Crow has some bread是小学五年级书上.bread为什么不用复数

bread 是不可数名词,没有复数. some可修饰可数不可数名词.不可数名词可加量词量化谓语动词可变复数：
例：...a loaf of bread.
…一条面包
two loaves of bread "两条面包"后谓语动词用复数"Two loaves of bead are given by Jake.