高一英语英语必修3Unit1语法情态动词课件

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:
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.
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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
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。
Unit 1
Modal Verbs
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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
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。
The guest may arrive this afternoon.
---Can he attend the meeting?
---Yes, he_m__a_y. I am not sure.
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3. 表示祝愿,位于句首 eg. May you succeed! May you have a good journey!
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”
★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.
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?
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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
★祈使句问句与答语一般用will Open the door, will you? --- Please come to my party. --- Yes, I will
3. 表习惯或必然结果 Fish will die without water. I will go to see my former classmates on
I must go home this Saturday. I’ve got a cold, so I have to see a doctor.
---Must I stay here?
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：
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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.