This document discusses speech acts theory, elaborating on the different types of speech acts as defined by J.L. Austin and J.R. Searle, including locutionary, illocutionary, and perlocutionary acts. It also covers the practical implications of these speech acts in teaching English as a foreign language, particularly in an Indonesian context, highlighting how the classification of speech acts affects classroom communication and student comprehension. The findings indicate that directive speech acts are most frequently used by teachers, correlating with student engagement and achievement in productive language skills.