Another issue is that language teachers have been trained to teach linguistic knowledge rather than a content subject. Hence, language teachers “may be insufficiently grounded to teach subject matters .” Indeed, language teacher have not been trained to teach content subjects, and may be questioned about their credibility in CBI courses. From my perspective , I would say that language teachers can ask for assistance from content teachers. Additionally, language teachers can choose a content subject that they are familiar with to instruct. Do not try to teach all subject matters, that is, language teachers should start small. Finally, language teachers can attend professional development workshops to let themselves have second, third , or even fourth profession.