A : I have no confidence in myself. - 자신이 없어요. B : What's up? - 무슨 일인데요? A : I got a D in mathematics. - 수학에서 D를 받았어요. B : Cheer up! I'm sure you'll do well next time. - 힘내요! 다음번엔 잘 할 거예요.