The article discusses the origin of auxiliary words and their division into lexical-semantic groups based on the meanings belonging to these words. It also discusses the role of spelling principles in writing auxiliary words; thus, the article focuses on the spelling of auxiliary words. In this respect, it is mentioned about the difficulties in spelling certain auxiliary words, despite the established spelling norms. The author refers to the fundamental works of renowned Turkologists in the field of grammar, and supports his arguments with examples taken from modern dictionaries on orthography. Evolutionary changes in a number of auxiliary words are highlighted. The main purpose of the article is a comprehensive analysis of auxiliary words and syllables, identifying problems associated with the spelling of these linguistic units and providing ways to solve them. Therefore, when writing the article, the author provides References to the fundamental works of famous Turkic scholars published in the field of grammar on each statement, relies on dictionary materials and argues his opinion. By describing the historical background of auxiliary names as auxiliary words and determining their grammatical and lexical meanings, their function in the language has been described. An overview of the differences between conjunctions in Kazakh linguistics and Turkology has also been shown,