German says "no" in two main ways, and choosing between them is the first real decision a learner makes about negation. English gets by with one all-purpose "not" plus "no" before nouns ("I don't have a car" / "I have no car"). German formalizes that split into two distinct words with a clear division of labour: kein negates nouns, nicht negates everything else. The good news is that the choice is almost entirely mechanical — it depends on a single question about the noun's article — so once you learn the test, you will get it right without thinking.
The core division of labour
| Negator | Negates | Trigger |
|---|---|---|
| kein | nouns | the noun would otherwise have ein or no article |
| nicht | verbs, adjectives, adverbs, and nouns with a definite/specific article | everything else |
Look at the two negators side by side on near-identical sentences:
Ich habe kein Auto.
I don't have a car. (no article before Auto → kein)
Ich kenne ihn nicht.
I don't know him. (negating the verb 'kennen' → nicht)
In the first, you are negating a noun that would otherwise be ein Auto or just Auto — so you use kein. In the second, there is no indefinite noun to negate; you are negating the action of knowing, so you use nicht. That is the whole system in two sentences.
When to use kein
Use kein when the noun you want to negate would otherwise appear with the indefinite article ein or with no article at all (bare plurals, mass nouns, many abstract nouns). kein literally fuses "not" with the indefinite article — it is the negative counterpart of ein.
Das ist keine gute Idee.
That's not a good idea. (would be 'eine gute Idee' → kein)
Wir haben keine Milch mehr.
We've run out of milk. (mass noun with no article → kein)
Sie hat keine Geschwister.
She doesn't have any siblings. (bare plural 'Geschwister' → kein)
Notice that kein declines exactly like ein — kein Auto, keine Idee, keine Geschwister — taking the same case, gender, and number endings (with the bonus that it also has plural forms, which ein lacks). The endings are covered in detail on the kein declension page; for now, just match it to ein.
When to use nicht
Use nicht for everything kein does not cover. That means three big situations.
1. Negating a verb / the whole action. When you simply deny that something happens, nicht negates the verb.
Heute arbeite ich nicht.
I'm not working today.
Das stimmt nicht.
That's not true.
2. Negating an adjective or adverb. nicht goes directly in front of the word it negates.
Der Film war nicht gut.
The film wasn't good. (negating the adjective 'gut')
Sie wohnt nicht weit von hier.
She doesn't live far from here. (negating the adverb 'weit')
3. Negating a noun that already has a definite or specific article. This is the crucial overlap with nouns. If the noun comes with der/die/das, a possessive (mein, dein), or a demonstrative (dieser), it is already specific — so kein is impossible, and you use nicht.
Ich kenne den Mann nicht.
I don't know the man. (definite article 'den' → nicht, not kein)
Das ist nicht mein Auto.
That's not my car. (possessive 'mein' → nicht)
The contrast is the heart of the system: Ich habe kein Auto (I have no car — indefinite) versus Das ist nicht mein Auto (that's not my car — specific, possessed). The article on the noun decides everything.
Why German splits "not" in two
English speakers often wonder why German bothers with two words when "not" seems to do the whole job in English. The answer is that English also has this split — it just hides it. Compare "I have no car" with "I do not see the car." English uses no (a determiner) before an indefinite/article-less noun and not (an adverb) elsewhere. German makes the same cut, only it is obligatory and visible: kein is the determiner-negator (it sits in the article slot and declines like one), and nicht is the adverb-negator (it floats in the clause). So the rule is not a German quirk — it is the same logic as English no vs not, made systematic. Once you map kein onto "no [a/some]" and nicht onto "not," the choice feels natural.
A quick decision summary
| You want to negate… | Use | Example |
|---|---|---|
| a noun with ein | kein | kein Auto |
| a noun with no article (mass/plural) | kein | keine Milch |
| a noun with der/die/das | nicht | nicht der Mann |
| a noun with mein/dieser | nicht | nicht mein Auto |
| a verb / the action | nicht | arbeite nicht |
| an adjective or adverb | nicht | nicht gut |
Common Mistakes
❌ Ich habe nicht ein Auto.
Incorrect — German fuses 'not + ein' into kein; you can't say 'nicht ein' here.
✅ Ich habe kein Auto.
I don't have a car.
The single most common negation error for English speakers, copied straight from "I do not have a car." Where English keeps "not" and "a" as separate words, German merges them into kein.
❌ Das ist kein mein Auto.
Incorrect — kein cannot combine with a possessive; a specific noun takes nicht.
✅ Das ist nicht mein Auto.
That's not my car.
Using kein with a definite/specific noun. kein only replaces ein or a zero article; a noun that already has mein (or der, dieser) is negated with nicht.
❌ Wir haben nicht Milch mehr.
Incorrect — a mass noun with no article is negated with kein, not nicht.
✅ Wir haben keine Milch mehr.
We've run out of milk.
Reaching for nicht with an article-less mass noun. No article → kein.
❌ Ich kenne ihn kein.
Incorrect — you're negating the verb 'kennen', not a noun, so it must be nicht.
✅ Ich kenne ihn nicht.
I don't know him.
Using kein where there is no noun to negate. The object ihn is a pronoun and the negation falls on the action — that is nicht territory.
❌ Der Film war kein gut.
Incorrect — adjectives are negated with nicht, never kein.
✅ Der Film war nicht gut.
The film wasn't good.
Applying kein to an adjective. kein negates nouns only; adjectives and adverbs always take nicht.
Key Takeaways
- German has two main negators: kein for nouns, nicht for everything else.
- The test is one question: would the noun otherwise take ein or no article? Yes → kein; otherwise → nicht.
- kein declines like ein and is its negative twin (kein Auto, keine Idee, keine Milch).
- nicht negates verbs, adjectives, adverbs, and specific nouns (those with der/die/das, mein, dieser).
- Never say nicht ein for "not a" — German fuses it into kein.
Now practice German
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Start learning German→Related Topics
- nicht vs keinA2 — How to choose between German's two negators — kein for nouns that would take ein or no article, nicht for everything else.
- kein: Forms and UseA2 — How 'kein' declines like an ein-word but uniquely adds a plural, and why it — not 'nicht' — is the negator for indefinite, plural, and mass nouns.
- The Position of nichtB1 — How 'nicht' fits into the wider negation toolkit, what it negates versus 'kein', and how its position marks the scope of negation.
- Negative Words: nie, niemand, nichts, nirgendsA2 — The negative pro-forms that negate on their own — never, nobody, nothing, nowhere — and how each pairs with a positive counterpart in a clean system.
- Negating with keinA1 — How German negates noun phrases with the negative article kein, and why the choice between kein and nicht is the central German negation decision.