떠난

In a sentence

• 그는 이미 떠난 후였다.

  He had already left.

  Here, '떠난' functions as the past participle of the verb '떠나다' (to leave), indicating a completed action of leaving.

• 떠난 시간이 기회였다.

  The time spent leaving was an opportunity.

  In this case, '떠난' modifies '시간' to describe the time associated with the act of leaving, providing more specific information.

• 떠난 친구를 그리워한다.

  I miss the friend who left.

  Here, '떠난' serves as an adjective derived from the verb '떠나다', describing the friend who has left.