The Case system in Greek grammar is a method to show the role played by a noun, pronoun, adjective, or numeral in the sentence. Greek has four cases: nominative, genitive, dative, and accusative. Each case has its use and can significantly change the meaning of a sentence if used incorrectly. The grammatical case affects the ending of the word, hence mastering the case system is indispensable for clear and accurate communication in Greek.