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Unit 2

Modal Verb II

? can/could 能,会,可以(表推测,能力, 请求,许可) ? 区别:can /be able to may/might 可能(表推测) 祝愿(表祝愿,祝福) 可以(请求,许可) shall/should 应该 一、三(表建议、征 求对方意见) 二、三(表命令、强制、允诺) 竟然(表惊讶)

must (1)一定,必须 (表推测)(2) 偏偏,偏要 (表感情色彩) 否定:mustn't 不准,禁止 must提问,肯回用must,否定回needn't/don't have to 区别:must/have to will/would 将会(表意愿,允诺)经常,常常 (表过去习惯性的动作) 区别:would/used to

Fill in the blanks according to the Chinese. 我认为她应该向公众道歉。 to apologise I think she ought _______ to the public. ought to go and You ________ see the doctor. 你应当去找医生看看病。

泰坦尼克号应该是部好电影。 should be a good movie. Titanic ______

We know if we keep at it should succeed. we _______ 我们知道如果我们坚持 下去就应该会成功。

冬天的时候,我们不得不 穿上温暖的衣服。 We ______ have to put on warm clothes in winter.

You _______ have to mix the flour and the butter.


In England traffic _____ must keep to the left. 在英国,车辆必须 靠左行驶。

All passengers ______ must wear seat belts. 所有乘客都必须系安全带。

ought to/should should 和ought to 都为“应该”的意思, 可用于各种人称。ought to 的语气稍重 一些。 You ought to (should) follow your teacher’s advice.


You should take care of your sister.

They shouldn't allow parking here; the street is too narrow. 这儿不该允许停车;马路太窄了。

should 和ought to 后面跟动词不定式的 完成式, 其肯定句表示”过去应该做而 未做”, 其否定句则表示”过去不该做 但做了”。 You should/ought to have made the decision a week ago. I shouldn't have made such a foolish mistake.

must / have to must的用法 1. 表示主观的义务和必要, 主要用于肯 定句和疑问句, 意思为 “必须……, 得……,要……”;由must 引起的疑问 句,肯定回答要用must或have to, 否定回 答要用needn’t或don’t have to, 意思是 “不必” ; must的否定形式mustn’t表 示

禁止,意思是“不能, 不许”。如:
—Must I finish the task right now?

—Yes, you must. / Yes, you have to. 是的。 (—No, you needn’t. / No, you don’t have to. 不, 不必。)

have to 的用法 1. must表示一种主观的需要,而have to 表示一种客观的需要,意思是 “不得不”。 如: I have to attend an important meeting this afternoon. 今天下午我不得不参加一个重要的会议。

Mother is out, so I have to look after

the shop. 妈妈不在家,因此我不得不照看商店。 2. have to 的否定形式是don’t have to, 相当于needn’t。如: They don’t have to buy a computer at present. 他们目前没有必要买电脑。

need / dare
情态动词 (+动词原形) 行为动词

1.无人称和数的变化; need 2.尤其用于: *否定句及疑问句中; . *在if/whether之后; *或与hardly, never, no one, nobody连用; dare 3.常以needn’t 和daren’t 的形式出现; 4.dare有其过去时dared.

(sb.) need to do dare to do need to be done need doing

注意对need问句的回答: --Need I finish the work today?

you must --Yes, ________________. you needn’t No, ________________. you don’t have to No, ________________.
needn’t 对其它情态动词的回答: --Shall I tell John about it? --Must we do it now? --No, you __________. needn’t --No, you __________. needn’t

--No, you don’t __________. have to

--No, you don’t __________. have to

dare表示“敢”,作情态动词(疑, 否,if/whether之后) 作实义动词,后可加to do,也可省略。 e.g:1.How dare you say that?(情态动词) 2.She doesn't dare (to) ask her father.(实义 v) 3. Dare you go home alone? -Yes, I dare. -No, I dare not.

Nobody need to be afraid of catching the disease. Nobody need be afraid of catching the disease. These dishes need be cleaned carefully. These dishes need to be cleaned carefully. These dishes need cleaning carefully.

