Grammar Rule in 30 Seconds
Use 'can' plus a base verb to show what you are able to do right now.
- No 's' for he/she/it: 'He can swim', not 'He cans swim'.
- Never use 'to' after can: 'I can dance', not 'I can to dance'.
- Negative is 'cannot' or 'can't': 'They can't come today'.
Overview
can，用来表达“现在的能力”。can 是一个非常非常基础但又极其重要的词。它能帮助你描述“谁”或者“什么东西”现在能够做什么事情。比如，你说 I can speak English，意思就是“我（现在）会说英语”，这是一种你目前拥有的技能。所以，can 是进行基本交流的必备工具，让你能说清楚自己的本领和事情的可行性。can 的用法比你想象的要简单得多！我们可以一步一步来理解它。Can 是一个“情态助动词”（modal auxiliary verb）。“助动词”的意思是它需要帮助主要动词来构成句子。它的用法和普通动词很不一样，这对初学者来说反而是个好事，因为它更简单。can 永远不变形！ 无论主语是谁（I, you, he, she, it, we, they），can 都只写 can。这就省去了很多麻烦，你知道，很多英语动词在遇到第三人称单数（he, she, it）的时候，后面要加 -s，比如 he eats。但 can 就不用，永远是 he can，she can。can 的基本结构非常直接：主语 + can + 主要动词的“原形”。-s, -ed, -ing。而且，特别注意，也不能加 to！比如，你应该说 swim（游泳），而不是 swims, swimming, 或者 to swim。can 直接放在主要动词前面，表示这个动作是主语能够做到的。这种直接搭配是情态动词的特点。它不像 I want to swim 这样，want 这个动词后面需要加上 to 才能跟上 swim。Can 本身就起到了连接和表达能力的作用。can 就像一个“能力指示器”，它告诉我们后面的动作，主语是可以完成的。can 的几种基本句式——陈述句、否定句和疑问句——对于准确表达能力至关重要。因为 can 的结构非常固定，所以学起来会比较容易。主语 + can + 主要动词原形 + (宾语/补充说明)can 和动词原形搭配起来：I can speak a little Spanish. (我会说一点西班牙语。) |You can ride a bicycle. (你会骑自行车。) |He can cook Italian food. (他会做意大利菜。) |She can understand simple instructions. (她能听懂简单的指示。) |It can jump very high. (它能跳得很高。) |We can find the library easily. (我们能轻松找到图书馆。) |They can build amazing things. (他们能建造很棒的东西。) |My brother can run very fast.(我哥哥跑得很快。) — 这描述的是一种身体能力，他现在就具备这种能力。This camera can take good photos.(这台相机能拍出好照片。) — 这说明的是一个物品的功能性，相机本身具备这个能力。You can learn from your mistakes.(你可以从错误中学习。) — 这表达的是一种普遍的人生能力，人都有从经验中成长的能力。
can 后面加上 not。英语里有两种写法：cannot 和 can't。主语 + cannot / can't + 主要动词原形 + (宾语/补充说明)cannot：这个写法是连在一起的，比较正式，在书面语中更常见。can't：这是cannot的缩写形式，在口语和非正式的写作中用得非常非常多。两者意思完全一样。
I can't swim very well. (我游泳游得不太好。) |You can't hear me. (你听不到我。) |He can't reach the top shelf. (他够不到那个高架子。) |She can't drive a car yet. (她还不能开车。) |It can't fly. (它不会飞。) |We can't understand that sentence. (我们听不懂那句话。) |They can't come to the party. (他们来不了聚会。) |I can't remember his name right now.(我现在想不起来他的名字。) — 这表示一种暂时的记忆障碍，你现在没法回忆起来。My old laptop cannot run this demanding software.(我的旧笔记本跑不了这个要求很高的软件。) — 这说明技术上的限制，电脑没有足够的能力运行。Fish can't walk on land.(鱼不能在陆地上行走。) — 这是一个事实陈述，鱼本身就不具备这个能力。
