Nouns and pronouns following these prepositions are called "Objects of a Dative Preposition," and are always in the Dative Case. Note, gegenüber is one of the dative prepositions! In everyday language you may hear people use it with the genitive, while this is grammatically incorrect, it happens quite often!
Quizlet's Flash card function is probably the best choice to use this set. Otherwise you will have to correctly use commas, [ ], and ( ).
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