这里为什么用good manners 而不用a good manner?
问题描述：
这里为什么用good manners 而不用a good manner?
before entering a house in some Asian countries,it is good manners to take off your shoes.
答
manners :礼貌,常用复数.
用单数则表示“方法”、“方式”（与介词in并用）.如：You should handle the problem in a careful manner.