剑桥MSE基础语法丨情态动词的作用（上）
-
-
梁老师 北京小升初老师～
0 人点赞了该文章 · 81 浏览
情态动词虽然数量不多，但用途广泛，今天王老师就带大家一起来从情态动词的作用着手，一起拿下情态动词吧！
情态动词的作用：
Probability可能性
Ability能力
Permission准许
Requests, offers and invitations请求，提议，邀请
Suggestions and obligations建议和义务
1.Probability可能性
情态动词可用来表达可能性，我们将可能性分为三个程度：不可能，可能，一定。
可能
我们使用may/might/could表达可能，但不确定：
They may come by car. (= Maybe they will come by car.)
They might be at home. (= Maybe they are at home.)
我们使用can来概括表达可能的事：
It can be very cold here in winter. (= It is sometimes very cold here in winter.)
You can easily get lost in this town. (= People often get lost in this town.)
那么，同样是表达可能，can和may/might/could有什么区别呢？
感受一下这两个例句就会知道啦：
That dog can be dangerous.(= 这只狗有时候会很凶，讲话者很确定这一点。)
That dog may/might/could be dangerous.(= 这只狗可能会很凶，讲话者不确定这一点。)
注意！我们不使用can来谈论具体的事件。
A: Where's John?
B: I'm not sure. He may/might/could be (NOT can) in his office.
不可能
我们使用can't/cannot表达绝不可能：
That can't be true.
You cannot be serious.
一定
我们使用must表示非常确信的事，并且，一般会有理由支撑：
It's getting dark. It must be quite late.
You haven't eaten all day. You must be hungry.
我们使用should来表示某些事是真的，并且有理由这么认为：
Ask Miranda. She should know.
It's nearly six o'clock. They should arrive soon.
must更为强硬+确定。
2：Ability能力
我们使用can/can't表达有无某项技能、能力：
She can speak several languages.
They can't dance very well.
或在现在或将来能否做到某事：
I can see you.
Help! I can't breathe.
如果要表达过去能够做到某事，则使用could：
She could speak several languages.
I couldn't see you.
3：Permission准许
Asking for permission
我们使用can/could/may来请求允许：
Can I ask a question, please?
Could I ask a question, please?
May I ask a question, please?
could/may更加正式、有礼貌。
Giving permission
我们使用can/may来给予准许：
You can go home now.
You may go home now.
同样，may更加正式、有礼貌。
我们还使用can表达某人得到了允许去做某事：
Students can go outside after lunch.
Refusing permission
我们使用can't和may not来拒绝请求：
You can't go home now.
Students may not go outside after lunch.
静态动词作用内容较多，明天将继续分享后两个内容：Requests, offers and invitations请求，提议，邀请、Suggestions and obligations建议和义务 。明天见~
添加 家长论坛微信
全部 0条评论