VOL. 04 NO. 02, DEC 2022 145 EXPLORING GRAMMATICAL ERROR IN SPEAKING OF STUDENTS UNIVERSITY: A CASE STUDY Yana Karisma 1 , Arif Bulan 2 1 Universitas Teknologi Sumbawa 2 STKIP Yapis Dompu Yana.karisma@uts.ac.id, arifbulan1@gmail.com First Received: November 11, 2022 Final Proof Received: December 30, 2022 Abstract Researchers feel it is important to conduct research on grammatical errors in students, it is based on mistakes made by students when speaking. In addition, based on previous relevant research, there are still gaps. This study aims to analyse the types of grammatical errors that occur in students of the English education study program STKIP Yapis Dompu. The research method used in this study is qualitative research with a descriptive case study approach. The results of this study indicate that there are four errors encountered in the speaking of students of the STKIP Yapis Dompu English Education Study Program, namely omission, addition, misformation, and misordering. Omission consists of five errors; addition consists of four errors. misformation consists of three errors and misordering consists of two errors. Thus, the grammatical errors found in students of the English Education Study Program STKIP Yapis Dompu are only limited to the four types mentioned above. Keywords: Error, Grammar, Speaking. INTRODUCTION In some campuses that organize English education study programs, it is mandatory to have speaking courses. Speaking itself is one of the four skills in English. All of these skills are equally important (Widodo, Fang, & Elyas, 2022), speaking is an energetic system of sharing the thoughts, opinion, which means and feeling which entails the audio system (Naskah, Refnaldi, & Syafei, 2018). Speaking is one of the skills that must be possessed by students in order to achieve effectiveness in communicating (Helmanda, Safura, & Suriadi, 2018) So that these skills must be held by a campus that has an English education study program. Speaking according to some experts is a skill that is quite difficult (Nikmah & Anwar, 2021). But even though it is difficult this skill is also very interesting for some people who learn it (Anggana, 2018; Lestari, Muljanto, & Lestari, 2020). For students at STKIP Yapis Dompu, based on the results of initial interviews, speaking is a favorite subject because the majority of students think that speaking is a symbol of learning English itself. So that the speaking course is in great demand by many students of the English education study program at STKIP Yapis Dompu although other courses are also in demand by many students. Thus, speaking subject is an interesting object to study. Speaking problems are very interesting to discuss (Kirkpatrick, 2007; Nurhayati, Hendrawaty, & Angkarini, 2013; Vinhas, Darmawan, & Syamsiah, 2018), because there are still many things that need to be researched, especially regarding errors in pronunciation (Ellis & Gary, 2005). Speaking in an improper grammatical way by the students involved in the error category in language production (Vinhas et al., 2018). There are several categories of