Abstract
The creation and approval of a writing system on a national basis is the most important prerequisite that serves as support for preserving the national character and uniqueness of the language. The writing system formed by the first reformer of the Kazakh script A. Baitursynuly is also highly appreciated from this point of view. Since the issue of spelling is always relevant, it is extremely necessary for Kazakh linguistics to determine the main provisions of the spelling rules that formed the basis for the spelling reform of the scholar. The article analyzes the rules of spelling – the integration of the principles of writing and grammatical patterns, which for the first time were fully reflected in the work "Til-Kural". The purpose of the study is to identify the relationship between spelling rules and grammatical problems formulated by A. Baitursynuly. The practical significance of the study is manifested in the analysis of the importance of substantiating the grammatical position in the construction of spelling rules. The paper makes comparisons in diachronic and synchronous aspects and examines the nature of the development of the spelling of the Kazakh language in texts of the XVIII, and XIX centuries and the reflection of grammatical units in writing. In particular, based on the methods of comparison, description, and systematization, historical data were demonstrated, including the reason for the violation of grammatical patterns in the materials of the ancient Kazakh written language and its influence on writing. As a result, in the work, the connection of morphological rules with spelling was classified into three different groups: "Word form and spelling", "Word composition and spelling", and "Punctuation and spelling".