번역:I talked to them previously.
I told them in advance 안되나요?
I told them previously 안되나요
I have already told them 은 안되는지 모르겠네요.
I previously talked to them
I have told them previously는 왜 안돼요?
I told them already. 는 안돼나요?
previously : 미리
already : 이미
"I told them in advance" should be accepted as well.