so

So is primarily an adverb meaning "thus" or "in the manner indicated": "He is ill and has long been so." This overworked word can also be an adjective (What you say is not so), a pronoun (Be quiet and stay so), a conjunction (Drive slowly so you will not have an accident), and an interjection (So! I've caught you in the act). Two major objections to the use of so are (1) its overuse in statements where therefore, thus, and consequently would serve better and (2) its overuse as an intensive instead of indeed or extremely: "We couldn't go that day, so we sold our tickets" (use therefore or consequently)."After her departure, I felt so sad" (use extremely or some other intensive). So comes to mind "so" easily that everyone tends to overuse it.