Two-way prepositions: in den or in dem?
in, an, auf, über and friends take either accusative or dative. The rule is movement versus location — here is how to apply it instantly.
Nine German prepositions can take either the accusative or the dative: in, an, auf, über, unter, vor, hinter, neben, zwischen. Which case you choose changes the meaning, so this is worth getting right.
Movement vs. location
Ask one question. If something is moving toward a destination, use the accusative (wohin? = where to?). If something is resting in a place, use the dative (wo? = where?). Ich gehe in die Schule (movement, accusative). Ich bin in der Schule (location, dative).
See the difference in pairs
- Ich hänge das Bild an die Wand. (I hang it onto the wall — accusative)
- Das Bild hängt an der Wand. (It hangs on the wall — dative)
- Die Katze springt auf den Tisch. (onto — accusative)
- Die Katze sitzt auf dem Tisch. (on — dative)
Watch the contractions
Germans often merge preposition and article: in das → ins, in dem → im, an das → ans, an dem → am. These are normal and expected in speech: Ich gehe ins Kino. Ich bin im Kino.
A quick mental test: can you replace the verb with go/put (movement) or be/stand/lie (location)? Movement verbs pull the accusative; state verbs pull the dative.
Frequently asked questions
How do I choose between accusative and dative with in?
Ask whether there is movement to a destination (wohin?) or a fixed location (wo?). Movement takes the accusative (in die Stadt), staying put takes the dative (in der Stadt).
What does ins mean?
ins is the contraction of in das, used for movement into a neuter place: ins Kino, ins Bett. The dative equivalent is im (in dem): im Kino.