这是什么语法规则：be V-ed+to V

be V-ed+to V：被动语态＋动词不定式 be V-ed 结构︰被动语态to V结构︰动词不定式例句He was asked to do his homework yesterday.他昨天被要求做他的作业。在句中 was asked to do就是被动语态＋动词不定式结构。这种用法不是一个语法规则，而是两个语法规则加在一起。