Keywords: Ossetian language, Iron dialect, Digoron dialect, Old Iranian languages, verb, preverb

The article investigates the problem of the origin of Ossetian verb by comparative analysis of past and present tense verb stems in Iron and Digoron dialects, as well as Old Iranian languages. To a detailed analysis is subjected the system of preverbs, which perform species-generating functions, have the meaning of completed action and possess similarities to the verbal systems of other Iranian languages.