情态动词是指本身有一定词义，用来表示语气的词语。情态动词用在行为动词之前，表示说话者对这一行为或状态的看法和主观感受。情态动词虽然数量不多，但用途广泛，今天厚朴少年学堂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.) If we don't hurry, we could be late. (= Maybe we will be late.)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.
4：Requests,offers and invitations请求,提议,邀请
Requests
我们使用could you .../would you ...来礼貌地告知、请求别人做某事：Could you take a message, please? Would you carry this for me, please?同样可使用can/will请求别人做某事，但礼貌程度略有降低：
Can you take a message, please? Will you take a message, please?
offers and invitations
我们使用can I... /shall I...来进行提议：Can I help you? Shall I help you with that?有时也用I can/I could/I will来提议：
I can do that for you if you like. I could give you a lift to the station. I'll do that for you if you like. I'll give you a lift to the station.我们使用Would you like (to)...表示邀请：
Would you like to come round tomorrow? Would you like another drink?
5：Suggestions and obligations建议和义务
Suggestions
我们使用should/could/shouldn't来给建议You should send an email. We could meet at the weekend. You shouldn't go by train.注意！could一般用在给出积极建议的时候。
obligations
我们使用must/mustn't/have to表达义务、必须做/不做某事：（have to严格来讲不算情态动词哦，但用法接近情态动词，所以可以一起学习）You must stop at a red light. I'm sorry, but you mustn't make a noise in here. You have to go to the meeting.注意！当在给出命令或强烈建议时通常使用must；在说到规则规定的时候通常使用have to。 如果涉及过去的话，则使用had to/couldn't表示义务：
Everyone had to bring some food to the meeting. You couldn't make a noise in the library.
That's it! 这就是情态动词的基本用法啦！一些情态动词如can/could, must, may在这此出镜率超高，小朋友们需要重点学习记忆~
最后的最后还要强调一点：
情态动词后接动词原形！
情态动词后接动词原形！
情态动词后接动词原形！
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