你这问题有个前提：就是不定式作后置定语.
He has a lot of work to do.
to do 的逻辑宾语是a lot of work ,即动词不定式与它所修饰的词之间有动宾关系.
to do 的动作由主语来执行,也就是说它的逻辑主语是主语,不定式是主语的逻辑谓语,也就是说：to do 与主语是逻辑上的主谓关系.
另：如果动词不定式与句子的主语没有主谓关系,要用不定式的被动形式.如：
Tom, I am going to shopping ,Do you have anythin to be bought?
句子主语是you ,而不定式的执行者是I,没有主谓关系,用了to be bought被动形式.非常感谢 分析的很透彻！！！！！！！！！！！！呵呵，祝成功。再向你请教一下哈each student in my class is working as hard as _can.到底 是填he 还是they 呢each在正式文件中的替代词是they..