没 vs 未 (méi vs wèi): colloquial vs formal 'not yet'
Both 没 and 未 negate completion, but they differ in register. 没 (méi) is the default spoken and informal written choice, used for everyday negation of past actions and existence. 未 (wèi) is a formal/literary alternative, typical in written Chinese, news, and fixed expressions. Choosing the wrong one can make speech sound stilted or writing too casual.
Both 没 (méi) and 未 (wèi) are used to negate completion of an action or state, equivalent to 'not yet' or 'have not'. The primary difference is register: 没 is the default in spoken and informal written Chinese, while 未 is reserved for formal, literary, or stylized contexts. 未 often appears in fixed expressions and with adverbs like 尚 (shàng) or 曾 (céng). Additionally, 没 can negate existence (没有), whereas 未 does not. Using 未 in casual conversation sounds archaic or overly bookish, while using 没 in formal writing may be considered too casual.
When to use each
Use 没 in everyday speech, informal writing, and most standard Chinese to indicate that an action has not occurred or is not complete. It is also the standard negator for existence (没有). For example: 我没吃饭 (I haven't eaten). It is the default choice for negating past actions in conversation.
没 is also used with 有 (méiyǒu) to negate possession or existence, e.g., 我没有钱 (I have no money). In some dialects or very casual speech, 没 alone can replace 没有 in existential negation.
Use 未 in formal, literary, or written Chinese (e.g., news, official documents, classical-style prose) to indicate something has not yet happened or is not complete. It often pairs with 尚 (尚未) or 曾 (未曾). For example: 问题尚未解决 (The problem has not yet been resolved). It is also common in set phrases like 未来 (future, lit. 'not yet come').
未 cannot negate existence or possession; for that, 没有 is always used. In very formal contexts, 未 may appear in expressions like 前所未有 (unprecedented, lit. 'never before had'). It is typically not used in spoken Chinese except in fixed idioms or when quoting literary language.
At a glance
| 没 | 未 | |
|---|---|---|
| Register / Context | Spoken, informal writing, standard Chinese | Formal writing, news, literature, fixed expressions |
| Negation of existence | Yes: 没有 (méiyǒu) | No: 未有 is archaic and restricted to very formal phrases like 前所未有 |
| Common collocations | 没 + verb, 没有 + noun | 未 + verb, 尚未 + verb, 未曾 + verb |
| Tone / naturalness in speech | Natural and expected | Sounding archaic or overly formal |
Examples
- 没我还没吃饭。Wǒ hái méi chīfàn.I haven't eaten yet.没 is the default colloquial choice; 未 would sound odd in conversation.
- 未任务尚未完成。Rènwù shàng wèi wánchéng.The task has not yet been completed.Using 没 here (任务还没完成) is possible but less formal; 尚未 is a typical formal collocation.
- 没我没有钱。Wǒ méiyǒu qián.I have no money.Negation of existence requires 没有; 未 cannot be used here.
- 未此事前所未有。Cǐ shì qián suǒ wèi yǒu.This is unprecedented.Fixed expression using 未 (未有 in this idiom); 没有 would be incorrect here.
- 未他未回答我的问题。Tā wèi huídá wǒ de wèntí.He did not answer my question. (formal)Formal written style; in spoken Chinese, 他没回答我的问题 would be natural.
Common mistakes
- Using 未 in casual spoken sentences, e.g., '我未吃饭' instead of '我没吃饭'. This sounds overly formal or archaic.
- Using 未 to negate existence: '我未有钱' is wrong; always use 没有.
- Confusing 未 with 没 in negative imperative or habitual contexts: 未 is not used for 'don't' (别) or 'never' (从不) — it strictly negates completion.
- Creating ungrammatical hybrid phrases like '尚无未有' — the correct formal expressions are '尚未有' or '尚无', not a double negation.
FAQ
- When do I use 没 vs 未?
- Use 没 for everyday speech, informal writing, and most standard Chinese to mean 'not yet' or 'have not'. Use 未 only in formal or literary contexts—such as news, official documents, or classical-style writing—where a more refined tone is required. In spoken Chinese, 未 is almost never used.
- Can 未 be used in spoken Chinese?
- It can, but it sounds very formal, archaic, or elevated. Native speakers rarely use 未 in casual conversation unless they are quoting a set phrase (e.g., 未来 wèilái 'future') or intentionally adopting a literary tone. Stick to 没 in daily speech.
- What is the difference between 没有 and 未有?
- 没有 (méiyǒu) is the standard negation of existence and possession, widely used in both speech and writing. 未有 (wèiyǒu) is a very formal/literary expression meaning 'have not yet had' or 'there has not yet been' and only appears in fixed idioms like 前所未有 (unprecedented). You should not use 未有 in place of 没有 in ordinary spoken or written Chinese.
- Is '尚未有' the same as '还没有'?
- Yes, both mean 'not yet have', but they belong to different registers. 还没有 (hái méiyǒu) is colloquial and standard. 尚未有 (shàng wèi yǒu) is very formal and used almost exclusively in written Chinese. Do not combine them: say either 还没有 or 尚未有, never '尚无未有' (which is ungrammatical).