German from First PrinciplesPost 5 of 19 · 19 of 19 written

5. Articles and declension: one set of endings

German · 5 of 193 min readNov 2026

Every article form comes from one table of sixteen strong endings attached to a stem. Learn this table once and der, dieser, jeder, welcher, ein, kein, mein and the adjective endings all fall out of it.

The strong endings

Case Masculine Feminine Neuter Plural
Nominativ -er -e -es -e
Akkusativ -en -e -es -e
Dativ -em -er -em -en
Genitiv -es -er -es -er

Put them on dies- and you get the whole der-word paradigm: dieser Mann, diesen Mann, diesem Mann, dieses Mannes. The definite article is the same system with a fused stem: der, die, das, die / den, die, das, die / dem, der, dem, den / des, der, des, der. Das is the neuter -es signal in a fused form, just as dem is -em.

Five patterns that shrink the table

  1. Nominativ = Akkusativ everywhere except masculine. Only the masculine changes -er → -en.
  2. Feminine and plural are twins in Nominativ, Akkusativ (-e) and Genitiv (-er).
  3. Masculine and neuter are twins in Dativ (-em) and Genitiv (-es).
  4. -er appears in four cells: masculine Nominativ, feminine Dativ, feminine Genitiv, plural Genitiv. So der can be four different things; context decides.
  5. Dativ plural is -en, and the noun adds -n if its plural does not already end in -n or -s: mit den Kindern, mit den Autos.

The signature letters are worth memorising as a sound: masculine r – n – m – s, feminine e – e – r – r, neuter s – s – m – s, plural e – e – n – r.

Der-words and ein-words

Der-words take the strong endings in every cell: der, dieser, jener, jeder, mancher, welcher, solcher, and alle in the plural.

Ein-words are ein, kein and the possessives (mein, dein, sein, ihr, unser, euer, Ihr). They take the same strong endings with one crucial difference: three cells have no ending at all.

Case Masculine Feminine Neuter Plural (kein / mein)
Nominativ ein (gap) eine ein (gap) keine
Akkusativ einen eine ein (gap) keine
Dativ einem einer einem keinen
Genitiv eines einer eines keiner

Those three gaps (masculine Nominativ, neuter Nominativ, neuter Akkusativ) are the single reason adjective endings look different after ein than after der. Section 7 builds directly on them.

Possessives: two decisions, not one

A possessive answers two separate questions. The stem comes from the owner: mein (my), dein, sein (his, its), ihr (her, their), unser, euer, Ihr (your, formal). The ending comes from the possessed noun’s gender and case.

Sie besucht ihren Vater: ihr- because she is the owner, -en because Vater is masculine Akkusativ. Er hilft seiner Mutter: sein- because he is the owner, -er because Mutter is feminine Dativ (helfen takes Dativ).

Genitiv and Dativ on the noun itself

Masculine and neuter nouns add -s or -es in the Genitiv singular: des Mannes, des Autos, des Computers. Use -es mostly after one-syllable nouns and after s, ß, x, z (des Hauses, des Platzes). A Dativ singular -e (dem Manne) is archaic and survives only in fixed phrases: zu Hause, im Grunde, nach Hause.