Why is grammar important for an EFL Teacher?

Grammar is the key for teaching english as a foreign language. If you didn't't know grammar points, you won't teach English. The students will be prepared for speaking and writting, so you as a English Foreign Language Teacher should be able to manage the language for providing to your students the appropriate use of the language. We need grammar structure to express anything that we wanted which activity only we could do it by learning English well. If the EFL Teachers didn't learn well, they wouldn't teach well. Please If you become an EFL Teacher, you learn English well.