This article investigates the development of the word /jaŋ/ from the Sukhothai period right up until the present time using grammaticalization theory. Findings indicate that the historical development of /jaŋ/ has two main pathways: (1) the lexical... verb /jaŋ/ meaning “to exist” as the original word, and then developed into three grammatical words which are the auxiliary, conjunction, and causative marker, and (2) the transition from the lexical verb /jaŋ/ meaning “to stay

The study aims to investigate word classes, functions and contexts of the word /bon/ in Thai, along with its meanings and concepts as well as processes and mechanisms of semantic change and development from Sukhothai period to the reign of King Rama... IX of Rattanakosin period (2016 A.D.), using cognitive semantics, grammaticalization, and lexicalization as conceptual frameworks. There were 2,441 tokens of the word /bon/ in total, according to this study. It was found that, firstly, the word /bon