some of 后面如果是可数名词,一定用复数,谓语动词用复数.
some of 后面也可以加不可数名词,谓语动词用单数.
one of 后面必须加 可数名词复数,谓语动词用单数.
例如：
Some of the boys are playing football.一些男孩在踢足球.
Some of the bread has gone bad.一些面包已经变质了.
One of the girls is singing .其中一个女孩正在唱歌.