The document discusses case systems in languages such as Australian Pitta-Pitta and Latin. It provides examples of how case is marked in these languages through suffixes added to nouns. In Pitta-Pitta, suffixes indicate the grammatical relationship of nouns to verbs and other nouns. In Latin, case is marked through suffixes for number, gender, and grammatical role. While English has lost most of its case system, it retains some forms like possessive 's and pronominal distinctions between nominative and oblique forms.