1앞과 뒤.front and back; forward and backward direction
2먼저와 나중.the time before and after; situation; context
3앞말과 뒷말.context; earlier and later statements
길을 건널 때는 앞뒤를 잘 살피며 조심스럽게 걸어요.When crossing the street, I walk carefully looking closely at the front and back.