Teaching English is not merely delivering the knowledge of it. Teaching
English covers how the material is presented and applied in the real practices. To
realize the idea of teaching English, an English teacher should be able to present
English as both a material and a Medium of Instruction (hereafter is EMI). This
research was aimed at revealing the teachers‟ ways and problems in using EMI
in EFL Classes. This is a case study in which the data from the field was
analyzed descriptively. Four English teachers participated in this research. To
investigate the way of the teachers in using EMI, both observation, and
interview (interview 1 and interview 2) were used. The two interviews provided
a result that all teachers used EMI in the English learning process even though
the use of L1, Bahasa, still occurred. The result of the observation showed that
the teacher implemented different interesting strategies in using EMI. They are
showing the video of English related to the material, giving games, and
providing songs. However, the teachers still found difficulties in implementing
EMI because they can‟t avoid the use of their first language during giving the
instruction. In addition, not all students were able to understand what the
teachers explained using EMI. The last, answering questions from the teachers in
English is still considered difficult for the students.