This chapter explores the structure and pragmatic functions of interrogative and exclamatory expressions in the Thai language, offering a comprehensive analysis of how questions and emotional expressions are formed, used, and interpreted in different contexts. The chapter categorizes interrogative sentences into yes-no questions, tag questions, Wh-questions, and alternative questions, highlighting their syntactic patterns, tonal cues, and the use of particles. It emphasizes the flexible sentence structures in Thai, including subject omission and word-order variation, and examines how verb-assisted words and auxiliary markers contribute to aspectual and temporal meanings in questions. The chapter also delves into exclamatory expressions that convey emotions such as surprise, emphasis, or frustration, demonstrating how these are expressed through tone, particles, and sentence-final elements. Through extensive examples and comparative frameworks, this chapter equips readers with the tools to formulate and interpret questions and exclamations accurately, enhancing both communicative competence and cultural understanding in Thai.