ride a horse(骑马)——rode a horse(ride的过去式)
ride a bike(骑车)——rode a bike(ride的过去式)
go camping(去野营)——went camping(go的过去式)
go fishing(去钓鱼)——went fishing(go的过去式)
hurt my foot(腿受伤)——hurt my foot(hurt的过去式和原形一样)
eat fresh food(吃新鲜的食物)——ate freash food(eat的过去式)
go swimming(去游泳)——went swimming(go的过去式)
take pictures(拍照)——took pictures(take的过去式)
buy gifts(买礼物)——bought gifts(buy的过去式)
对比动词的原形和过去式,判断属于规则变化还是不规则变化。