Hi Abm, ~해본 적이 있다 (or ~해본 적 있다 in a short form) = to have done something It is used when talking about someone's 'experience'. Ex.1) A: 전통문화 체험을 해본 적 있어요? (= Have you ever tried traditional and cultural activities?) B: 네, 작년 겨울에 서울에서 '김치 담그기 체험' 해봤어요. (= Yes, I have tried 'the Kimchi-making activity' held in Seoul last winter.) Ex.2) A: 한국에 가본 적 있어요? (= Have you been to Korea?) B: 아니요. 한번도 안가봤어요. 여행갈 만해요? (= No, I have never been there. Is it worth travelling there?) Hope it helps.