Jisho

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Wikipedia definition
1. Indo-European copulaA feature common to all Indo-European languages is the presence of a verb corresponding to the English verb to be. Though in some languages, such as Russian, it is vestigial, it is present nonetheless in atrophied forms or derivatives.
Read “Indo-European copula” on English Wikipedia
Read “存在動詞” on Japanese Wikipedia
Read “Indo-European copula” on DBpedia

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