Özet:

In this article, the vowel system of former Chagatai written language has been considered. Some Turkologists have defended that there are 9 vowels in Chagatai by setting out from Navai’s works, and some have defended the being of 6 vowels. We clearly brought up the being of 9 vowels in Chagatai by giving some samples from Navai’s works. The being of 9 vowels in Chagatai’s inheritor today’s Uzbek Turkish too as in Chagatai is obvious. But as a result of Soviet Turkologists’ planned studies, 6 vowels has been accepted as a base in Uzbek instead of 9 vowels in change from Arabic alphabet to Latin alphabet, than 6 vowel phonems had became rule for Uzbek in change to Kiril alphabet. As a result of this alphabet change a chaos has been created by showing the /a/ sound existing general Turkish language in Uzbek as sound /o/. Whereas there are 9 even 10 vowel phonems in today’s Uzbek language as in former Chagatai language

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