Vocative case

Grammatical case for noun addressed

In grammar, the vocative case is a grammatical case which is used for a noun that identifies a person being addressed or occasionally for the noun modifiers of that noun. A vocative expression is an expression of direct address by which the identity of the party spoken to is set forth expressly within a sentence. For example, in the sentence "I don't know, John," John is a vocative expression that indicates the party being addressed, as opposed to the sentence "I don't know John", in which "John" is the direct object of the verb "know".

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