what color are their hair?hair加不加s

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whatcoloraretheirhair?hair加不加swhatcoloraretheirhair?hair加不加swhatcoloraretheirhair?hair加不加s不用加s,因为hai

what color are their hair?hair加不加s
what color are their hair?hair加不加s

what color are their hair?hair加不加s
不用加s,因为hair(指头发时)本身为不可数名词
所以可以直接表述为:What color are their hair?(翻译是:他们头发颜色是?)
【南湖湖畔】团队荣幸为您解答

当译作头发,毛发时是不可数名词,不用加s的

不加。
hair作为可数名词,是指一根一根的“头发”或“毛发”;作为不可数名词“头发”的总称,是集合名词。

hair指整体时,为不可数名词,故不加s。但如果要特指头上或身上的某一缕或几缕毛发,就取可数名词。如
He has a few white hairs.

hair指整体时,为不可数名词,故不加s

问题是 本句 谓语 用的是 复数形式are
所以我认为 主语应加s 指不同人的头发
试问 不可数名词 作主语 谓语 能用复数形式吗?