Grammar · 语法 yǔfǎ

会 / 能 / 可以

huì · néng · kěyǐ

Three modal verbs that all translate as "can" — but 会 asks did you learn it?, 能 asks are you capable right now?, and 可以 asks are you allowed?

字源 zìyuán Etymology — Three Words, Three Different Origins
字源洞见 zìyuán dòngjiàn · Etymological Insight

会 huì originally means "to assemble, to gather, to come together" — the oracle-bone form shows a lid on a vessel, things being brought together and contained. This sense of "convergence" extends to meeting (会议 conference), opportunity (机会 chance), and understanding (领会 to grasp). The path to "learned ability" runs through this: when things come together in a person through practice, they acquire a skill. 我会游泳 — the knowledge of swimming has gathered in me through training.

能 néng is a pictograph of a bear — specifically the North American black bear (熊, in its older form). Bears are among the most capable and powerful animals: strong, intelligent, adaptable. The character encodes raw, intrinsic power and capacity. This is why 能 covers physical capability, functional capacity, and circumstantial ability — it is about what your nature or current situation allows, not what you have learned.

可以 kěyǐ is a compound: 可 kě (acceptable, may, can — a person's mouth opening, suggesting voiced assent) + 以 yǐ (to use, by means of, in accordance with). Together: "acceptable to use; permissible by means of [rules/norms]." The original sense of 可 as assent makes 可以 fundamentally about social permission — someone or some rule has opened the gate.

These three etymological personalities persist in the grammar: 会 is the studious one (what have you learned?), 能 is the capable one (what can your body/situation do?), 可以 is the social one (what do the rules allow?). The three dimensions — learned skill, physical capacity, social permission — are genuinely distinct, which is why all three modals have survived rather than merging.

核心结构 héxīn jiégòu Core Pattern — One Position, Three Meanings
能愿动词 néngyuàn dòngcí · Modal Verb Position Subject + 会 + Verb → 我会说中文 — learned ability (I learned Chinese)
Subject + 能 + Verb → 我能去 — physical/circumstantial ability (I'm able to go)
Subject + 可以 + Verb → 你可以进来 — permission (you may come in)
All three take negation with 不 before the modal: 不会 · 不能 · 不可以
学者洞见 xuézhě dòngjiàn · The Core Contrast in One Sentence

The same person, same skill, three different frames:

我会游泳 Wǒ huì yóuyǒng — I can swim. (I learned how. I have this skill in my repertoire.)

我能游泳 Wǒ néng yóuyǒng — I can swim. (I am physically capable of swimming right now. My arm isn't broken, the pool is open, circumstances permit.)

我可以游泳吗？ Wǒ kěyǐ yóuyǒng ma? — May I swim? (Is it allowed? Is this pool open to the public? Is there a rule against it?)

In practice, 能 and 可以 overlap in permission contexts — both can mean "may I." But 会 never overlaps with the other two on the permission dimension. 会 is exclusively about acquired skill and future likelihood.

