There are some (is) right, but some are wrong, 为什么前面用is(括号里的is)而不是are,求解

问题描述:

There are some (is) right, but some are wrong, 为什么前面用is(括号里的is)而不是are,求解

句子有误,应该是:Some (of them) are right,but some are wrong.
原句的第一句是错的