seems to be to have been to had beenseemed to be to have been to had been6가지 모두 무슨 차이에요?원래 제가 알기로는, 본동사가 과거(ed)이든, 현재이든 상관없이본동사와 같은시제면 to be고, 본동사보다 한시제 앞서면 to have been인 줄 알고있었는데어떤 문장에선 to had been도 나오더라구요.혼란스럽습니다.답변부탁드립니다.