때렸던

In a sentence

• 나는 어릴 때 나쁜 친구를 때렸던 기억이 나.

  I remember how I hit a bad friend when I was young.

  In this sentence, '때렸던' (hit) is a past action used as an adjective to describe '기억' (memory). It shows the memory of an action that happened in the past.

• 그가 때렸던 사람이 아직도 화가 나 있다.

  The person he hit is still angry.

  Here, '때렸던' (hit) is used as a past participle to describe '사람' (person), indicating the person who was hit by '그' (he).

• 전에 때렸던 공이 너무 멀리 갔다.

  The ball I hit earlier went too far.

  In this sentence, '때렸던' (hit) functions as a descriptor of '공' (ball), referring to the ball that was hit previously in the past.