ABSTRACT Nurainy C, Annisa?un. 2015 : English Students? Code Switching: In The Drive For Optimal Use Of English (A Descriptive Study of 4th Semester English Student of UNIROW Tuban in the Academic Year of 2015/2016) Advisor : Prof. Dr. Agus Wardhono, M.Pd Key word :Code Switching, Classroom Code-Switching, Classroom Code-Switching Function. The puprose of this skripsi are to investigate …