Used to indicate ability or permission in the past.
예문
1. He asked me if he could go home. (그는 집에 돌아가도 좋으냐고 내게 물었다) 2. You could have told me! (말해 주었더라면 좋았을 텐데) 3. I could have done it if I had wanted to. (하려고 마음 먹었으면 할 수 있었을 텐데) 4. Could you come and see me tomorrow? (내일 만나러 와 주시겠습니까) 5. He said he could swim. (수영할 수 있다고 그는 말했다)
