為什麼這裡要用 "been"?

母語人士的回答
Rebecca
這裡用 "been" 是表達過去的可能性。"could have been" 就是 "could have" 加 "to be" 的意思。 例句: That could have been the first time I saw a shark! (那可能是我第一次看到鯊魚!) 例句: You could have been first but instead you got last place. (你原本可以是第一名,但你卻拿到了最後一名。)