play、fly、walk、climb、have、take、teach、study、sing、row的过去式、第三人称单数形式、过去式

应该是过去式 第三人称 和过去分词吧?played plays playedflied flies fliedwalked walks walkedclimbed climbs climbedhad has hadtook takes takentaught teaches taughtstudied studies studiedsing sang sungrow...