appear and, appear, soThe -아서 form connects this verb to a following action or result, often meaning “appear and…” or “because it appears…,” depending on context.
KO: 갑자기 화면에 오류 메시지가 나타나서 컴퓨터를 다시 시작했어요.
EN: An error message suddenly appeared on the screen, so I restarted the computer.