was good at
definitions
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past tense of being good at; having skill or ability in a particular activity or subject in the pastko: 과거에 특정 활동이나 과목에서 재능이나 능력을 가지고 있었다는 것
examples
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He was good at playing the piano when he was young.
그는 어릴 때 피아노를 연주하는 데 능숙했다.