不能 vs 不会 (bù néng vs bú huì): 'can't' for circumstances vs skill
Though both 不能 and 不会 mean 'cannot' or 'can't', they differ in the reason behind the inability. 不能 (bù néng) expresses that something is not allowed or is impossible due to external circumstances (e.g., rules, schedule), while 不会 (bú huì) indicates a lack of learned skill or a strong negative prediction (it won't happen). For example, use 不会 when you don't know how to swim, but 不能 when you are not allowed to swim.
The core difference is the source of the inability: 不能 points to external factors (prohibition, objective impossibility, or circumstantial obstacles), while 不会 points to internal factors (lack of learned skill or a negative future prediction). In terms of grammar, both are followed by a verb, but the negation pattern differs: 不能 uses 'bù néng' (不 stays 4th tone before 2nd tone), and 不会 uses 'bú huì' (不 changes to 2nd tone before 4th tone). A useful mental shortcut: if you could learn to do it, use 不会; if it's out of your control or forbidden, use 不能.
When to use each
Use 不能 when something is not allowed by rules or authority, or when circumstances prevent it (e.g., you are too busy, the weather is bad, a physical limitation that is not a learned skill). It often corresponds to 'must not' or 'be unable to due to external conditions'. Examples: 你不能在这里吸烟 (you can't smoke here – prohibition), 我今天不能来 (I can't come today – schedule conflict).
Use 不会 to express that you have not learned a skill (lack of knowledge or training), or to make a strong negative prediction about a future event (it won't happen). It corresponds to 'doesn't know how to' or 'probably won't'. Examples: 我不会开车 (I can't drive – I never learned), 明天不会下雨 (it won't rain tomorrow – prediction).
Note: '不会' can also be used to politely decline an offer (e.g., '我不会喝太多' – I won't drink too much), but this overlaps with intentional choice; still, the core is 'won't' as a future negative.
At a glance
| 不能 | 不会 | |
|---|---|---|
| 核心含义 (Core meaning) | 外因/禁止 (external/prohibition) | 内因/技能 (internal/skill) |
| 常见场景 (Common scenarios) | 规则、客观限制 | 技能不足、未来否定预测 |
| 英文对应 (English equivalent) | cannot (not allowed) | cannot (don't know how / won't) |
| 例句 (Example) | 不能在这里抽烟 | 不会抽烟 |
Examples
- 不能我不能去聚会，因为要加班。Wǒ bù néng qù jùhuì, yīnwèi yào jiābān.I can't go to the party because I have to work overtime.external reason (work) prevents going
- 不会我不会弹钢琴。Wǒ bú huì tán gāngqín.I can't play the piano.lack of learned skill
- 不能这里不能停车。Zhèlǐ bù néng tíngchē.You can't park here.prohibition by rule
- 不会他不会来参加比赛。Tā bú huì lái cānjiā bǐsài.He won't come to the competition.negative future prediction
- 不能我不会游泳，所以不能去深水区。Wǒ bú huì yóuyǒng, suǒyǐ bù néng qù shēnshuǐ qū.I can't swim, so I can't go to the deep end.shows both: skill gap (不会) leads to circumstantial impossibility (不能)
Common mistakes
- Using 不能 for a lack of learned ability: '我不能说中文' to mean 'I can't speak Chinese' (should be 我不会说中文).
- Using 不会 for prohibition: '在这里不会吸烟' to mean 'You can't smoke here' (should be 不能在这里吸烟).
- Using 不能 for a strong negative prediction about weather: '明天不能下雨' to mean 'It won't rain tomorrow' (should be 明天不会下雨).
- Overgeneralizing 不能 to cover all 'cannot' meanings, ignoring the skill/prediction distinction.
FAQ
- When do I use 不能 vs 不会?
- Use 不能 when something is not allowed or impossible due to external circumstances (rules, schedule, physical obstruction). Use 不会 when you lack a learned skill or when you want to say something won't happen in the future. If you could learn to do it (like speaking a language), it's 不会; if it's forbidden or physically impossible (like being too late), it's 不能.
- Can 不能 and 不会 be used interchangeably?
- No, they are not interchangeable except in very rare, ambiguous contexts. They convey different reasons for inability. Using the wrong one can change the meaning from 'I don't know how' to 'I'm not allowed', leading to confusion.
- How do I say 'I can't speak Chinese'? Should I use 不能 or 不会?
- Use 不会 (我不会说中文) because speaking a language is a learned skill. Use 不能 only if you mean you are not allowed to speak it in a particular situation (e.g., 考试的时候不能说中文 – You can't speak Chinese during the exam).
- Is 不会 only used for skills, or also for permission?
- 不会 is primarily for skills and future predictions. It is not used for permission or prohibition; for that, use 不能 or 可以 (affirmative). For example, 'You can't enter' is 不能进去, not 不会进去.