것을 보고

seeing

→ 것

phrase Rare #20,462

seeing 것을 turns an action or description into the object of 보다 (“to see”); 보고 can connect it to what happens next, like “seeing …” or “when … saw …”.

KO: 나는 그가 떠나는 것을 보고 놀랐다.

EN: I was surprised to see him leave.