Grammar is a contentious point. Some argue that it’s horrifyingly appalling that ANYONE would ever utter the words “I drive pretty good”. (This, of course, is because good is an adjective, good is modifying drive, which is a verb, and our forefathers fought and died so that verbs would never be subjugated by adjectives.) Some would even argue that you are a fool, an ill-educated ass, and a corner-dwelling dunce if you managed to emerge from your schooling without learning that periods are properly placed INSIDE of quotation marks.