The vocative case in Korean is commonly used with first names in casual situations.
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Pronouns were declined similarly, although without a separate vocative form.
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The vocative case in Irish operates in a similar fashion to Scottish Gaelic.
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In Gaelic, the vocative case causes lenition of the initial letter of names.
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Ukrainian is the only modern East Slavic language which preserves the vocative case.
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Manx has the vocative case, at least to the extent of initial lenition, as has Welsh.
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The vocative case is used to address someone or something in direct speech.
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All neuter nouns have identical forms across the nominative, accusative and vocative.
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A few words have an ending that marks the word as a locative or vocative.
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More examples
Relating to a case used in some languages; "vocative verb endings"
The case (in some inflected languages) used when the referent of the noun is being addressed
The vocative case (abbreviated) is the case used for a noun identifying the person (animal, object, etc.) being addressed and/or occasionally the determiners of that noun. ...
In a synthetic or declined language, a grammatical case used to invoke or call to another person.
A vocative expression is one which is used to address one or more individuals, and which is set off in a separate tone-group at the beginning or end of the sentence (marked in the spelling by the use of a comma). So, for example, Fred is a vocative expression in 'Fred, can you give me a hand? ...
One of the six cases in Latin. It's the form a word has when it's being directly addressed, as in Ave, Caesar, hail Caesar. It had nearly disappeared as an identifiable form of the noun by the classical period, being almost always the same as the nominative case of the noun. ...