Unchangeable Part of Speech in Modern Turkic Languages: Semantic and Function

The article concerns such a disputable problem as adverbs as an unchangeable part of speech in Turkic languages. The work presents a profound research of scientific labors of a number of eminent linguists, their viewpoints, methods and approaches to the subject of adverb transformation into an integral and constituent part of a word. The author supplies his study with numerous examples from the old Turkic, Yakut, Bashkir and Kazakh languages. The examples illustrate common and peculiar features of adverbs in different language phenomenon. In the course of comparative investigation the author draws a few considerable conclusions and principles.