can 放到句子的最前面，然后是主语，接着是动词原形。Can + 主语 + 主要动词原形 + (宾语/补充说明)?Can I help you? (我能帮你吗？) |Can you understand this? (你能明白这个吗？) |Can he play chess? (他会下棋吗？) |Can she speak French? (她会说法语吗？) |Can it work now? (它现在能用了吗？) |Can we finish this today? (我们今天能完成这个吗？) |Can they see us? (他们能看见我们吗？) |Can your dog understand commands?(你的狗能听懂指令吗？) — 询问的是动物的学习和认知能力。Can you lift this heavy box?(你能搬动这个很重的箱子吗？) — 询问的是身体力量或承受能力。Can I use your pen for a moment?(我能用一下你的笔吗？) — 这个例子虽然也带有一点“请求允许”的意思，但在A1阶段，也可以理解为“我有能力/有机会用一下你的笔吗？”。
Can 开头的问句，我们通常会用一个简短的回答，结构非常固定：重复主语和 can (或 can't)。Can you drive a car?(你会开车吗？)Yes, I can.(是的，我会。) — 确认了技能。Can your computer run two programs at once?(你的电脑能同时运行两个程序吗？)No, it can't.(不能。) — 表明了技术上的限制。
can 最主要、最核心的用法就是表达“现在的能力”。这包括了各种各样的情况：一个人或物现在具备的技能、体力、智力，或者因为当前的环境条件而具备的可能性。它能清晰地告诉你，某件事在现在这个时间点，或者作为一个普遍规律，是能够被完成的。can。这些是你知道怎么做的事情，是你擅长的事情。I can play the guitar.(我会弹吉他。) — 这说明你掌握了一项音乐技能，通过学习和练习获得的。My sister can speak three languages fluently.(我姐姐能流利地说三种语言。) — 这突出了她语言天赋，能够跨文化有效沟通。He can draw realistic portraits.(他能画出逼真的肖像。) — 这展示了他绘画的艺术技能，能够精确地复制视觉形象。
Can 也可以用来描述生物（人或动物）的身体或思维方面的能力。比如力量、耐力、感官能力、认知能力等等。Humans can adapt to many different climates.(人类能够适应很多不同的气候。) — 这是一个关于人类固有生物学能力的普遍观察，说明我们的适应性。My grandmother can still read small print without glasses.(我奶奶不戴眼镜还能看清小字。) — 这描述了她良好的视力，一种她目前拥有的身体能力。Elephants can remember things for a very long time.(大象能长时间记住事情。) — 这说明了大象强大的记忆力，是一种固有的心理能力。
can 本质上是表达内在能力，但在A1级别，它也延伸到了“因为当前情况允许，所以可以做某事”的用法。这时候，“能力”不仅仅是内在技能，也包括了外部条件的支持，使得某件事变得可能。I can meet you this afternoon because my schedule is clear.(我下午可以和你见面，因为我的日程是空的。) — 这句话的意思是“我能够和你见面”，是因为“我有空”这个当前的环境条件。机会的出现使得行动成为可能。We can take the bus; there's a stop right outside.(我们可以坐公交车，外面就有个站。) — 这里can表示坐公交车是一个可行的选项，因为“公交车就在那里，可以使用”。它的存在创造了选择的可能性。You can find fresh vegetables at the market on Saturdays.(周六你可以在市场找到新鲜蔬菜。) — 这意味着“市场周六开门营业”这个事实，创造了你“能够找到”新鲜蔬菜的条件和机会。
can 是你用来表达“某人或某物现在能够做什么”的首选词，无论是通过天生的技能、后天学习、身体状况，还是有利的外部条件。can 看起来很简单，但对于初学者来说，还是有一些常见的错误需要注意。了解这些错误以及它们产生的原因，能帮助你更准确、更自然地使用英语。can 后面加 to：- 错误 (WRONG):
I can to play tennis. - 正确 (RIGHT):
I can play tennis.
