Ich gehe durch den Park.
English: I walk through the park.
In German, some prepositions always use the accusative case. That means the noun or pronoun after these prepositions changes to the accusative form.
Use these prepositions when you want to talk about movement, direction, purpose, or specific situations in German. After these prepositions, the noun or pronoun always takes the accusative case.
Ich gehe durch den Park.
English: I walk through the park.
Das Geschenk ist für meinen Bruder.
English: The present is for my brother.
Wir spielen ohne unsere Freunde.
English: We play without our friends.
Sie kämpfen gegen die Zeit.
English: They fight against time.
Wir treffen uns um den Tisch.
English: We meet around the table.