In der Abteilung des Museums hängt ein altes Gemälde.

In the department of the museum hangs an old painting.

Breakdown of In der Abteilung des Museums hängt ein altes Gemälde.

• in: in
• alt: old
• das Museum: the museum
• hängen: to hang

Questions & Answers about In der Abteilung des Museums hängt ein altes Gemälde.

Why does in take the dative case here (“in der”, not “in die”)?

German prepositions can govern different cases depending on meaning. in uses:

• the dative (Wo? – location)
• the accusative (Wohin? – direction/movement)
  Here we’re stating where the painting hangs (location), so we use dative. The feminine noun die Abteilung becomes der Abteilung in dative.

Why is des Museums in the genitive case?

We need to show possession or belonging (“the museum’s department”). German typically does this with the genitive. The genitive singular of das Museum is des Museums, so Abteilung des Museums means “department of the museum.”

Why does Museum get an extra -s in the genitive?

Most masculine and neuter nouns add -s (or -es for very short words) in the genitive singular. Museum is neuter and takes the simple -s: des Museums.

Can I replace des Museums with vom Museum?

Yes. Colloquially you can avoid the genitive by using von + dative: von dem Museum → vom Museum. It’s common in speech, though the genitive (des Museums) is preferred in formal or written German.