Case (grammar)
grammatical category whose value reflects the grammatical function performed by a noun or pronoun in a phrase, clause, or sentence / From Wikipedia, the free encyclopedia
In grammar, case changes what a noun, adjective or pronoun does in a sentence. It is a set of forms which depend on the syntax (how the words go together). Case is an example of inflection, which is often an affix, a part of a word that is added to other words, that signals a grammatical relationship. Long ago, Old English used several cases, but Modern English does not use cases except for in pronouns.