This is a study of the acquisition of prepositional case in a bilingual child, with special attention to the mutual import of linguistic theory on theories of language acquisition and vice versa. Another point of interest is the nature of grammatical and lexical representations in bilinguals. I discuss the nature of lexical entries of German prepositions that assign two different cases and motivate my claim that the main problem for the child is to establish the correct format for lexical entries, and that the observed development can best be accounted for by a German-internal explanation, thus ruling out any influence of the child's bilingual situation.

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