ㄴ 적 있다

'Have you ever…?'

This asks or states whether something has ever happened in someone's life: 크레이프 케이크 먹어본 적 있어? 'have you ever tried crepe cake?', 로또 당첨된 적 있어? 'have you ever won the lottery?' It usually comes attached to -어 보다 'try doing', giving 먹어본 적 있다 'have had the experience of eating'. Add 으세요 for politeness — 형은 좀 받아보신 적 있으세요? 'have you ever received any?'