there are 10 boys,5 of them boys这句话是对的怎么解释

问题描述:

there are 10 boys,5 of them boys这句话是对的怎么解释
rt

是对的 后面是独立主格形式 ,5 of them boys(独立主格).=,5 of whom are boys.(定语从句)
是不是前一个boys 打错了?