Abstract :
This research aimed to find out the common types of errors committed by the
eleventh grades students of SMAN 1 Porong. Theoretically, this research intended
to identify, classify, and explain the types of errors made by the students. In
addition, this research aimed to find out the highest frequency of errors that had
been found on analytical exposition written text made by the students. The
method utilized in this research was descriptive qualitative research. The subject
was 15 students of the eleventh grades students in SMAN 1 Porong. The data
were collected by instructing the students to write analytical exposition text. The
errors were classified using the theoretical of Dulay?s surface strategy taxonomy
including omission, addition, misformation, and misordering. By analyzing the
students? analytical exposition written text, the total number of errors was 85
errors. The students committed error in all types: 30 omissions (35%), 21 addition
(25%), 22 misformation (26%), and 12 misordering (14%). Hence, the highest
frequency of errors on students? analytical exposition written text is omission with
30 errors (35%). The frequency of students? error happened because the students
did not know well about the grammar or English structure rules that should be
used in a sentence. Based on the findings and discussions of the result, the
conclusion was many students still faced difficulties in the English structure rules.
Due to the result of this research, the students needed to learn more about
grammar to enhance their knowledge and decrease their errors in writing.