want (我想要), need (我需要), like (我喜欢) 这样的动词之后。这些动词后面跟另一个动词时，确实需要加 to，构成 to-infinitive，比如 I want to eat (我想吃), I need to study (我需要学习)。can 是一个情态动词。所有英语情态动词（包括 can, could, may, might, will, would, shall, should, must）都有一个非常重要的规则：它们后面直接跟主要动词的原形，绝对不能加 to。can 本身已经起到了连接和表达能力的作用，再加一个 to 就显得多余且语法错误了。cannot 分开了：- 错误 (WRONG):
I can not swim. - 正确 (RIGHT):
I cannot swim.或I can't swim.
cannot 是一个整体，写成一个单词。虽然口语中经常用缩写 can't，但书写时，尤其是在正式场合，写成 cannot 更规范。把 can 和 not 分开写成 can not 是不正确的用法。can 的位置错误：- 错误 (WRONG):
You can swim?(虽然有时语气可以表示疑问，但这不是标准的疑问句形式) - 正确 (RIGHT):
Can you swim?
can 这样的助动词，构成疑问句最标准、最清晰的方式就是把助动词提到主语前面。把 can 放在句末，虽然有时在非常口语化的情境下能被理解，但不是标准的A1语法。要习惯这种“助动词提前”的结构。can 和中文的“能”完全一样：can 主要侧重“能力”，虽然在某些语境下也引申出“可能性”和“允许”，但初学时，重点要放在“能力”上。- 例子： 看到
Can you help me?，中文里可能是“你能帮我吗？”（询问能力），也可能是“你可以帮我吗？”（请求允许）。在英语中，Can you help me?主要还是询问对方是否有能力（比如有时间、不忙）来提供帮助。如果想更明确地请求允许，有时会用May I help you?(我能帮你吗？) 或者Could you help me?(你能帮我一下吗？，更委婉)。
can 的核心是“我/你/他/她/它有这个能力去做”。Can 在表达能力方面非常有用，但有时它会和一些其他表达方式产生混淆。我们来对比一下。can vs. be able tobe able to 也是用来表达“能够”或“有能力做某事”。在表示现在能力时，can 和 be able to 的意思非常接近，而且 can 更常用，更简单。can | be able to |be 动词 + able + to + 动词原形。be 会根据主语和时态变化。 |I can swim. (我会游泳。) | I am able to swim. (我能够游泳。) |can (只能用 could) | I was able to swim. (我当时能游泳。) |I will be able to swim. (我将能游泳。) | I will be able to swim. (我将能游泳。) |- 对于A1阶段，你只需要记住：表达“现在的能力”，用
can就对了，这是最简单、最常用的！ be able to的形式会变化（am able to,is able to,are able to,was able to,will be able to等），比can复杂。而且，can没有过去式和将来式形式，这时候就需要用be able to了（比如I could swim when I was young，或者I will be able to swim next year）。
can vs. may (Permission)can 也可以用来请求允许，但它更偏向于询问“我是否有能力/机会做这件事”。而 may 则更正式、更直接地用于请求允许。can | may |Can I sit here? (我能坐在这里吗？ - 暗含“这里有空位吗？”) | May I sit here? (我能坐在这里吗？ - 更正式、更礼貌地请求允许) |You can sit here. (你可以坐在这里。) | You may sit here. (你可以坐在这里。 - 更正式) |Can I go to the restroom? 是完全可以被理解的。但如果你想显得更礼貌一些，可以记住 May I...? 这个句型。can 后面一定要跟动词吗？can 后面必须跟一个动词的原形。比如 I can swim.，swim 是动词。如果你想说“我能做到”，可以说 I can do it.，这里的 do 也是动词。can 有复数形式吗？can 是情态动词，它不会因为主语是单数还是复数而改变。无论是 I can, you can, he can, she can, it can, we can, they can，都永远是 can。can 和 could 有什么区别？could 是 can 的过去式。它主要用来：- 1表达过去的能力：
When I was young, I could run fast.(我年轻的时候，跑得很快。) - 2提出委婉的请求：
Could you please help me?(你能帮我一下吗？) - 3表达现在的可能性（比
can更不确定）：It could rain later.(待会儿可能会下雨。)
can 的用法，也就是表达“现在的能力”。could 的用法可以稍后再学。Can you help me? 我不知道是问我“能不能帮”还是“要不要帮”，我该怎么回答？Can you help me?，通常是想知道你是否有能力、是否有时间帮他。如果你能帮，就回答 Yes, I can. 或者 Sure, what's up? (当然，有什么事？)。如果你不能帮，就回答 Sorry, I can't. (抱歉，我不能。) 或者 Sorry, I'm busy. (抱歉，我忙着呢。)Can I help you?，这更偏向于“有什么可以帮您的吗？”——一种提供服务的意愿。这时候你就可以说你需要什么，比如 I want to buy a phone. (我想买个手机。)。Can you...? 主要还是问“你有没有能力做？” 这个核心意思，是最稳妥的。2. Negative Contractions
| Full Form | Contraction | Usage |
|---|---|---|
|
cannot
|
can't
|
Most common in speech
|
|
can not
|
n/a
|
Rare, used for emphasis
|
Conjugation of 'Can' (Present Ability)
| Subject | Modal Verb | Base Verb | Example |
|---|---|---|---|
|
I
|
can
|
swim
|
I can swim.
