His grandpa is over seventy.but he is still at good healthy哪错啦?
问题描述：
His grandpa is over seventy.but he is still at good healthy哪错啦?
答
good healthy错了 good是形容词，后面应该加名词，而 healthy是形容词，应该是 health
答
His grandpa is over seventy.but he is still in good health.