On Ali-Shir Navai and Nowadays Uzbek Language’s Vowels

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.