Tvoj

Tvoj is a possessive determiner used in several South Slavic languages to mean "your" in informal address. It is common in Croatian, Serbian, Bosnian, Montenegrin, and Slovenian, where it accompanies a noun and agrees with its gender and number. In informal speech, tvoj marks ownership by the second person singular; in formal or polite contexts, a different form such as vaš/vaše/vaša is typically used.

In usage, tvoj precedes the noun it modifies, as in tvoj auto (your car) or tvoja kuća (your house). The form inflects for gender and number to match the noun, following the same pattern as other possessive adjectives in these languages. The exact endings vary by language and dialect, but the general principle is agreement with the noun rather than a fixed standalone form.

Etymology and cognates trace tvoj to the Proto-Slavic possessive adjective system, shared across many Slavic languages. It is closely related to the demonstrative pronoun system and is cognate with Russian tvoy, among others, reflecting a common Slavic heritage for second-person possessives.

Notes and cross-linguistic variation: While tvoj functions as the informal second-person possessive in the mentioned languages, usage can differ in formality, dialect, and standard versus colloquial registers. In Slovenian, as in Croatian, the distinction between informal tvoj and formal forms is part of a broader social usage pattern in address and written language.