AbstractThe objectives of this study are to investigate sorts of error on subject-verb agreement encountered in theses, the error frequency of subject-verb agreement, and the causes of errors of subject-verb agreement. Written language production is the major requirement of a thesis writing. However, sentence types necessarily become the starting points of determination to the correct subject-verb agreement. The research applied a descriptive method with qualitative approach. The data of this research were collected from the corpus of 6 theses submitted to English Language Study Program in Academic Year 2017/2018. The data were manually sorted out by separating subject-verb agreement errors from other types of error. The result showed that there are 6 major forms of subject-verb agreement which comprised 170 errors. Of 6 forms, “3rd singular subject†was the most frequent encountered in theses. In contrast, “double subject†was the least frequent error form. The errors were caused by “interlingual errors†and “intralingual errorsâ€. Keywords: Errors, Subject-verb Agreement, Theses
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