"니가 그렸니?" "니가 그렸어?" "네가 그렸니?" "네가 그렸어?" - Theses are used among close friends or to the younger than you are. (plain speech) "당신이 그렸어요?" (informal polite speech, most commonly used speech style to be polite) "당신이 그렸습니까?" (formal polite speech, commonly used among colleagues at work)