stay stayed 直接加-ed 呆在see saw 特殊的 看见visit visited 直接加-ed 拜访study studied 以辅音字母加-y结尾的变y为i加ed 学习dance danced 以e结尾的直接加d 跳舞stop stopped 双写尾字母加ed 停止am was 特殊...