I am not a native American but I can say that I have a good command of English language. Since it is one of the most common languages in the world, we can fairly say that it is extremely important that learning English grammar is imperative, especially if you are trying to get a good. In my country alone, most interviews are done using this language and if you cannot express yourself well, you will most likely do not get the job you are applying for. In my current job, I probably won't make it if I have poor grammar and little understanding of the English language. It is a big help actually, since I earn even if I am only staying at home. How about you, what is the importance of having good grammar to you?