some of them是单数还是复数

复数，some是不定代词，可以为修饰用法，也就是后面加名词的用法；可以为指代用法，就是后面不直接加名词的用法。此处是some与of连用型的指代用法，其后既然是them，说明some是指代的复数可数名词的概念，因此为复数概念。

Some of them make him know them.

其中一些让他认识他们。

Some of them are also later sold, in order to limit the number of ponies according to the rules t by Natural England.

根据“自然的英格兰”组织制定的规则，为限制小马的数量，其中一些小马后来也被出售。

Some of them carried the guns which were the tools of their trade.

他们有些人携带着喷枪，那是干他们那一行的器具。

Some of them live in places quite a long way from here.

他们中有些人住的地方离这里很远。

Some of them make no bones about their political views.

他们中的一些人坦率地表达了自己的政治观点。