The emergence of Turkish as a written language dates back to Old Turkish, according to the sources we have. After Old Turkish, Turkish communities created different written languages in the states they established within the wide geography they spread, and these written languages are generally considered in two groups as Eastern and Western Turkish. Eastern Turkish, which began to be used as a closer continuation of Old Turkish, continued to be used as a common written language from the 13th century to the 20th century, and this written language, which was used for a long time, was later called Chagatai Turkish. Chagatai Turkish, which started towards the end of the 14th century, reached its highest level with Ali Şer Navai and gave way to contemporary Uzbek Turkish towards the 20th century (Ergin, 1992: 211). Chagatai Turkish, which continued as a common written language for a long time towards the beginning of the 20th century, gradually began to give way to new localized written languages bearing the language characteristics of what we call transition period works, as the Turkish communities living in the Turkestan geography began to reflect their own dialect characteristics in writing.
Kyrgyz Turkish, prepositions, Chagatai Turkish