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I would like to know if this sentence I have conjured up is grammatically correct or not, in particular regarding the case of the noun that follows the preposition über. As far as I have worked it out, the accusative case refers to direct objects and the dative case to indirect ones. Yet, in such sentences as what I have posted here, the prepositional phrase '' about the history of Germany'' acts as a post modifier for the direct object of the sentence ''Book.'' So obviously ''Buch'' is in the accusative case, but are we to modify what ever noun head in a prepositional phrase such as " .....für meine Schwester'' with the accusative case? or should it be Dative since the verb has ist own direct object aready?
- Ich möchte ein Buch über der Geschichte von Deutschland lesen.
Do we consider the case of nouns following prepositions like über dative or accusative?