Code Mixing In the Classroom Interaction of SMKN 7 Medan

The objective of this study is to find out the type of code-mixing used by the
teacher and students and the factors causing the teacher and students mix the
language in classroom interaction. Code-mixing is a bilingualism phenomenon
which has become very popular in society. It is used to prevent misunderstanding
such the teacher and students in classroom interaction. This study was conducted
by using descriptive qualitative design. The subjects of this study were the teacher
and students from tenth grade of hotel accommodation in SMKN 7 Medan. The
data were collected by recording the teacher and students’ utterances in classroom
interaction, the interview result of teacher and questionnaire of students. From the
research, it was found the type of code-mixing used by the teacher and students
were word insertion, phrase insertion, and clause insertion. All of data belongs to
outer code-mixing and the factors causing teacher did the code-mixing were
speaker partner, bilingual or multilingual, and absence of vocabulary. And for the
students, according to the percentages of their questionnaire result the data shows
that out of 24 students 45,8% of them chose speaker partner as their reason did the
code mixing, 8,3% chose bilingual or multilingual, and 45,9% chose absence of
vocabulary.