RWYQ阿伟 | 2022-10-20 | 未命名 | 0条留言 | 1195 | 2022-10-20更新
情态动词
（1）can、could表示能力，用be able to 代替 can、could 现在、过去的能力。
客观可能性，can的可能性更大。
表示请求和允许。
1.He can/could/is able to swim.
2.He can/could come tomorrow.
3.Can/Could I stay here?
（2）may/might表示可能性，may的可能性大
请求，允许，might更委婉
口语中常用的回答：
-Yes， please。
-No， you can’t/mustn’t.
1.He may/might come here by bus.
2.-May/Might I join you?
-Yes, please. / No, you can’t. / No, you mustn’t
1.She (could) speak French before, but now she (can’t).
2.-(Might) I come in?
-Yes, please.
（3）must/have to 表示必须、必要。must表示主观多一些，have to 表示客观多一点
have to有时态和数量的变化。
must和have to两者的否定意义不相同。
mustn’t-禁止
don’t have to-不必
1.You must get up early.
2.It’s going to rain, I have to go home now.
（4）should表示劝告、建议、命令、同义词ought to。should强调主观看法，而ought to强调客观要求。
在疑问句中，通常用should代替ought to
1.You should/ought to do the job right now.
2.Should they stay here now?
1.I (must/have to) go and see my mother in hospital tomorrow.
2.You (should) work harder than that.
（5）need：需要
情态动词
实义动词，有单三形式和时态变化，后面可加带to不定式
情态动词：
1.He need come here early.
2.He needn’t come here early.
3.-Need he come here early?
-Yes, he need. / No, he needn’t.
实义动词：
1.He needs to come here early.
2.He doesn’t need to come here early.
3.-Does he need to come here early?
-Yes, he does. / No, he doesn’t.
（6）回答must和have to 的提问句时候，否定形式使用needn’t,don’t have to等回答方式。
1.-Must I come here early tomorrow?
-No, you needn’t / don’t have to.
1.You (needn’t) do it again.你不需要重复做了。
2.He (needn’t) worry about it.这件事他无需担心
3.(Does) he need to do homework first?他需要先做作业吗？
（7）had better 表示“最好做某事”，had虽然是过去式，但不表征过去，better后接动词原形。
1.He had better eat more.
2.You’d better finish it right now.
（8）would rather表示宁愿，宁可，最好，还是……为好，语感上比had better要轻。
1.You would rather deal with it now.
（9）否定形式
had better not + 动词原形
would rather not + 动词原形
1.He had better not eat more.
2.You would rather not deal with it now.
1.You (had better) stay here.你最好待在这里。
2.I (would rather) not say it.我还是不说的好。
（10）used to, would表示过去习惯性动作，翻译为过去常常……
a.used to 可指过去的状态或情况，would则不能。
1.The novel used to be popular.
b.would表示反复发生的动作。如果某一动作没有反复性，只能使用used to
1.He would practise English every week.
2.I used to live in Beijing.
c.used to 表示过去经常性习惯性动作或状态现在已经结束，would则表示有可能在发生。
1.People used to believe that the earth was flat.
2.He would go to the park as soon as he was free.
1.The window (used to) be open.
2.They (would) gather together every week.
3.Sam (used to) play golf, but he doesn’t now.
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标题：【wiki】英语语法_入门_崔荣容
作者：RWYQ阿伟
浏览：1195
发布：2022-10-20
更新：2022-10-20
分类：未命名
标签： 英语