The purpose of this study is to analyze syntactic structures on the relative clause and errors in writing relative clause. The type of research used is descriptive qualitative. The population of this research was the sixth semester students of the English Department consisting of 143 students. The researcher took 20% population. The sample was selected through random sampling techniques and the researchers took 28 samples. The data were collected using documentation. The result shows that there were many relative clauses and errors in writing the relative clause. There are 24 relative clauses in class A, 37 relative clauses in class B, 20 relative clauses in class C and 27 relative clauses in class D that represented by parsing diagram. Students also make errors in writing relative clauses where there are 4 types of errors made by students in a relative clause. The types of errors are omission error, addition error, regularization error, and misordering. The students made 39 omission errors, 1 addition error, 21 regularization errors and 8 misordering. Thus, it can be concluded that there are 108 relative clauses that analyzed by parsing diagram and the total errors who made by students of the sixth semester of the English Department of IAIN Bukittinggi is 69 errors in relative clause. Based on David P. Harris theory, 69 is fair level so that students' understanding of the relative clause is fair.
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