Cases

German marks the job a noun is doing in the sentence by changing the word in front of it. English does this too, but only on pronouns — we say he when it is the subject and him when it is the object, and nobody finds that hard. German just does it more consistently, and on the article rather than the noun.

There are four jobs. Learn what each one is for and the tables become something you can reconstruct rather than recite.

Nominative — the one doing the verb

This is the dictionary form and the subject of the sentence.

Der Hund schläft. — The dog is sleeping.

Test: ask who or what is doing this? The answer is nominative.

Nominative also follows the verbs sein, werden and bleiben. These do not act on anything; they link two descriptions of the same thing, so both sides stay nominative.

Er ist ein guter Lehrer. — He is a good teacher.

That trips up English speakers who expect an object after "is". There is no object. Er and ein guter Lehrer are the same person.

Accusative — the thing the verb acts on

The direct object: what gets seen, bought, eaten, built.

Ich sehe den Hund. — I see the dog.

Test: ask whom or what? after the verb.

Here is the useful part: only the masculine changes. der → den. Feminine, neuter and plural look exactly the same as the nominative.

Three-quarters of the accusative is free. That is worth knowing before you start memorising a grid.

Dative — the one on the receiving end

The indirect object: the person something is given, told, sent or shown.

Ich gebe dem Hund einen Knochen. — I give the dog a bone.

Two objects here. Einen Knochen is what is given (accusative). Dem Hund is who receives it (dative).

Test: ask to whom, for whom?

Note the plural: dative plural adds -n to the noun as well, unless the plural already ends in -n or -s. die Kinder → den Kindern, die Häuser → den Häusern.

The catch is that der now means something different depending on where it sits. Der Katze is dative feminine, not nominative masculine. Context disambiguates, and this is exactly why word order alone will not tell you what a German sentence means.

Some very common verbs take dative where English expects a direct object: helfen, danken, gehören, gefallen, folgen, antworten. Ich helfe dir, not ich helfe dich. These have to be learned individually — there is no rule, only a list, and it is a short list.

Genitive — possession

Das Auto des Mannes — the man's car

Masculine and neuter take des and add -s or -es to the noun (a few masculine nouns take -n or -en instead: des Studenten, des Herrn). Feminine and plural take der and change nothing.

In speech, Germans very often replace the genitive with von + dative: das Auto vom Mann. You will hear that constantly. The genitive is alive in writing, in fixed expressions, and after certain prepositions (während, wegen, trotz, statt), but you can hold a long conversation without producing one.

Learn to recognise the genitive early. Learn to produce it later.

Prepositions decide the case

This is where most of the real work is.

Always accusative: durch, für, gegen, ohne, um. Always dative: aus, bei, mit, nach, seit, von, zu.

These do not vary. Mit is always dative, für is always accusative, no matter what follows.

The two-way prepositions: an, auf, hinter, in, neben, über, unter, vor, zwischen.

These take accusative for movement into a place and dative for position in a place.

Ich gehe in die Stadt. — I'm going into town. (movement → accusative)

Ich bin in der Stadt. — I'm in town. (position → dative)

The test is not "is there motion?" — it is "does the motion cross into the place?" Someone running around inside a room is moving, but not entering, so it stays dative: Ich laufe im Zimmer herum.

What to actually memorise

Do not start with the full grid. Start with these:

1. den is masculine accusative (and also dative plural). It is the single most common case ending you will need.
2. dem is masculine and neuter dative, der is feminine dative.
3. The dative-plural -n on the noun.
4. The always-accusative and always-dative preposition lists — about twelve words, and they buy you most sentences.

Everything else you can work out from the job the noun is doing. Cases are not arbitrary decoration; each one answers a question about the sentence, and once you ask the question the ending follows.