Abstrak
GHINA HANIFAH, NIM. 2030104023. Thesis title “Student Errors in Using Adjective Clauses at UIN Mahmud Yunus Batusangkar (Study of 4th Semester Students for Academic Year 2024)”. English Tadris study program, Faculty of Tarbiyah and Teacher Training, State Islamic University (UIN) Mahmud Yunus Batusangkar. The problem in this research is that there is a tendency for students to make errors when using adjective clauses in fourth semester student of English Teaching Departmen at UIN Mahmud Yunus Batusangkar The aim of this research are to find out what errors make by students in using adjective clauses and to find out what types of errors in using adjective clauses. This research used a quantitative descriptive approach. In collecting data,the researcher used a cross-sectional design method. The sample for this research was 46 of the students of English Teaching Department registered in 2023/2023 academic year . The sample was selected from the entire population. In collecting data, researcher used students' final exam results in the Advanced Grammar course. The students' final exam consisted of three packages and the researcher only took part B of the exam which tested adjective clauses which consisted of ten questions. In this research, researcher used document as a technique for collecting data. The procedure for collecting and processing this data uses three steps, namely preparation, operation, and post operation. Data analysis is carried out by classifying the data, rotating the data, explaining the data, then concluding the data using a conclusion presentation. The results of this research show that there are some errors made by students in using adjective clause, they are which (41 or 32.28%). It mean that error use which were low. Second whom (25 or 19.68%), third whose (23 or 18.1%). Furthermore, the use of the adjective clause where (18 or 14.18). Next is Who (11 or 8.66), and finally the part of the adjective clause used incorrectly does not match its function by students is when (9 or 7.1%). These all error included whom, whose, where, who, and when were stongly low. Then types of errors that occured misformation (126 or 32.23%), misordering (119 or 30.44%). Its mean that misformation and misoerdering errors were low category. Next, addition (88 or 22.5%), and omission (58 or 14.83%).These errors in strongly low category.