This thesis is the research about an error analysis in using passive voice (A Case Study of the Second Grade Students of MAS Guppi Buntu Barana in Academic Year 2014/2015). The objectives of research are: 1) to identify kinds of errors made by the second grade students of MAS Guppi Buntu Barana in using passive voice. 2) to identify the most dominant errors made by the second grade student…