THE "UNSTABLE" SOUND [N] IN TURKIC AND MONGOLIAN LANGUAGES
The theory of the «Altaic language family» is based on the sound parallels between the Altai languages. The sound parallels are considered to be the most important aspect of linguistic kinship in the Comparative-Typological Studies. Since the sound parallels exist in numerous examples in the discussed languages and according to the laws of probability, these examples of sound parallels eliminate the doubts of genetic affinity of the Altaic languages. The theory of sound parallels in the Altaic languages were discovered by G. Ramstedt, Z. Gomboch, and N. Poppe. Their theories were the basis for the hypotheses of the many other scholars. This research studies the «unstable» sound [n] that exists in Turkic (in Kyrgyz and Turkish) ​​and Mongolian languages. Isomorphism in the sound structure of the Turkic and Mongolian languages has been studied in the works of S.G. Clauson and T. Tekin. They examined the chronology of existence of sound parallels in the compared languages. S.G. Clauson believes that the borrowing of Turkic words in the Mongolian languages was realized in three stages from ancient times until the 16th century. The scholars confirm their theory on the basis of data analysis and propose a hypothesis related to the «unstable» sound [n]. The «unstable» [n] «sound appeared at the end of the borrowed Turkic words. An unstable sound [n] could appear at the beginning of the Middle Mongolian». However, the very existence of this «unstable» sound [n] in the Turkic languages – complicates the approval of the above hypothesis. In Turkic languages, the «unstable» [n] at the end of the word has disappeared in many cases, but there are facts of its preservation in some words. In the historical stages of Mongolian languages, the «unstable» [n] has long been preserved, but this sound is being lost in modern Mongolian languages.