How dare you say such a thing? How dare you to say such a thing? He daren’t to speak English before such a crowd, did he? He daren’t speak English before such a crowd, dare he?

? would rather do sth.(than do sth.) ? would do sth. rather than do sth. ? would rather sb. did sth. prefer to do sth. prefer to do sth. rather than do sth. prefer doing sth. to doing

情态动词 对将来 肯定的 推测 must 对现在 对过去

+ V. 常见 + V./+ be + have done must be doing

可能的 + V./+ be + have + + V. doing 推测 done may/might 可以用not表示“可能不”

情态动词 对将来 对现在

对过去 + have done

否定的 推测 can’t/ couldn’t
疑问的 推测 can/could


+ V./+ be doing

+ V.

+ V./+ be doing

+ have done

在不表示推测的情态动词中, 我们要注 意以下方面的问题: 1. 表示能力、许可的情态动词的用法。 2. 表示否定的情态动词的用法。 3. shall 和 will 的多种意义的区别。 4. 情态动词短语的使用。 5. 虚拟语气中情态动词的使用。

1. 表示能力、许可的情态动词的用法。 表示能力: can, could, be able to be able to 能用于各种时态。 can / could 只能表示现在或过去的能力。

was / were able to 设法做成某事
相当于 managed to do sth. succeeded in doing sth.

表示许可: may / might, can / could

might, could 比较委婉, 一般多用于疑 问句。 can, may 表达的语言比较随便。 在以could, might 表示征询对方意见 或表示请求时,回答应相应使用can, may。

2. 表示否定的情态动词的用法:
部分情态动词的否定式是情态动词中的 考点之一。 mustn’t 不准; 禁止 needn’t 没必要 ( = don’t have to ) can’t 不能; 不可能 may not 不可以; 可能不 shouldn’t 不应该 ( = ought not to )

不同的“肯定”程度可按下列层次排列: He is at home. (事实) He must be at home.(非常肯定的推断) He could be at home.(很可能) He ought to be at home.(很可能) He may be at home.(仅仅可能而已) He might be at home.(或许, 非常不确定) He couldn’t be at home.(很可能不在家) He can’t be at home.(一定不在家) He isn't at home.(事实)

3. 情态动词shall, will 的多种意义:
shall / will+ 动词原形: 均可表示将来。 过去时为 should, would。

shall 可表示必须、命令、警告或征询意见。

will 可表示意愿、常出现的动作、在疑问 句中表示请求和建议。

4. 情态动词短语的使用: would like to do… would rather do… would rather + 从句 would prefer to do... had better do... 5. 用于虚拟语气的情态动词: should might could would needn’t ought to

1. I _____ D use a clock to wake me up because at six o’clock each morning the train comes by my house. (2012全国高 考 I) A. couldn’t B. mustn’t C. shouldn’t D. needn’t D 2. The new law states that people _____ drive after drinking alcohol. (2012上海 高考) A. wouldn't B. needn't C. won't D. mustn't

3. It’s quite warm here; we _____ C turn the heating on yet. (2012天津高考) A. couldn’t B. mustn’t C. needn’t D. wouldn’t B have bought so much food now 4. We _____ that Suzie won’t be with us for dinner. (2012江西高考) A. may not B. needn’t C. can’t D. mustn’t


做适当的运动 You should do some sports.

慢慢地进食, 并有助消化。 You ought to eat slowly and it’s good for digestion.

You should help to set the dinner table.

You should keep your room clean.

We must listen to the teacher carefully.

We mustn’t eat in class.

You ought to hand in the homework on time.

You shouldn’t be late for school.

We should ask question actively.

We shouldn’t make noise in class.

1. 你每天最少要练习一小时口语。 You must practise speaking English at least an hour a day.

2. 我每天不得不练习一小时口语!
I have to practise speaking English

an hour a day!

3. 你应该每天练习说英语不止一小时。 You ought to/should practice English for more than an hour. 4. 你应该读一下这个。它写得很好。 You ought to/should read this. It’s very good. 5. 你必须读这个。写得精彩极了! You must read this. It's marvelous!

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