którego

którego is the genitive singular form of the Polish relative pronoun który. It is used when introducing a relative clause and when the antecedent is masculine or neuter singular. In this role it functions similarly to other relative pronouns in Polish, connecting the noun phrase to information that follows.

In addition to its use in relative clauses, którego may appear in interrogative constructions requiring the genitive case, such as questions about choice within a group. For example: Nie wiem, którego z was wybrałeś. This means “I don’t know which of you you chose,” with którego signaling the genitive masculine/neuter form and z was indicating a partitive or collective reference.

Its forms vary by gender and number. Genitive singular masculine and neuter is którego, genitive singular feminine is której, and genitive plural is których. The nominative forms, by contrast, are który (masculine), która (feminine), and które (neuter), with sensitive agreement in the relative clause.

Usage notes: którego is most common in written Polish and formal speech, where precise gender agreement and case marking aid clarity in complex clauses. In everyday spoken language, speakers may substitute different constructions or use całe forms of other relative pronouns, depending on regional or stylistic preferences.

Etymology and relation to other forms: które forms derive from the same root as the base interrogative/pronoun który, sharing the same inflectional paradigm. Together with które, której, and których, które together comprise the full set of genitive and non-genitive forms necessary for constructing relative clauses and certain interrogatives.