Learning proper English is important. It's the difference between the phrases "Let's eat, grandma." and "Let's eat grandma." If you want to make sure the grandmothers of the world remain tooth-mark free, consider becoming an English teacher. English teachers prepare and educate students for the world. Primarily in middle, high schools and post-secondary schools, English teachers teach grammar, reading comprehension, writing, and understanding of books and other writings.
English teachers create lesson plans and teach those plans to the entire class, individually to students or in small groups, track student progress and present the information to parents, create tests, create and reinforce classroom rules, work with school administration prepare students for standardized tests, and manage students outside the classroom, such as in school hallways, detention, etc