凡是 vs 但凡 (fánshì vs dànfán): universal rule vs hypothetical condition
凡是 (fánshì) states an absolute, objective rule that applies to every case without exception, while 但凡 (dànfán) introduces a hypothetical or minimal condition, often in literary contexts. The key difference is that 凡是 states a fact, whereas 但凡 sets a condition that may or may not be true.
Both 凡是 and 但凡 can translate to 'every', 'any', or 'whenever' in English, but they serve very different functions. 凡是 is used to state a universal truth or rule — it means 'all without exception' and is typically followed by 都 or 就 to express the result. 但凡, on the other hand, introduces a hypothetical or minimal condition, meaning 'as long as' or 'if only', and is more literary in tone. Understanding the distinction between stating a fact and implying a condition is crucial for correct usage.
When to use each
Use 凡是 to make a universal statement about a category of people or things, often with a rule or generalization. It is followed by 都 or 就 to indicate that the result applies to all members of the group. It is common in formal, written, or spoken Chinese when stating facts or regulations.
凡是 often appears in negative or prohibitive contexts with 不 or 没有, but the universal scope remains: e.g., 凡是不符合条件的人都不能参加. This is still a statement of rule, not a hypothesis.
Use 但凡 to introduce a hypothetical condition that, if satisfied, leads to a certain result. It often carries a sense of minimal requirement (e.g., 'if there is even a little...') or regret about an unfulfilled condition. It is primarily used in literary, formal, or rhetorical speech, not in everyday conversation.
但凡 is frequently used with 也, 都, or 就 in the result clause, and can imply that the condition is unlikely to be met, adding a tone of wishfulness or critique.
At a glance
| 凡是 | 但凡 | |
|---|---|---|
| Core function | States a universal rule or fact | Introduces a hypothetical condition |
| Register | Neutral to formal; common in written and spoken | Literary, formal; rare in casual conversation |
| Typical paired words | 都 / 就 (indicating inevitability) | 也 / 都 / 就 (in the result clause) |
| Negation | Common: 凡是不… (everyone who doesn't…) | Rarely negates the condition itself; but result can be negative: 但凡…也不… |
| Hypothetical vs actual | Asserts a real, general truth | Settings a hypothetical, often minimal, condition |
Examples
- 凡是凡是违反校规的学生都会受到处罚。Fánshì wéifǎn xiàoguī de xuésheng dōu huì shòudào chǔfá.All students who violate school rules will be punished.States a universal rule; use 凡是 not 但凡.
- 凡是凡是参加比赛的人都要提前报名。Fánshì cānjiā bǐsài de rén dōu yào tíqián bàomíng.Everyone who participates in the competition must register in advance.Again, factual requirement.
- 但凡但凡你肯努力，就一定能成功。Dànfán nǐ kěn nǔlì, jiù yīdìng néng chénggōng.As long as you are willing to work hard, you will definitely succeed.Hypothetical condition; emphasizes minimal effort.
- 但凡但凡有一点可能，我也不会放弃。Dànfán yǒu yīdiǎn kěnéng, wǒ yě bù huì fàngqì.If there were even the slightest possibility, I would not give up.Hypothetical condition implying the condition is unlikely; literary tone.
- 凡是凡是学生都要遵守校规。Fánshì xuésheng dōu yào zūnshǒu xiàoguī.All students must follow school rules.Simple universal statement.
- 但凡但凡他来过一次，也不至于这么陌生。Dànfán tā láiguò yīcì, yě bùzhìyú zhème mòshēng.If he had come even once, it wouldn't be so unfamiliar.Regret about a missed condition; literary.
Common mistakes
- Using 凡是 in a hypothetical condition: ✗ 凡是你能来就好了 → should be 但凡.
- Using 但凡 for a universal rule: ✗ 但凡学生都要考试 → should be 凡是.
- Forgetting to pair 凡是 with 都 or 就: ✗ 凡是学生要遵守校规 → should include 都.
- Using 但凡 in casual conversation where 只要 or 如果 is more natural (e.g., ✗ 但凡你愿意，我就开心 → overly literary).
- Confusing 凡是 with 凡事 (fánshì, 'everything'): 凡事 refers to matters, not people or categories.
FAQ
- When do I use 凡是 vs 但凡?
- Use 凡是 to state a universal rule or fact that applies to all cases without exception (e.g., '凡是不懂就问的学生学得好'). Use 但凡 to introduce a hypothetical condition that may or may not be true, often in literary contexts (e.g., '但凡他有点耐心，就不会发脾气').
- Can 凡是 be used in hypothetical sentences?
- No. 凡是 is for real, general truths. For hypothetical conditions, use 但凡, 如果, or 只要.
- Is 但凡 interchangeable with 只要?
- Partly, but 但凡 is more literary and emphasizes minimal or unlikely conditions. 只要 is neutral and common in spoken Chinese. For example, 只要你想学，就能学会 is natural; 但凡你想学，就能学会 is fine but sounds literary.
- Do I always need 都 after 凡是?
- In most cases, yes. 都 emphasizes the universal scope. In very formal or fixed expressions, 就 may be used instead (e.g., 凡是...就...), but 都 is the standard pairing.