请教一个语法知识点Chinese regulations requiring domestic control over companies engaged in many kinds of financial transactions had limited the ability of eBay’s payment mechanism. 请教上文的require为何要用现在分词形式requir

请教一个语法知识点
Chinese regulations requiring domestic control over companies engaged in many kinds of financial transactions had limited the ability of eBay’s payment mechanism.
请教上文的require为何要用现在分词形式requiring,谢谢!

因为该出要求是主语,后面的是要求的对象,所以用主动语态.ING在这里是做定语,修饰前面的Chinese regulations