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des

of the (genitive masculine/neuter singular)

Das ist das Auto des Mannes.

That is the man's car.

Die Farbe des Hauses ist weiß.

The color of the house is white.

((Noun)) + des + ((Noun (Genitive, m./n.))) (shows possession/belonging) the key of the car

Similar: eines (indefinite article genitive)

It's the genitive case form for the definite articles 'der' (masculine) and 'das' (neuter).

Think of 'des' as showing ownership for masculine and neuter nouns, like 'of the' or an apostrophe-s in English.

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