A: I would not go to the opera if i were you. It was disappointing.B: Good to know before i wasted my money.빨간 리스닝책 예문인데위 대화에서 B말에 wasted가 왜 과거형으로 되어있나요??대화 시점에서 아직 돈을 낭비하기 전인데요..That's good to know before i waste my money가 되야 할것 같은데요...