case
Also known as grammatical case, grammar case
categorization of nouns and modifiers by function
AI overview
"Case" is a grammatical system that marks how nouns and modifiers function in a sentence—for example, whether they're the subject performing an action, the object receiving an action, or showing possession. It matters because many languages use case endings or changes to signal these relationships, which helps readers and listeners understand who is doing what to whom.
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Article
A grammatical case is a category of nouns and noun modifiers (determiners, adjectives, participles, and numerals) that corresponds to one or more potential grammatical functions for a nominal group in a wording. In various languages, nominal groups consisting of a noun and its modifiers belong to one of a few such categories. For instance, in English, one says I see them and they see me: the nominative pronouns I / they represent the perceiver, and the accusative pronouns them/me represent the phenomenon perceived. Here, nominative and accusative are cases, that is, categories of pronouns corresponding to the functions they have in representation.
English has largely lost its inflected case system but personal pronouns still have three cases, which are simplified forms of the nominative, accusative (including functions formerly handled by the dative), and genitive cases. They are used with personal pronouns: subjective case (I, you, he, she, it, we, they, who, whoever), objective case (me, you, him, her, it, us, them, whom, whomever), and possessive case (my, mine; your, yours; his; her, hers; its; our, ours; their, theirs; whose; whosever). Forms such as I, he, and we are used for the subject ("I kicked John"), and forms such as me, him, and us are used for the object ("John kicked me").