|
|
You
|
can
|
dance
|
You can dance.
|
|
He / She / It
|
can
|
sing
|
She can sing.
|
|
We
|
can
|
cook
|
We can cook.
|
|
They
|
can
|
run
|
They can run.
|
Meanings
The word 'can' is a modal verb used to express that someone has the physical power, knowledge, or skill to perform an action in the present.
Physical Ability
Having the physical strength or capacity to do something.
“She can run a marathon in under four hours.”
“He can lift heavy boxes easily.”
Learned Skill
Knowing how to do something because you studied or practiced it.
“Can you play the piano?”
“My brother can code in Python.”
General Possibility
Expressing that something is possible or allowed by circumstances.
“You can see the mountains from my window.”
“It can get very cold here in winter.”
Reference Table
| 类型 | 结构 | 例句 | 简答 |
|---|---|---|---|
|
肯定句
|
Subject + can + Base Verb
|
I can speak English.
|
不适用
|
|
否定句 (正式)
|
Subject + cannot + Base Verb
|
He cannot swim.
|
不适用
|
|
否定句 (非正式)
|
Subject + can't + Base Verb
|
We can't go.
|
不适用
|
|
疑问句
|
Can + Subject + Base Verb?
|
Can you help me?
|
Yes, I can. / No, I can't.
|
|
疑问句
|
Can + Subject + Base Verb?
|
Can she drive?
|
Yes, she can. / No, she can't.
|
正式程度
I wonder if you could possibly assist me? (Requesting assistance)
Can you help me, please? (Requesting assistance)
Can you give me a hand? (Requesting assistance)
Yo, can you help a bro out? (Requesting assistance)
理解“Can”（能力）
结构
- 肯定句 Subject + can + Base Verb
- 否定句 Subject + cannot / can't + Base Verb
- 疑问句 Can + Subject + Base Verb?
重点
- 没有“to” Never 'can to verb'
- 没有“-s” Never 'cans' for he/she/it
- 没有“do” For questions or negatives
用途
- 技能 I can play guitar.
- 身体能力 She can run fast.
- 心理能力 He can remember names.
“Can”（能力）与常见错误对比
使用“Can”表达能力：快速指南
你想表达一种能力或技能吗？
是肯定句吗？
是否定句吗？
是疑问句吗？
你能做什么？
技能
- • I can speak English.
- • She can draw.
- • We can play chess.
身体能力
- • He can run fast.
- • They can lift heavy boxes.
- • I can touch my toes.
感官能力
- • Can you see that?
- • I can hear the music.
- • She can smell dinner.
不能
- • I can't sing.
- • He cannot drive.
- • We can't find it.
按水平分级的例句
I can swim.
I am able to swim.
She can't cook.
She is not able to cook.
Can you help me?
Are you able to help me?
They can speak English.
They know how to speak English.
He can play the guitar very well.
He has the skill to play guitar.
We can't come to the party tonight.
It is not possible for us to come.
