学习如何在英语中使用情态动词（请求权限和表示能力的情态动词）

Modal Verbs 情态动词

Modal VerbDefinition 情态动词的定义

Modalverbs are a small class of auxiliary verbs used to express possibility, obligation, advice, permission, ability, … 情态动词是用来表达possibility, obligation, advice, permission, ability等

Modal Verb Examples 情态动词的例子

Will 将；总是；愿意；（表示能力、容量等）能；惯于；可能；必须Shall 应；会；将；必须Would 将，将会（will 的过去式）；会，就；想；请；愿意；也许；老是；要是；表原来的目的Should 应该；就；可能；将要Ought to 应该Must 必须；一定；应该，得Mustn’t 不能May 可以，能够；可能，也许；祝，愿；会，能Might 可能，也许，可以（may 的过去式）Can 能；懂得；可以；有机会，有可能；难道会；必须；把……装罐保存；解雇；拒绝接受；看到，听到；不相信……是真的Could 能够， 可以；可能；差点就，本来有可能；很想Have to/ Has to 必须；不得不；只好Don’t/ Doesn’t have to 不需要

情态动词must, may, might, could, can表示推测：

以must为例。must + do(be)是推测现在存在的一般状态进行；must + be doing 推测可能正在进行的事情；must +have done是推测可能已经发生过的事情。

1. must“肯定，一定”语气强，只用于肯定句中。

He must be a man from America. / He must be talking with his friend. / He must have already arrived there.

2. may和might“也许”，后者语气弱，更没有把握。可用于肯定句和否定句。

He may not be at home. / They might have finished their task.

3. can和could“可能”，could表示可疑的可能性，不及can’t语气强，用于肯定、否定、疑问句中。

The weather in that city could be cold now.

We could have walked there; it was so near.（推测某事本来可能发生，但实际上没有发生）

Can he be in the office now? No, he can’t be there, for I saw him in the library just now.(语气很强，常用于疑问句和否定句中)

情态动词注意点：

1. can和be able to: 都可以表示能力。但be able to可以表达“某事终于成功”，而can无法表达此意。Be able to有更多的时态。另外，两者不能重叠使用。

2. used to和would: used to表示过去常常做现在已经不再有的习惯，而would只表示过去的习惯或喜好，不涉及现在。

3. need和dare作情态动词和实义动词的区别：

两者作情态动词时常用于否定句和疑问句。其形式为：needn’t/daren’t do；Need/dare…do…?

做实义动词时可用于肯定句，否定句和疑问句。其形式为：need(needs/needed)/dare(dares/dared) to do, don’t(doesn’t/didn’t) need/dare to do

Modal Verb Examples 情态动词的例子

Modal Verbs To Express Ability 表示能力的情态动词

Learn how to use Modals of Ability in English 学习如何在英语中使用情态动词

Be able to 能够Can/Can’tCould/Couldn’tManaged to 设法

Modals of Ability Image 能力图像的模态

Modals for Asking Permissions 用于请求权限的情态动词

Learn useful Modals for Asking Permissions in English 学习英语中询问权限的有用情态动词

CanCouldMayWould

Modals for Asking Permissions Image 用于请求权限图像的模态

Perfect Infinitive with Modals 带情态动词的不定式

The structure “have + past participle” is called a perfect infinitive. have +过去分词的结构被称为完全不定式。

Learn how to use perfect infinitive with modal verbs in English: must have, can’t have, should have, shouldn’t have, needn’t have, ought to have, may have, might have, could have, would have. 学习如何将完成式不定式与情态动词连用:must have, can "t have, should have, shouldn "t have, needn "t have, needn "t have, ought to have, may have, might have, could have, would have。

Perfect Infinitive with Modals Image 带情态动词图像的完美不定式