Analysis of information sources in references of the Wikipedia article "Singular they" in Hebrew language version.
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Like singular you, singular they is treated as a grammatical plural and takes a plural verb.
... our pronoun they was originally borrowed into English from the Scandinavian language family ... and since then has been doing useful service in English as the morphosyntactically plural but singular-antecedent-permitting gender-neutral pronoun known to linguists as singular they.