추천한

In a sentence

• 그 책은 내가 추천한 것이었어요.

  That book was the one I recommended.

  In this sentence, '추천한' modifies '것이었어요' to denote the object that was recommended by the speaker.

• 친구가 추천한 식당에 가보았어요.

  I visited the restaurant my friend recommended.

  Here, '추천한' is used to describe '식당,' indicating the restaurant that was suggested by a friend.

• 교수님이 추천한 논문을 읽어 보았습니다.

  I read the paper recommended by the professor.

  In this instance, '추천한' qualifies '논문,' signifying the paper that was endorsed by the professor.