In German, the indefinite article ein corresponds to the English "a" or "an." To negate these nouns, German uses a specific "negative article" called kein (no / not a / not any).
The articles ein and kein change their endings based on the gender of the noun and its case (its role in the sentence). Note that kein follows the exact same pattern as ein, but it also exists in the plural.
Like in English, ein has no plural. If you want to say "I have books," you simply say "Ich habe BΓΌcher." However, kein is used to negate plural nouns where no article was present.
In spoken German, the indefinite article is often unstressed and shortened. While we write the full form to distinguish it from the number "one" (eins), you will often hear these reductions in casual speech:
You must use kein instead of nicht when negating a noun that has an indefinite article or no article at all. It acts as the direct opposite of ein.
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