For questions about grammatical cases (nominative, genitive, dative, accusative, ablative and vocative). Consider also using the tags 'declension' and 'morphologia'.
Latin has an extensive inflection system for nouns, called "Declension". Generally, a noun is declined into six cases (nominative, genitive, dative, accusative, ablative and vocative), and two numbers (single and plural). A few nouns have two additional cases (locative and instrumental).
