sb be done to do句型的疑问

sb be done to do结构例如 He is thought to be hiding in the woods.

我们知道这种结构相当于是It is thought that he is hiding in the woods.这个句型转化而来那么这里为什么不直接用He is thought hiding in the woods?即用现在分词作主语补足语,因为He is found smoking in the kitchen.这个句子也是正确的。这里用不定式和分词作主语补足语有什么本质的区别么?请各位专家不吝赐教。


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