In English, "I didn't see nothing" is branded a mistake — the two negatives supposedly cancel out. In Brazilian Portuguese, the equivalent sentence is not a mistake; it is the only correct way to say it. Não vi nada is standard, neutral, educated Portuguese. This is negative concord: when a negative word follows the verb, the não in front of the verb is obligatory, and the two negatives agree rather than cancel. This page gives the systematic rule. (For the specific English-transfer errors it causes, see the double-negation-confusion error page.)
The rule is positional
Everything depends on where the negative word sits relative to the verb:
- Negative word AFTER the verb → you MUST keep 'não' before the verb.
- Negative word BEFORE the verb → you MUST drop 'não'.
That single positional contrast governs the whole system. Master it and you never have to wonder whether to "double up."
Pattern 1: negative word after the verb → 'não' is required
When the negative word — nada (nothing), ninguém (nobody), nunca/jamais (never), nenhum(a) (none) — appears after the verb, you must place não before the verb. Omitting it is ungrammatical.
Não vi nada.
I didn't see anything. (literally 'I didn't see nothing' — and this is the correct form)
Não conheço ninguém aqui.
I don't know anyone here.
Eu não vou nunca mais àquele restaurante.
I'm never going to that restaurant again.
Não tem nenhum problema.
There's no problem at all.
The não is not optional decoration — it is grammatically obligatory. Vi nada and Conheço ninguém are simply wrong; a native speaker would never produce them. The negative word after the verb requires its não partner in front.
You can even chain several post-verbal negatives, and they all stay in concord with the single não:
Ele nunca disse nada a ninguém sobre isso.
He never said anything to anyone about that. (one 'nunca' pre-verbal carries the negation; 'nada' and 'ninguém' agree with it)
Pattern 2: negative word before the verb → drop 'não'
When the same negative word moves in front of the verb (typically as the subject, or fronted for emphasis), it already carries the negation by itself. Now adding não would be wrong.
Ninguém veio à festa.
Nobody came to the party.
Nunca vi um pôr do sol assim.
I've never seen a sunset like this.
Nada aconteceu na reunião.
Nothing happened at the meeting.
Nenhum dos dois quis ajudar.
Neither of the two wanted to help.
Here não is absent and must be absent. Ninguém não veio is wrong in standard Portuguese (though you may rarely hear a colloquial reinforced Ninguém não veio não in very informal speech, it is non-standard and best avoided).
So the same negative word behaves differently depending on its position:
| Negative word | Before the verb (no 'não') | After the verb (with 'não') |
|---|---|---|
| ninguém | Ninguém ligou. | Não ligou ninguém. |
| nada | Nada mudou. | Não mudou nada. |
| nunca | Nunca esqueço. | Não esqueço nunca. |
| nenhum | Nenhum aluno faltou. | Não faltou nenhum aluno. |
Ninguém ligou hoje. / Não ligou ninguém hoje.
Nobody called today. (both correct — the difference is only word order and slight emphasis)
Both columns mean the same thing. The pre-verbal version often feels a touch more emphatic or formal; the post-verbal version (with não) is the everyday default. Choose based on rhythm and emphasis, not grammar — both are correct.
Why the negatives don't cancel
In English, negation is treated logically, like math: two minuses make a plus. In Portuguese (and in Spanish, French, Italian, and most of the world's languages, in fact) negation works by agreement, like gender or number. The negative feature spreads across the clause and every eligible word displays it. Não vi nada doesn't compute "not (not seeing)"; it expresses one single negation, marked redundantly on both não and nada because they have to agree. Think of it the way you think of plural agreement in os livros novos — the plural shows up on all three words, but there's still only one set of books.
Position with clitics and compound tenses
The same placement logic from the basic-'não' page applies: in não vi nada, if there were an object pronoun it would sit between não and the verb (Não me disse nada — "He didn't tell me anything"). In compound tenses, não still attaches to the auxiliary while the post-verbal negative word stays at the end.
Ele não tinha falado nada com a gente.
He hadn't said anything to us.
Eu não vou contar nada a ninguém.
I'm not going to tell anything to anyone.
Common Mistakes
❌ Eu vi nada na geladeira.
Incorrect — the post-verbal 'nada' requires 'não' before the verb. English's 'I didn't see anything' tricks learners into dropping it.
✅ Eu não vi nada na geladeira.
I didn't see anything in the fridge.
❌ Eu conheço ninguém nesta cidade.
Incorrect — same trap; 'ninguém' after the verb demands an obligatory 'não'.
✅ Eu não conheço ninguém nesta cidade.
I don't know anyone in this city.
❌ Ninguém não veio à reunião.
Incorrect — when 'ninguém' precedes the verb it already negates the clause; adding 'não' is non-standard.
✅ Ninguém veio à reunião.
Nobody came to the meeting.
❌ Nunca eu não esqueço o seu aniversário.
Incorrect — pre-verbal 'nunca' carries the negation alone; no 'não'.
✅ Nunca esqueço o seu aniversário.
I never forget your birthday.
❌ Ele não disse anything a ninguém.
Incorrect — there's no Portuguese 'anything' to substitute; the negative word itself is 'nada', kept in concord with 'não'.
✅ Ele não disse nada a ninguém.
He didn't say anything to anyone.
Key takeaways
- Negative concord is correct and required in Brazilian Portuguese: Não vi nada, Não conheço ninguém, Não vou nunca are all standard.
- The rule is positional: negative word after the verb → não is obligatory in front; negative word before the verb → drop the não.
- The negatives reinforce each other, they don't cancel — it's agreement, not arithmetic.
- Turn off the English "two negatives make a positive" instinct; English is the global exception, not Portuguese.
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Start learning Portuguese→Related Topics
- Double Negation ConfusionA2 — Why 'não vi nada' is correct, not wrong — Brazilian Portuguese requires negative concord, and the emphatic 'não...não' tail is a real feature, not an error.
- Negative Words: Nada, Nunca, Ninguém, NemA1 — The Brazilian Portuguese negative words and the positional rule that decides whether they need 'não' alongside them.
- Negation: OverviewA1 — How Brazilian Portuguese says no — 'não' before the verb, obligatory negative concord, the emphatic 'não...não' tail, and a map of the whole negation system.
- Basic Negation with 'Não'A1 — How 'não' works as both 'no' and 'not', where it sits relative to the verb and clitics, how it behaves in compound tenses, and the friendly doubled 'não...não'.
- Negation and Clitic PlacementB1 — How negation forces the object pronoun in front of the verb: 'não', 'nunca', 'ninguém' and 'nem' are all proclisis triggers, so the negator and the clitic stack up before the verb.