không ai

In Vietnamese, không ai sits before the verb or predicate to mean "nobody" or "no one."

Key Nuances:

• Emphasis: Native speakers frequently add cả (standard written nationwide and Northern spoken) or hết (preferred in the South but also common in Northern informal speech) at the end of the sentence to make the negation sound more natural and emphatic (e.g., Không ai biết cả = Nobody knows at all).
• Not a single fused word: Unlike the English word "nobody," không ai is made of two separate words. This means other words can be inserted between them for emphasis, such as không một ai (not a single person) or không có ai (there is no one).
• Subject vs. Object: Không ai is primarily used as a subject. It cannot be used in the object position at all (neither direct, indirect, nor object of a preposition). For example, you cannot say Tôi nói chuyện với không ai. To say "I see nobody," you must negate the verb instead: Subject + không + verb + ai (cả) (e.g., Tôi không thấy ai cả). This is because không ... ai literally translates to "not ... anyone", making the structure perfectly logical (i.e., "I do not see anyone") rather than just a restriction to memorize. However, không ai can be used as a standalone short answer (e.g., Không ai cả = Nobody), as the subject of a subordinate clause (e.g., Tôi thấy không ai quan tâm = I see that nobody cares), or as a predicate nominal in phrases like không ai khác (none other than, e.g., Người đó không ai khác chính là anh ấy = That person is none other than him).
• With Tense Markers: When using tense markers like sẽ, đang, or đã, placing them after không ai (e.g., Không ai sẽ đến) is grammatically valid and appears in translated literature or poetic contexts, but it can sound like a direct translation from English. In everyday speech, native speakers prefer placing the tense marker before không ai. Both Sẽ không ai đến and the existential Sẽ không có ai đến (Nobody will come) are the most idiomatic phrasings.
• Double Negation: The pattern Không ai (là) không + [verb] or Không ai mà không + [verb] literally means "Nobody is not [verb]," which is an emphatic way to say "Everyone [verbs]" (e.g., Không ai là không biết or Không ai mà không biết = Everyone knows).
• Question Word Rule: Vietnamese creates absolute negations by combining không with question words (e.g., không gì = nothing, không đâu = nowhere). Không ai follows this exact pattern, combining the negator with the question word ai (which functions as both "who" and the indefinite pronoun "anyone/anybody").
• Unsurpassed (không ai bằng): A highly frequent comparative pattern is không ai bằng (nobody compares to / unsurpassed). For example, Cô ấy đẹp không ai bằng (Nobody is as beautiful as her).

Similar Patterns:

• Không có ai: Interchangeable with không ai when used before a verb, but không có ai can also stand alone to mean "There is nobody [here]."
• Ai không: Reversing the order changes the meaning to "Who doesn't...?" (e.g., Ai không đi? = Who isn't going?).
• Chưa ai / Chẳng ai / Chả ai: The negator không can be swapped with chưa (not yet), chẳng (emphatic "not"), or chả (colloquial "not") to create chưa ai (nobody yet), chẳng ai (nobody at all), or chả ai (nobody at all, colloquial).