"Matěj má mnoho svetrů."
Translation:Matěj has many sweaters.
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Svetrů must be in the genitive because it is used with a generic expression of quantity. Mnoho, málo, několik, kolik, and numbers from 5 upward are all used with the genitive. The phrase "mnoho svetrů" as a whole is in the accusative, as that is what the verb "má" requires. We have something like case nesting going on here.