Can she drive a car?
Does she have the skill to drive?
You can find the keys in the drawer.
It is possible to find them there.
I can usually finish my work by 5 PM.
It is generally possible for me.
Can you tell me where the bank is?
Are you able to provide directions?
It can be quite expensive to live in London.
It is a general truth/possibility.
I can't believe he said that!
I find it impossible to believe.
The new engine can reach speeds of 200mph.
The engine has the capacity.
You can't have seen him; he's in New York.
It is logically impossible.
Can I just say how much I appreciate this?
Seeking permission to speak.
Learning a language can be a lifelong journey.
It has the potential to be.
One can hardly expect them to agree immediately.
It is not reasonable to expect.
The implications can be seen across the entire sector.
The effects are visible.
I can't help but feel we've missed something.
I am unable to avoid this feeling.
Can we not simply admit that we were wrong?
A rhetorical suggestion.
The sheer scale of the project can scarcely be imagined.
It is almost impossible to imagine.
Such behavior can, and often does, lead to dismissal.
It has the inherent potential.
Can it be that the legends are actually true?
A poetic or archaic inquiry.
The virus can remain dormant for several years.
Biological capacity.
容易混淆
Learners use 'can' for permission when 'may' is traditionally required.
Using 'can' for past abilities.
Learners wonder if they are different.
常见错误
I can to swim.
I can swim.
He cans play soccer.
He can play soccer.
I no can go.
I can't go.
Do you can help?
Can you help?
I can't to hear you.
I can't hear you.
She can sings.
She can sing.
I am can swim.
I can swim.
I will can go tomorrow.
I will be able to go tomorrow.
I have could do it.
I have been able to do it.
He can speaks English.
He can speak English.
It can't have been him, can it?
Correct as is, but learners often use 'couldn't' incorrectly here.
句型
I can ___.
Can you ___?
He/She can't ___ very well.
Where can I ___?
Real World Usage
I can speak three languages fluently.
Can you lift this weight?
Where can I buy a bus ticket?
I can't believe I just won the lottery!
The app can't open the file.
Can you chop the onions?
记住：没有“to”
Can是情态动词，它后面直接跟动词原形，不需要加“to”。一定要说I can swim，而不是I can to swim。这是初学者常犯的错误哦！
“Can”后面不加“-s”
can不会因为主语是“he”、“she”或“it”而改变形式。永远是he can、she can、it can，不能说cans。保持简单就好！He can play the piano.
缩写词“can't”最常用！
“Can”的礼貌用法
Can you pass the salt?
Smart Tips
Use 'can' to list your skills clearly and concisely.
Immediately delete the 'to'. Modal verbs are 'to-free' zones.
Start with 'Can you...' to sound helpful and friendly.
Use the contraction 'can't' instead of 'cannot' in 99% of conversations.
发音
The Weak 'Can'
In affirmative sentences, 'can' is usually unstressed and sounds like /kən/ (kun).
The Strong 'Can't'
In negative sentences, 'can't' is stressed and the vowel is longer /kænt/.
The Glottal Stop
In American English, the 't' in 'can't' is often not fully pronounced, replaced by a sharp stop in the throat.
Question Rise
Can you swim? ↗
Standard yes/no question intonation.
记住它
记忆技巧
C.A.N. = Capability Always Now.
视觉联想
Imagine a 'Can' of soda with a muscle arm growing out of it. The muscle represents the 'ability' or 'power' to do something.
Rhyme
With 'can' the verb is always bare, no 's' or 'to' should ever be there!
Story
Meet 'Can-do Ken.' Ken is a superhero. He can fly, he can jump, and he can speak every language. But Ken is simple—he never uses 'to' and he never adds an 's' to his name, even when his friend 'She' is with him.
Word Web
挑战
Look around your room. Find 5 things you can do with the objects you see (e.g., 'I can read this book', 'I can open this window').
文化笔记
Using 'can' for permission (e.g., 'Can I go?') is very common, though teachers might say 'May I go?' is more 'correct'.
In professional settings, 'can' is used to show confidence in one's skills.
