Sorry if I sound stupid just trying to understand as well as I can, but why does "eine Schlange hat den Frosch gefressen" take a "den" instead of "dem"? I thought den was only used for possession of plural objects and seeing as Frosch is a singular item this kind of confused me.
closed as off-topic by Eller, Beta, IQV, Hubert Schölnast, Dreikäsehoch Oct 7 '17 at 8:20
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It's den because it's the object of the sentence and is in the accusative case.
For possession of plural objects (genitive case) you would use der. e.g das Zeitalter der Menschen
"Den" is used for plural objects in the dative case. This is in contrast to the masculine singular "dem."
"Den" is also used for masculine singular objects in the accusative case. The nominative is "Der Frosch" but since the frog is being eaten, it is the direct object in the accusative case.
You would use the genitive case (not the dative) for a possessive, but there is nothing "possessive" about this sentence.