Why is grammar important for an EFL teacher?

English as a Foreign is used when people learn English in a non-English speaking country. Grammar is very imporant for EFL teachers because it is the language that makes it possible to talk with the students and foreingners. Grammar makes better communications, listener, speaker. reader, writer and better professor. Grammar is absolutly important in this language and if EFL teacher doesn't know this rules and the correct form, he doesn't speak very well and the students don't understand his explanation.