Often use 'can't' with a very broad 'ah' sound /kɑːnt/.
From the Old English 'cunnan', meaning 'to know' or 'to have mental power'.
对话开场白
What is one thing you can do very well?
Can you speak any other languages?
What can people do for fun in your city?
Can you play any musical instruments?
日记主题
常见错误
Test Yourself
My little sister ___ read yet.
Find and fix the mistake:
He cans play the piano well.
Can不会为任何主语添加“-s”词尾。所有主语的正确形式都是can。Choose the correct sentence:
can的疑问句，你需要将主语和can倒装。在can后面不能加to，也不能使用do/does。Score: /3
练习题
8 exercisesWhich sentence is correct?
I ___ speak Chinese, but I want to learn it one day.
Find and fix the mistake:
Do you can help me with my homework?
piano / she / play / can / the / ?
Can they swim?
I ___ see the stars tonight.
My cat ___ jump very high.
___ I borrow your pen?
Score: /8
Practice Bank
12 exercisesI ___ see the stage from here.
My phone is broken; I ___ call anyone.
She can to swim very well.
Do you can speak French?
Choose the correct sentence:
Choose the correct sentence:
Translate into English: 'Ella no puede cocinar.'
Translate into English: '¿Puedes ayudarme?'
Arrange these words into a sentence:
Arrange these words into a question:
Match the subjects with the correct form:
Match the subjects with their negative 'can' form:
Score: /12
常见问题 (8)
Yes, they mean the same thing. `can't` is a contraction and is very common in speaking. `cannot` is more formal and is always written as one word.
Not directly. We usually use `be able to` for the future (e.g., 'I will be able to come'). However, for scheduled events, we sometimes use `can` (e.g., 'I can meet you tomorrow').
Because `can` is a modal verb. Modal verbs are special and never change their form, no matter who the subject is.
They are very similar. `can` is more general and covers physical ability, while `know how to` specifically refers to learned skills. 'I can breathe' (physical) vs 'I know how to drive' (skill).
It is almost always written as one word: `cannot`. You only see `can not` if the 'not' belongs to a different part of the sentence, which is very rare.
Yes! In modern English, 'Can I...?' is perfectly acceptable for permission, though 'May I...?' is more formal.
Focus on the vowel. In `can`, the vowel is short and weak. In `can't`, the vowel is stronger and longer. In American English, the 't' is often a 'stop' in the throat.
No. You cannot put two modal verbs together. Instead of 'will can', you must say `will be able to`.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Poder
English 'can' does not conjugate for person.
Pouvoir
French distinguishes between 'pouvoir' (possibility) and 'savoir' (learned skill).
Können
Word order: English keeps 'can' and the verb together.
~eru / ~rareru
Japanese uses a suffix; English uses a separate modal verb.
Yastati'a (يستطيع)
Arabic 'can' conjugates for gender and number.
Hui (会) / Neng (能)
Chinese has two different words depending on the type of ability.
Learning Path
Prerequisites
Continue With
相关视频
Related Grammar Rules
第一条件句：Unless = If Not
你有没有试过向朋友解释，你肯定会去参加他们的乔迁派对，但前提是你的老板不让你加班？你可以说，`I will come if I don't have...
零条件句：习惯与日常
Overview 有没有注意过，太阳一下山你的手机就自动切换成深色模式？或者你一点开 Netflix 大脑就立刻想吃零食？这就是 Zero Cond...
Can: 表达能力 (Can)
Overview 你会做后空翻吗？或者哪怕只是烤出个还凑合的酸种面包？不管怎样，你都会用到 `can`。这个小词在英语里简直就是终极超...
混合条件句：过去的行为，现在的结果 (Type 2)
### Overview 混合条件句（Mixed Conditionals）是英语语法中一种非常高级的表达方式，它能让你在不同时间维度之间建立假设性联...
Suppose & Supposing: '假如'游戏
### Overview 在英语语法中，`suppose` 和 `supposing` 充当着特殊的“条件连词”角色，它们邀请听者参与到一场“思想实验”中。虽...
