cattle能不能加s

cattle能不能加s millions of cattle 为什么million加s cattle 不加 tow head of cattle 中的 head要加s吗five head of cattle 五头牛 对吗 two head of cattle,head要加s吗?可是为什么ten head of cattle 又不用加s? he was devastated,for all his cattle were lost in the catastrophe为什么cattle不加s却用were Mr Smith bought twenty more head of cattle.这里的head 是否加s American能不能加s “America”能不能加“s”? Start能不能加s list能不能加s cattle问题cattle是一个怎么样的词?按照常理来说.如10 cups of milk.数词为复数时,量词cup也应该是复数啊.为什么是10 head of cattle.head不加s? people,cattle,police加 is 还是are? with能不能加s 为什么 holiday后面能不能加s? five head of cattle 还是 five heads of cattlefive head of cattle中head 加不加s? 英语中不可数名词能不能加s? 不可数名词能不能加S举例 yuan能不能加s,为什么?急!