会：习得技能 huì: xídé jìnéng 会 — Learned Ability
会说中文 huì shuō Zhōngwén can speak Chinese — learned through study and practice
会 + V (learned skill)
会 indicates that a skill was acquired through learning, training, or practice. The speaker once did not have this ability and now does — through effort. This is the fundamental meaning: know how to. Skills that fall under 会 are typically those a person could conceivably study or be taught: languages, instruments, sports, cooking techniques, driving.
你会开车吗？——会，我学了半年。
Nǐ huì kāichē ma? — Huì, wǒ xué le bàn nián.
Can you drive? — Yes, I've been studying for half a year.
她会弹钢琴，还会拉小提琴。
Tā huì tán gāngqín, hái huì lā xiǎotíqín.
She can play piano and can also play violin.
我不会做饭，但想学。
Wǒ bù huì zuòfàn, dàn xiǎng xué.
I can't cook, but I want to learn.
语法 yǔfǎ · 不会 as "don't know how" 不会 is the standard way to say you don't know how to do something: 我不会 (I can't / I don't know how). In response to an offer of help: 你会吗？不会 (Can you? No, I can't). 不会 can also soften a refusal politely — 这个我不太会 "I'm not really very good at this."
会：将来预测 huì: jiānglái yùcè 会 — Future Prediction and Likelihood
明天会下雨 míngtiān huì xià yǔ it will rain tomorrow — 会 as future/likelihood marker
会 + V (prediction)
会 has a second major function entirely distinct from learned ability: expressing expectation, likelihood, or prediction about a future event. This 会 does not mean "has learned how to" — rain cannot "learn" to rain. Instead, it signals the speaker's confident expectation that something will occur. This is essentially a future/predictive modal.
他会来的，你放心吧。
Tā huì lái de, nǐ fàngxīn ba.
He'll come, don't worry.
这不会是真的吧？
Zhè bù huì shì zhēn de ba?
This can't be real, can it? (expressing disbelief)
别担心，一切都会好起来的。
Bié dānxīn, yīqiè dōu huì hǎo qǐlai de.
Don't worry, everything will get better.
辨析 biànxī · 会 vs. 要 in future contexts Both 会 and 要 can indicate future events, but with different flavors. 要 suggests something is imminent or intended (明天要下雨 = "it's going to rain soon, it's about to"). 会 suggests confident expectation or likelihood (明天会下雨 = "it will rain, I expect"). 要 is more urgent; 会 is more measured.
能：能力与情境 néng: nénglì yǔ qíngjìng 能 — Physical and Circumstantial Ability
头疼，不能去 tóuténg, bù néng qù headache, can't go — circumstance prevents ability
能 (circumstantial)
能 covers physical capacity (your body can or cannot do something) and circumstantial ability (the situation allows or does not allow). When you say 不能去, you are not saying you don't know how to go somewhere — you are saying current conditions prevent it: illness, conflicting schedule, physical barrier. The bear character is apt: the bear's capacity is contingent on its condition and situation.
我头疼，今天不能去上课了。
Wǒ tóuténg, jīntiān bù néng qù shàngkè le.
I have a headache; I can't go to class today.
这个箱子我一个人能搬吗？——能，试试看。
Zhège xiāngzi wǒ yī gè rén néng bān ma? — Néng, shì shi kàn.
Can I carry this suitcase by myself? — Yes, give it a try.
医生说他暂时不能喝酒。
Yīshēng shuō tā zànshí bù néng hējiǔ.
The doctor said he can't drink alcohol for the time being.
这间屋子能容纳五十个人。
Zhè jiān wūzi néng róngnà wǔshí gè rén.
This room can hold fifty people.
语法 yǔfǎ · 能 with quantities and capacities 能 is the natural choice when expressing a container or functional capacity: 这台电脑能存多少数据？ "How much data can this computer store?" The emphasis is on what the system or body is capable of, not on learned skill or permission.
可以：许可 kěyǐ: xǔkě 可以 — Permission and Social Sanction
可以进来吗？ kěyǐ jìnlái ma? May I come in? — requesting permission
可以 (permission)
可以 is the canonical permission modal. It asks or grants social authorization — whether rules, norms, context, or a person in authority allows an action. The asker knows they have the physical ability; the question is whether they have the social right. This is the modal you reach for when entering an office, asking to take a photo, requesting to leave, checking rules.
这里可以拍照吗？
Zhèlǐ kěyǐ pāizhào ma?
Is photography allowed here?
你可以走了。
Nǐ kěyǐ zǒu le.
You may leave now. (granting permission)
这里不可以抽烟。
Zhèlǐ bù kěyǐ chōuyān.
Smoking is not allowed here.
老师，我可以去洗手间吗？
Lǎoshī, wǒ kěyǐ qù xǐshǒujiān ma?
Teacher, may I go to the restroom?
