高中情态动词课件大全

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

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
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?
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。
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.
1. You shall fail if you don’t work hard.(警告) 2. He shall have the book when I finish it.(允诺) 3. He shall be punished.(威胁)
六、 will, would
1) 表示请求、建议等，would更委婉。 Will / Would you pass me the ball, please? 2) 表示意志、愿望和决心。 1. I will never do that again. 2. They asked him if he would go abroad.

— Might I watch TV after supper? — Yes, you ________. A. may B. must C. might D. could
.
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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
.
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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
.
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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”

3. may的用法
(1) 表示请求、许可， 比can 正式， 如：
May I borrow your bike? 我可以借你的自行车吗？ You may go home now. 现在你可以回家了。 (2) 表示推测，谈论可能性，意为“ 可能， 或许”，一般用 于肯定句中。 如： It may rain tomorrow . 明天可能会下雨。 She may be at home. 她可能在家呢. (3) may的过去式为might ，表示推测时。可能性低于 may 。 如： He is away from school. He might be sick. 他离开学校了， 可能是他生病了。
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。
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
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。