While the reasons that cause the students used code mixing were talking about certain topics, quoting others, be firm about something (express solidarity), interjection (inserting sentence filler or sentence conjunction), repetition is used for communication, intention to clarify speech content or speech, expressing group identity. The factors of students doing code mixing were participation roles and relationship, situational factor, message intrinsic factor, and language attitude, dominance attitude, and security attitude factors.
The types of code mixing used by students were morphemes, word, modifiers, phrase, clause, sentences. The result showed all 2 nd grade students of XI MIPA 4 used code mixing. To obtain the data observation, questionnaire, and interview were employed. This research intends to analysis the types of code-mixing in Banten employed by 2nd grade students of SMA N 2 Kota Serang, to know the factors of students used code-mixing, to know the reasons of students used code-mixing.
