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SRI DEVA, 2317.008. “AN ANALYSIS OF STUDENTS’ ERRORS PASSIVE VOICE IN CLASS XI SMK SWASTA PEMBINA BANGSA” a thesis. English Education Study Program, UIN Sjech M. Djamil Djambek Bukittinggi,2022. This research was done because the researcher found several problems faced by the eleventh grade students of SMK Swasta Pembina Bangsa in making passive sentences. Based on preliminary research with some students and English teacher, the facts show that students difficult to apply passive voice patterns into different tenses, some students difficult to distinguish between active and passive voice because they lack strategies and less of practice outside the classroom, some students difficult to understand and unable to make passive sentences because they do not really master the aspects of grammar needed to make the correct passive tenses. Based on the problems above, the researcher conducted the research to find out the types of students' errors in making passive voice, and what cause the students’ errors in making passive voice. The researcher used a mixed research design. The population in this research was the eleven grade students of SMK Swasta Pembina Bangsa consist of five classes; the sample was in class students of hotel accommodation program and accounting which was taken by using cluster random sampling the researcher used test and interview in collecting the data. In analyzing the data, the researcher uses formula to find out the percentage of the data that has been collected through test and interview. The research findings shows that the students made some errors in making passive voice. There are 4 types of errors were identified, they are omission, addition, misformation, and misordering. Based on the formula which was used, the researcher found the percentage of students’ error. The total of error is 496 errors which classified into 4 types: omission is 62 cases (12,5%), addition is 116 cases (23,38%), misformation is 155 cases (31, 25%), and misordering 163 cases (32,86%). These errors are caused by some factors, that are interlingual transfer and intralingual transfer. Hence, many students get errors in making passive voice related to some items which are caused by some factors.