Henry was happy to hear it.如何理解主句主语同时也是不定式结构的逻辑主语?

问题描述:

Henry was happy to hear it.如何理解主句主语同时也是不定式结构的逻辑主语?
对于这句话 Henry was happy to hear it.如何理解“主句主语同时也是不定式结构的逻辑主语”?

就是Henry was happy的主语是Henry,hear it的主语也是Henry.