Two-way prepositions (Wechselpräpositionen) take the accusative when there is movement toward a goal and the dative when there is location — auf den Tisch vs. auf dem Tisch. This free drill gives you ten example sentences — tap any sentence to reveal the translation and a short note on why it works. No signup. The full GrammarWerk app generates 30 fresh sentences per drill across 386 topics in German, Spanish, English, and French.
Nine prepositions take either accusative or dative depending on meaning: an (at/on), auf (on top of), in, über (over/above), unter (under), vor (in front of/before), hinter (behind), neben (next to), zwischen (between). Rule: accusative after movement/directed action (wohin? — where to?): Ich lege das Buch auf den Tisch (I put the book onto the table). Dative after static location (wo? — where?): Das Buch liegt auf dem Tisch (The book is lying on the table). The verbs legen/liegen, stellen/stehen, hängen/hängen, setzen/sitzen, legen/liegen embody this movement vs. location contrast.
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