Should an english teacher speak english all the time?

If you are native speaker? Yes, you can but if not you're going crazy. Ngajar bahasa Inggris dengan jumlah siswa 20 orang ngomong bahasa inggris terus, coba aja ndiri. I have been an English teacher for more than 5,year . That statement isn,t right enough. Sometimes I speak Indonesian sometimes I speak English . That,s the real situation in a classroom.