German marks the ROLE of a noun in the sentence by changing the article rather than the word order. The subject — the one doing the verb — is nominative. The direct object — the one the verb is done to — is accusative.
The good news is how little actually changes. In the accusative, only masculine changes:
- der → den (Ich sehe den Mann.)
- die → die (Ich sehe die Frau.)
- das → das (Ich sehe das Kind.)
- die (plural) → die (Ich sehe die Kinder.)
Everything else — feminine, neuter, plural — looks exactly as it did. So the whole of the accusative, at A2, is "der becomes den". The same pattern runs through ein → einen, mein → meinen, kein → keinen.
Where it matters:
- After most verbs with an object. Ich kaufe einen Tisch. Ich habe einen Bruder.
- After these prepositions, always: durch, für, gegen, ohne, um. Learn them as a block —
- many teachers chant them — because they take the accusative regardless of meaning. Ohne
- meinen Bruder. Für den Kurs.
- After the two-way prepositions when there is movement toward something: in, an, auf, über,
- unter, vor, hinter, neben, zwischen. Ich gehe in den Park (movement, accusative) against Ich
- bin in dem Park (position, dative — the next case you will meet).
The practical route to accuracy is not memorising tables. It is noticing, every time you write a sentence, which noun is doing and which is being done to — and checking the masculine ones.