German Case Forms Reference

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Main Functions of German Cases

Nominative

Accusative

Dative

Direct / indirect object is an English concept, not a German one.
It is more fruitful to think of objects as being either accusative or dative. A dative object is generally either a recipient / beneficiary of the action expressed by the verb, or else only somehow involved in it. The beneficiary relationship is often expressed by "to" or "for" in English.

Genitive


Als 'than, as' and wie 'like, as' govern no case.  Nouns and adjectives following them appear in the same case as the "standard" to which they are being compared:
Ich kann das viel besser als er.  'I can do that much better than he (colloquially him).' [standard in the nominative]
Mutti hat dich lieber als mich.  'Mom likes you better than me.' [standard in the accusative]
Similarly, the interrogative was für 'what kind' is caseless; function of the noun modified determines the case:
Was für ein Mensch bist du eigentlich? 'What kind of a person are you?' [nominative]
Was für einen Wagen hast du eigentlich? 'What kind of car do you have? [accusative]

Cases |  Def |  Indef |  Adj |  Noun |  Pron

Definite Articles & Demonstratives ('Which one?')

The/that/those, this/these, that/those, each, such, which...

  Masculine Neuter Feminine Plural
Nominative der das die die
Accusative den das die die
Dative dem dem der den
Genitive des des der der
The demonstratives dies- 'this', jed- 'each, every', manch- 'some', solch- 'such', welch- 'which' and a few others end are called "der-words" because they in the same letter as the definite article, preceded by -e- if it is a consonant:  
dieser Mann, diese Frau, dieses Kind

Cases |  Def |  Indef |  Adj |  Noun |  Pron

Indefinite Articles & Possessives  ('Which one?')

A/an, no/not any, my, your, her, his, its, our, their 

  Masculine Neuter Feminine Plural
Nominative ein* ein* eine keine
Accusative einen ein* eine keine
Dative einem einem einer keinen
Genitive eines eines einer keiner
* These forms have no endings in Masc. & Neut. Nom. Sing., Neut. Acc Sing.
Possessives and kein 'not any' are called "ein-words" because they follow the same pattern as ein:
Das ist unser Vater.
Kennst du meine Mutter?

Cases |  Def |  Indef |  Adj |  Noun |  Pron

Descriptive Adjectives ('What kind?')

Adjectives take endings whenever they precede the noun they modify (greater detail here):

  1. Most frequent: "Weak" or "reduced" endings -e / -en, used whenever the adjective is preceded by an article or possessive with an ending
    -e all nominative singular | neuter and feminine accusative singular
    -en elsewhere = all plural | all dative + genitive | masculine accusative singular
      Masculine Neuter Feminine Plural
    Nominative -e -e -e -en
    Accusative -en -e -e -en
    Dative -en -en -en -en
    Genitive -en -en -en -en
  2. Less frequent:  "Strong" or "Full" endings, similar to der, die, das, used unless the adjective is preceded by an article or possessive with an ending, i.e. either there is no article or possessive, or else there is an ein-word without an ending preceding the adjective.
      Masculine Neuter Feminine Plural
    Nominative -er -es -e -e
    Accusative -en -es -e -e
    Dative -em -em -er -en
    Genitive -en * -en* -er -er

    *Different from ending on der-words, which is -es

Cases |  Def |  Indef |  Adj |  Noun |  Pron

Nouns

1. Names add -s (no apostrophe!) in the genitive, regardless of gender or number; if the name already ends in an -s or -z, only an apostrophe is added. Martines Jacke, Hans' Handschuhe, Müllers Auto. Names of people precede the noun possessed, other names typically follow: die Zukunft Europas.

2. Other nouns add endings as follows (simplified for brevity):

3. Dictionaries cite the nominative singular forms of nouns, and use conventions to help you derive the other forms. Typically each noun entry is followed by its gender, then by the genitive singular ending, then by the nominative plural ending. A "-" with an umlaut means to umlaut the preceding full vowel, and by itself "-" means the noun takes no ending in the corresponding form.

Wagen m. -s, - nom sg der Wagen
gen sg des Wagens
nom pl die Wagen
Apfelsine f. -, -n nom sg die Apfelsine
gen sg der Apfelsine
nom pl die Apfelsinen
Ergebnis n. -ses, -se nom sg das Ergebnis
gen sg des Ergebnisses
nom pl die Ergebnisse
(dat pl den Ergebnissen)
Junge m. -n, -n nom sg der Junge
acc / dat / gen sg
den / dem / des Jungen
nom / acc / dat / gen pl
die / die / den / der Jungen

Cases |  Def |  Indef |  Adj |  Noun |  Pron

Personal Pronouns

  1st Sing
I
me
my
1st Pl
we
us
our
2nd Sing
you
you
your
2nd Pl
y'all
y'all
y'all's
2nd Formal
you
you
your
  Masculine
he
him
his
Neuter
it
it
its
Feminine
she
her
her
Plural
they
them
their
Nominative ich wir du ihr Sie   er es sie sie
Accusative mich uns dich euch Sie   ihn es sie sie
Dative mir uns dir euch Ihnen   ihm ihm ihr ihnen
Possessive
Pronoun*
mein unser dein euer Ihr   sein sein ihr ihr

*The possessive pronouns have endings which reflect the case, gender and number of the "noun possessed."
See Indefinite Articles above.

Interrogative Pronouns

Nominative
wer
who
Accusative
wen
whom
Dative
wem
whom
Genitive
wessen
whose

Notes

  1. As in English, there are no special interrogative forms for feminine or plural.
  2. If the person asked about if the object of a preposition, the preposition must be brought to the front of the sentence too, as in formal English:
    Auf wen wartest du? 'For whom are you waiting?'
      (Conversational English: 'Who are you waiting for?')
  3. These interrogative pronouns are used for questions (direct and indirect) only. Relative Pronouns explained here.

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