形),也可接名词或代词等。
但用动名词时总是用主动形式表示被动意义。
The windows need to be washed. = The windows need washing. 这些窗户需要擦洗了。
情态动词 词义 否定形式 词义
can /could 能够,可能 cann't /couldn't 不能,不可能
may / might 可以,或许 mayn't / mightn't 可能不
must 必须 mustn’t 禁止,不允许
have to 不得不 don’t have to 不必
shall 将,要 shan't 将不
should/ought to 应该 shouldn’t/oughtn't to 不应该
will/would 将;将/愿意 won't/wouldn’t 将不;将不/不愿
need 需要 needn't 不必
dare 敢 daren't 不敢
maybe和may be的区别
1. maybe(副词)放句首/句末,表“也许”,
例:Maybe he is late.
2. may be(情态动词+动词)放句中,表“可能是”,
例:He may be late.
小tips:maybe=perhaps,may be可拆成may+be 换位置验证
1. ______ she will come tomorrow.(Maybe/May be)
2. She ______ at home now.(Maybe/May be)
3. ______ it is not a good idea.(Maybe/May be)
解析:
1.Maybe (副词放句首,表也许)
2. may be (情态动词+be放句中,表可能是)
3. Maybe (副词放句首,表也许)
当堂检测
1.Cars,buses and bikes stop when the traffic lights change to red.
A.can B.may
C.must D.need
2.—Mr. Li,may I go home now?
—No,you .You should sweep the floor first.
A.can't B.must
C.needn't D.can
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3.Mary be at home. I saw her in the library just now.
A.mustn't B. needn't
C.shouldn't D.can't
4.—What a nice day! we go surfing?
—Good idea.
A. Shall B.Must
C.Need D.Will
5.We keep the new traffic law and learn how to protect ourselves.
A.may B. should
C.can D.need
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6.— you like some more tea,sir?
—No,thanks.
A. Would B.May
C.Must D. Shall
7.Please don’t make so much noise. I hear the speaker very well.
A.can’t B.needn’t
C.mustn’t D.shouldn’t
8.According to the traffic rules in our country,you wear your seat belt when driving.
A.may B.can
C.would D.should
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9.—Must I finish the task today?
—No,you . You can do it tomorrow.
A.needn’tB.can’tC.shouldn’tD.mustn’t
10.—Is that girl in red Lucy?
—No,she be Lucy. She has gone to Hainan with her grandparents.
A.can B.must
C.mustn’t D.can’t
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11.—Must I get ready at seven o’clock tomorrow?
—No,you .
A.mustn’t B.needn’t C.do not D.don’t have
12.—Let’s go there by taxi.
—It’s not far. We take a taxi.
A.needn’t B.can’t
C.mustn’t D.couldn’t
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13.—Whose volleyball is this?
—It be Bob’s. He never plays volleyball. He dislikes it.
A.can’t B.may not
C.must D.can
14.—Could you give me a few minutes?
— I have to leave immediately.
A.Yes,I could. B.Yes,I can.
C.Sorry,I can’t. D.Sorry,I couldn’t.
15.You play in the street. It’s too dangerous.
A.need B.needn’t C.must D.mustn’t
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16.— I download the article again?
—No, you needn't.
A. Shall B. Will C. Must D. Can
17.—Can you go skating with us this afternoon?
—Sorry, I can’t. I take care of my little sister at home.
A. can B. may C. would D. have to
18.—Must I hand in my exercise book today?
—No, you __.
A. can’t B. needn’t C. mustn’t D. won’t
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19.—May I have a word with you?
—No, you . I’m busy today.
A. needn’t B. wouldn’t C. don’t have to D. can’t
20.— I have your English name, please?
—Yes,Helen. H-E-L-E-N.
A. May B. Must C. Will D. Need
21.—Can you play frisbee,Jay?
—Yes,I . It's easy.
A. must B. can C. need D. may
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22.She know the answer, but I’m not sure.
A. maybe B. may be C. may D. must
23.John come to see us tonight, but he isn’t very sure yet.
A. must B. can C. has to D. may
24.Children play with fire.
A. mustn’t B. can’t C. shouldn’t D. needn’t
25.—Must I finish the work today?
—No,you . You finish it tomorrow.
A. mustn’t;may B. can’t;can
C. needn’t;may D. needn’t;must
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26.It’s so easy. You it on the paper.
A.need write B.don’t need write C.don’t need to write D.needn’t to write
27.Speak loudly , or I hear you.
A.may not B.shouldn’t C.needn’t D.can’t
28.— you like some coffee?
—No,thanks.
A.May B.Must C.Shall D.Would
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29.I will help you,so you worry about it.
A.don’t need B.needn’t to C.not need D.needn’t
30.We sort the waste to recycle.
A.need B.should C.can D.may
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Thanks for attention!
Modal Verbs
If I have seen further,it is by standing on the shoulders of giants.
如果我比别人看得更远,那是因为我站在巨人的肩膀上。
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