Özet:

Various words that have survived through the historical texts of Turkish and have changed over time contain many phonetic changes. It is not always easy to determine the historical background of sound events. Their determination is perhaps one of the most important issues of Turkish grammar. From this point of view, it can be said that answering the questions about how the sound events occurred in these texts, how they reached the present day and what stages they went through, and determining the history of these changes are very valuable for the Turkish language. In the historical periods of Turkish, the phoneme /g/, which differs at the beginning, within, and end of the word undoubtedly played a very important role in the development process of the Turkish language and even in the classification of today's dialects. In this study, it has been tried to reveal how and in what way /g/ sound has changed to /v/ or dropped in the historical process, based on the historical texts of Turkish and also by including the opinions of Turcologists. While the change of the sound to / v / was an indirect process, the / ğ / sound easily transformed into the / v / sound, and the change of the sound / y / to / v / occurred rarely. It was observed that the / y / sound tended to decrease more.

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