Cases are a grammatical tool to express relations of entities to the actions of the sentence. They can be marked by endings, prefixes or through modifications of the word itself.
Many languages have cases, but there are also many that don’t have any cases. Those then use prepositions to express these relations.
German has four cases that mainly revolve around “roles”. Other languages have several cases that are about location in some way. English has cases, too, but they’re pretty “washed out” so you need to know where to look for them.
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**Here are the posts in which I have talked about this concept in detail.**A fun look at what grammatical cases are, what they express and the burning question if we really need them (spoiler: no. BUT).

We'll explain the German cases once and for all. The first part give you a general overview and then deals with nominative and genitive.

In this episode, we'll talk about Accusative and Dative. We'll learn their core ideas and collect the most common verbs for each.
