common grammatical errors in students‟ writing at MAN 1 Parepare in Academic Year 2013/2014,

This research was designed for a descriptive quantitative research. There were two variables in this research. They were common grammatical errors in students‟ writing and grammatical error comparison among students based on their class level. The population of this research was 141 students that consisted of three levels of classes, namely class X, XI, and XII. Class X consisted of 54 students, class XI consisted of 47 students, and class XII consisted of 40 students. The samples were taken by random technique. There were 30 samples in which each class level was represented by 10 students. The instrument of this research was a writing test. This research used percentage technique to analyze the data. The results of this research showed that (1) From nine types of grammatical errors provided by La Trobe University Handout, there were three types which became the common grammatical errors made by the students in MAN 1 Parepare in academic year 2013/2014. They were singular-plural noun with 39 items (13.31%), vocabulary with 39 items (13.31%), and sentence structure with 39 items (13.31%), (2) Each class level in MAN 1 Parepare in academic year 2013/2014 had different percentage of grammatical errors. Class X made 139 errors or (47.44%). Class XI made 93 errors or (31.74%). Class XII made 61 errors or (20.82%). It showed that the higher class of the students in MAN 1 Parepare, the fewer grammatical errors that they made in their writing test. Key words: Errors, Grammar, Analysis, Writin