Declension styles are applied to use the right declension combos to any determiner and/or adjective previous a noun. You might want to use ‘der Junge’ to state ‘the boy within the nominative circumstance then use ‘den Jungen’ in the accusative situation. ‘Dem Jungen’ implies the dative case. And ‘des Jungen’ https://junge43196.wikiinside.com/847043/gebiet_an_overview