Feb 03, 2018 - 09:20 PM
Some prepositions always take the Dative case, these are called "Dative prepositions". These prepositions are: Aus, Außer, Bei, Mit, Nach, Seit, Von, Dir, Gegenüber.
Some prepositions always take accusative and some switch between dative and accusative, depending on the sentence. (The ones that switch are called "Wechselpräpositionen" in German, which means "Changing prepositions".)
(There are also prepositions that trigger the genitive case, but you should leave those for later.)