가입한

In a sentence

• 그가 필라테스 동호회에 가입한 지 1년이 되었다.

  It's been one year since he joined the pilates club.

  Here, '가입한' is used as part of the grammatical structure to describe the state of having joined or become a member of a group a year ago.

• 내 친구가 최근에 소셜 미디어 플랫폼에 가입한 것 같아.

  It seems my friend recently signed up for a social media platform.

  In this sentence, '가입한' implies the action of registering or subscribing to a platform, occurring recently.

• 가입한 회원들만이 이 특별 할인 혜택을 이용할 수 있다.

  Only members who have signed up can use this special discount offer.

  Here, '가입한' characterizes the specific group of people—those who have completed a signup or registration process.