I know Modern Greek has four cases: nominative, vocative, accusative, and genitive. It also has two numbers: singular and plural. How can I change any Modern Greek noun from its Nominative Singular form to its other forms(Accusative, Genitive, Vocative, both Singular and Plural)? There does not seem to be any clear explanation on how to do so. I am also confused on how stress shifts for some words as they decline to their other forms. Please help me ASAP, it's very important for my studies.