Abstract
A detailed study of the complex issue of differentiation and integration of Turkic languages, both in general Turkic and regional plans, is of great interest for Turkic studies.Naturally, when studying the structure of a language, each researcher had his own approach to their study and interpretation.This sometimes makes it difficult to compare studies of different authors, sometimes studies are contradictory.In Turkology, there are still no developed scientific methods for comparative study of large representatives of different genetically independent groups in this case -Kypchak, Oguz and Karluk -which are Kazakh, Turkish and Uzbek languages.In a number of comparative studies existing in Turkology, including in the studies of the phonetic structure of groups of closely related Turkic languages, a scientifically developed unified methodological approach is not always present.Information previously obtained by different authors of research results for different purposes can be characterized as general, inconsistent, fragmentary, which do not represent especially composed essays, built according to a specific plan.The purpose of this characteristic with a brief insight into the processes of the studied languages formation is an attempt to link the current state of the language with their historical process of formation and ongoing development.Historical, ethnic, social, demographic, cultural, administrative, territorial-geographical and other objective factors are undoubtedly decisive, leaving their definite imprints in the language development of the ethnic group.At the same time, deviations in the structure of the studied languages from the Pra-Turkic state find a well-known explanation also in extraordinary situations of history.