2迈4.11克.202一0 定还没有找回他的车, 因为早上他是
18
坐公共汽车来上班的。
need & dare (dared)
情态动词 ： （无单三形式）
need/dare do sth need/dare not do sth 实意动词： need/dare to do sth don’t/doesn’t/didn’t dare to do sth
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2 Some aspects of a pilot’s job_____ be
boring, and pilots often _____ work at inconvenient hours. （2006 湖南） A. can；have to B. may；can
C. have to; may
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4.shall和should
shall 用法 1. shall表征求意见，用于一三人称 疑问句中
Shall we go by train, Mom? Shall he attend the meeting? 2.用于二 三人称 的陈述句中，表威胁警告命令允诺等语 气 You shall get a present when I came back. You shall be punished if you break the rules.
Wuhan.
2. At this moment, our teacher ___m__u_s_t_b__e_m__a_r_k_ing
our exam papers.
这时, 我们老师想必在批改试卷。
3. The road is wet. It _m__u_s_t_h__a_v_e__r_a_in__edlast night.
eg. Can I sit here?
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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:
We all knew that the young man couldn’t be a doctor. B. could可以代替can表示请求, 但语气较can客气、 委婉:
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1.Being afraid of making mistakes ,he ____ answer his teacher's question
A. doesn't dare B. doesn't dare to
C. daren't to
D. not dare to
2.Having failed the exam. The little boy __go home and face his mom.
4. may as well=had better do
(最好做某事）
You’d better take notes carefully. You may as well take notes carefully.
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3.will和would
will是助动词还是情态动词？ will用于构成将来时是助动词。 eg. I will tell you something important. 我要告诉你一件重要的事情。
(rain)
4. Your mother __m_u__s_t_h_a_v_e__b_e_e_n__l_o_o_k_i_nfgor you.
你妈妈一定一直在找你。
5. 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.
7. These pills might help to cure your disease.
8. You could be right, I suppose.
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Practice 2: Fill in the blanks.
1. I don’t know where she is, she __m__a_y__ be in
对现在
对过去
+ V.
+ have done
+ be doing
可能的推测
may, might
否定的推测
can’t, couldn’t
疑问的推测
can, could 24.11.2020
+ Biblioteka .+ V.+ have done
+ be doing
可以用not表示“可能不”
+V.
+ V.
+ have done
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1 Children under 12 years of age in that
country ____ be under adult
supervision when in a public library.
(2004 上海）
A. must
B. may
C. can
D. need
情态动词：1.表意愿或意志 I will never do it again. If you will marry me, whatever I have is yours, and mines is yours.
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2.提出 请求或建议 ,在疑问句中用于第二人称。
eg: If you want help, let me know, will you? Will you type this, please?
weekends.
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would & used to (过去常常，习惯于） would 现在有可能做，也有可能不做 used to 现在一定没有做 There used to be a big tree. I would go to the library when I was free. I _u_s_e_d_t_o_ to cry when I was a child.
高一英语英语必修3Unit1语法情态动词课件
什么是情态动词？ (Modal Verbs)
情态动词表示说话人的某种 感情或语气，对某一动作 或状态的某种态度。 表示“需要、可以、can/could, 必须、应当”等。 may/might,
must/ have to, shall/should (ought to), will/would need, dare/dared
You mustn't play with fire.
You mustn't take drugs.
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2. 表“偏要”“偏偏”，违背说话人意愿。 Must you talk in class? ---How much do you earn? ---I’ll tell you if you must know it.
7. 针对过去---- should have done
8. To my surprise, he should be a thief.
9. He should have lied to me yesterday.
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5.must的主要用法
1. 必须。must表主观“必须”
have to 表客观“不得不”
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• 情态动词的特点： 1.情态动词自身都有一定的意义， 但不能表示正在发生或已经发生的 事情，只表示期待或估计某事发生。 2.情态动词除ought和have外，后 面必须接不带to的不定式。 3.情态动词没有人称和数的变化, 也没有非谓语形式。
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1. can和could
★could 提问，答语用can ---Could I borrow your pen? ---yes, you can.
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2.may和might
may 常用来表示： 1. 在正式文体中表示请求、允许（比can正式）：:
eg. May I come in ?
You may go now. 2. 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。
2. He must have finished his homework, hasn’t he? 3. It must have rained yesterday, didn’t it?
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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
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should 用法
1. 应该=ought to
2. You should study hard.
3. 2. 表万一，多位于句首。
4. Should he come, I would let you know.
5. 3. “居然”，“竟然”,表说话人意料之外。
6. 针对现在---- + V原
1. can的主要用法是： A. 表能力
eg. The girl can dance very well. be able to 通过努力做成某事
He was able to reach Mount Qomolangma in 2000. B. 表示说话者的推测﹑事物的可能性:(否、疑）
eg. Can the news be true? C. 在口语中, can可以表示请求或允许：