A grammatical case is a category of nouns and noun modifiers 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 me/them represent the phenomenon perceived. Here, nominative and accusative are cases, that is, categories of pronouns corresponding to the functions they have in representation.
On this sign in Russian memorializing an anniversary of the city of Balakhna, the word Balakhna (Russian: Балахна) on the right is in the nominative case, whereas the word Balakhne (Russian: Балахне) is in the dative case in Balakhne 500 Let ('Balakhna is 500 years old', literally '[There is] 500 years to Balakhna') on the front of the sign. Furthermore, let is in the genitive (plural) case.
In linguistics, grammatical relations are functional relationships between constituents in a clause. The standard examples of grammatical functions from traditional grammar are subject, direct object, and indirect object. In recent times, the syntactic functions, typified by the traditional categories of subject and object, have assumed an important role in linguistic theorizing, within a variety of approaches ranging from generative grammar to functional and cognitive theories. Many modern theories of grammar are likely to acknowledge numerous further types of grammatical relations. The role of grammatical relations in theories of grammar is greatest in dependency grammars, which tend to posit dozens of distinct grammatical relations. Every head-dependent dependency bears a grammatical function.
Image: Grammatical relations