辨析 biànxī · 不可以 vs. 不能 in prohibition Both 不可以 and 不能 can express prohibition, but with different emphasis. 不可以 = you are not permitted (rule-based). 不能 = you are not able to / must not (the circumstance or condition does not allow it). In practice the distinction is soft — both work in most prohibition contexts. But signs and official notices tend toward 不可以 or 禁止 (forbidden), while personal constraints use 不能.
交叉与细微差别 jiāochā yǔ xìwēi chābié Overlaps and Nuances
能 vs. 可以 in permission néng vs. kěyǐ both can express "may I" — register and emphasis differ
overlap zone
In permission contexts, 能 and 可以 are largely interchangeable in colloquial speech. 能不能… and 可不可以… are both natural ways to make requests. The subtle distinction: 可以 is slightly more formal and social (it foregrounds the permission-granting authority), while 能 is slightly more casual and focused on practical possibility. When in doubt in a permission context, 可以 is the safer, more polite choice.
你能帮我一下吗？ / 你可以帮我一下吗？
Nǐ néng bāng wǒ yīxià ma? / Nǐ kěyǐ bāng wǒ yīxià ma?
Can you help me? (Both natural; 可以 slightly more polite)
你能不能小声一点？/ 你可以小声一点吗？
Nǐ néng bu néng xiǎo shēng yīdiǎn? / Nǐ kěyǐ xiǎo shēng yīdiǎn ma?
Could you be a bit quieter? (Both common; 能不能 is slightly more direct)
会 vs. 能 for skills huì vs. néng for skills the same skill, different framing
overlap zone
When asking about skills, 会 is the baseline question (do you know how?). 能 asks whether current conditions allow you to exercise that skill. 你会游泳吗 asks if you learned swimming. 你现在能游泳吗 asks whether you can swim right now (implying there might be a reason you couldn't — injury, no pool, no swimsuit). In practice, both are used loosely and context usually disambiguates.
他会说英语，但今天嗓子哑了，说不出来。
Tā huì shuō Yīngyǔ, dàn jīntiān sǎngzi yǎ le, shuō bu chūlai.
He can speak English (knows how), but today his voice is hoarse and he can't speak.
规律 guīlǜ · The iron rule 会 NEVER means "is permitted to." 不会 NEVER means "is not allowed to." If the question is about permission or prohibition, 会/不会 is wrong — use 可以/不可以 or 能/不能. This is the one firm boundary: 会 stays in the domain of learned ability and future expectation only.
对比表 duìbǐ biǎo 会 / 能 / 可以 — Complete Comparison
Modal Core meaning Affirmative Negative Question
会 huì Learned skill; future expectation 我会 wǒ huì (I know how) 不会 bù huì (don't know how) 会不会 / 会吗
能 néng Physical/functional capacity; circumstances allow 我能 wǒ néng (I am able) 不能 bù néng (can't / mustn't) 能不能 / 能吗
可以 kěyǐ Permission; social sanction 可以 kěyǐ (it's OK / permitted) 不可以 bù kěyǐ (not allowed) 可以吗 / 可不可以
— (overlap) 能 ≈ 可以 in permission (colloquial) 你能来吗 ≈ 你可以来吗 — both natural in casual speech
成语 chéngyǔ Ability in Idioms
无能为力 wú néng wéi lì powerless; unable to do anything about it Lit: have-no-ability-to-act-with-force. 无能 = lacking ability; 为力 = to exert effort/force. The standard idiom for expressing helplessness in the face of a problem. 对于这件事，我也无能为力 "I am also powerless over this matter." Formal and literary; widely used.
各有所能 gè yǒu suǒ néng each has their own abilities — everyone has something they're good at Lit: each-has-what-[they]-can[do]. A Confucian-flavored observation about the distribution of talent. Used to affirm that different people excel in different domains — a polite and diplomatic formula. 人各有所能，没什么好比较的 "Everyone has their own abilities; there's nothing to compare."
才能出众 cáinéng chūzhòng outstandingly talented — ability that stands above the crowd 才能 cáinéng (talent and ability) + 出众 chūzhòng (to stand out from the crowd). 能 here combines with 才 (talent, capacity) to form the compound 才能. Used in recommendations, eulogies, and formal praise. 她才能出众，前途无量 "Her talents are exceptional; her future is limitless."
能屈能伸 néng qū néng shēn able to bend and able to stretch — flexible and adaptable Lit: can-yield-can-extend. Describes someone who knows when to be humble and when to assert themselves — a virtue prized in Chinese social thought. 大丈夫能屈能伸 "A real man of character can yield and can rise again." 屈 = to yield, bow; 伸 = to stretch out, extend.
相邻词汇 xiānglín cíhuì Adjacent Vocabulary — Ability and Permission
应该yīnggāishould, ought to 必须bìxūmust, have to 要yàowant to; will; must 想xiǎngwant to, feel like 愿意yuànyìwilling to 敢gǎndare to 禁止jìnzhǐforbidden, prohibited 允许yǔnxǔto permit, allow 许可xǔkěpermission (formal noun) 才能cáinéngtalent, ability (noun) 能力nénglìcapability, capacity (noun) 本领běnlǐngskill, ability (colloquial)