Used to indicate ability or permission in the past.
예문
1. I could have danced for joy. (기뻐서 덩실덩실 춤을 추고 싶었다) 2. I could have done it if I had wanted to. (하려고 마음 먹었으면 할 수 있었을 텐데) 3. Could I borrow your pen? (펜 좀 빌려도 되겠습니까) 4. I would have made a note if only I could have found a pencil. (연필을 발견할 수 있었더라면 쪽지를 써 놓았을 텐데) 5. The report couldn't be true. (그 보고는 정말일 리가 없다)
