German Negation: Nicht or Kein, and Where Nicht Goes

English says not, or its contraction, and moves on: I don't have a car, I don't know the man, it isn't good. One word, one place, straight after a helper verb that English drafts in specially for the purpose.

German refuses to be that simple, and it is right to. It has two words for no, nicht and kein, and the choice between them is not a matter of style. They negate different things, and in a surprising number of sentences picking the wrong one produces something that is not clumsy but genuinely different. The good news is that the rule deciding between them is short, mechanical and has almost no exceptions. The part that takes practice is where nicht goes.

The rule: kein replaces ein

Ask one question about the thing you are negating: is it a noun that would otherwise have ein in front of it, or no article at all? If yes, use kein. In every other case, use nicht.

That is it. Watch it work:

The easiest way to hold it is that kein is literally a k plus ein. It slots into the place where ein would have gone, or where an article would have gone if the noun had one. Where the noun already has der, die, das or a possessive, that slot is taken, and kein has nowhere to go.

This is also why a noun with der, die, das or a possessive takes nicht. Ich habe das Buch nicht is about a particular book you have not got. Ich habe kein Buch says you have no book of any kind. The article already told you which one was meant, and German negates around it rather than replacing it.

Some of the commonest phrases in the language are kein phrases, and they are worth learning whole:

Ich habe keine Ahnung. - I have no idea.

Keine Angst! - Don't worry! (literally, no fear)

Ich habe keine Zeit. - I have no time.

Kein Problem. - No problem.

kein declines exactly like ein

Because kein stands where ein stood, it takes the same endings, and it has the plural that ein has no use for:

If you have read German possessive pronouns, this is the same table with a different first letter: mein, meine, meinen becomes kein, keine, keinen. The ending you need is the ending ein would have had in the same slot.

The masculine accusative is the one to watch, as always. Hunger is masculine, so a sentence about having none of it needs -en:

Ich habe keinen Hunger. - I am not hungry.

Er trinkt keinen Kaffee. - He does not drink coffee.

Where nicht goes

nicht never changes its form, which is the good news. It does move, and that is the part of German negation that genuinely takes time.

The default: late in the sentence

When nicht negates the whole statement, it goes after the conjugated verb, after any object that has an article or is a pronoun, and after most time words:

Ich komme nicht. - I am not coming.

Ich kenne den Mann nicht. - I don't know the man.

Ich verstehe das nicht. - I don't understand that.

Er arbeitet heute nicht. - He is not working today.

For English speakers this feels backwards: the sentence seems to have finished before anyone mentions that it is not true. That is how German works, and after a while you start listening for the end of the sentence, which German trains you to do anyway.

The exception: in front of anything that completes the verb

Some parts of a sentence are so tightly bound to the verb that nicht goes in front of them rather than after:

The pattern is that nicht pushes as far towards the end as it can, and stops in front of whatever finishes the verb's meaning. An infinitive after a modal, as in the German modal verbs, always finishes the clause, so nicht sits just before it.

A working test, until the placement becomes instinct: say the sentence positively first, then walk nicht towards the end of the clause. Let it pass the verb, the pronouns, the nouns with der or den, and the time words. Stop it the moment it reaches an adjective, a place, or the verb form waiting at the end. That is where it lives, and you will be right far more often than wrong.

Negating one thing on purpose

Put nicht directly in front of a single word and you negate only that word, usually because a correction is coming with sondern (but rather):

Nicht heute, sondern morgen. - Not today, tomorrow.

Ich trinke keinen Kaffee, sondern Tee. - I don't drink coffee, I drink tea.

sondern is the but that follows a negative and replaces the thing negated. The ordinary aber is the but that adds a contrast without cancelling anything. Nicht X sondern Y is a pattern Germans use constantly, and it is one of the easier ways to sound as if you know what you are doing.

The grey zone: nouns that behave like part of the verb

The rule has one soft edge, and it is worth knowing so that it does not unsettle you when you meet it. Some nouns fuse with their verb into a single activity: driving a car, speaking a language, playing a sport. There the noun is closer to part of the verb than to an object, and German often negates the activity with nicht:

Ich fahre nicht Auto. - I don't drive.

Ich spreche kein Deutsch. - I don't speak German.

The first is about not being a driver at all, not about lacking a car, so kein Auto would change the meaning. The second shows the language case going the other way: kein Deutsch is the usual form, and nicht Deutsch is heard too, especially in contrasts (not German, but English). You will hear both. Neither is a reason to doubt the main rule, which settles the other ninety-odd per cent of sentences without argument.

The other negative words

Beyond nicht and kein there is a small family worth having ready. None of them combines with a second negative:

noch nicht and kein ... mehr are mirror images and worth learning as a pair: not yet looks forward to something happening, no more looks back at something that has stopped.

doch: the yes that contradicts

English answers a negative question with a stressed yes, I do. German has a dedicated word for it:

Hast du keine Zeit? Doch, ich habe Zeit. - Don't you have time? Yes, I do.

Kommst du nicht? Doch! - Aren't you coming? Yes, I am!

Answering ja to a negative question is ambiguous in German in the same way yes is ambiguous in English, and Germans will often ask you which you meant. doch removes the doubt: it means the negative in the question was wrong.

Mistakes English speakers make

1. nicht ein for kein. Ich habe nicht ein Auto is not how Germans say it. ein plus negative is kein, every time, unless you mean not one single car, which is an emphatic and much rarer sentence.
2. Negating with a helper verb. English builds I don't know with do. German has no equivalent, and the learner who reaches for tun as a helper produces something that sounds like dialect at best. The verb itself carries the negative: Ich weiß es nicht.
3. nicht straight after the subject. Ich nicht komme follows English word order and German does not. In a main clause the verb is second, and nicht comes after it.
4. kein in front of der, die or das. You cannot negate a noun that already has a definite article with kein. Keep the article and use nicht: Ich kenne den Mann nicht.
5. Double negatives. Ich habe nicht nichts is a double negative in German exactly as in English, and it does not mean what an English speaker in a hurry thinks it means.
6. ja where doch belongs. It is not wrong, just unclear, and doch is one short word.

What to do next

Learn the rule as a single question - would this noun have ein, or no article? - and apply it before you open your mouth until you no longer need to. Then pick three kein phrases (keine Ahnung, keine Zeit, kein Problem) and three nicht sentences (Ich komme nicht, Das ist nicht gut, Ich kann nicht kommen) and use them until the placement stops feeling strange.

The plural row of the kein table depends on knowing the plural of the noun you are negating, and German plurals are their own small project: German noun plurals is the next lesson for that reason. When you want to practise choosing between nicht and kein on real sentences, the German course drills it with the nouns you already know.