we discovered him above his company.
我们发现他高人一等。
改成被动句He was discovered to be above his company.为什么要把作宾补的介词短语变成不定式?
这两句的to be都可以省略的。
We discovered him (to be) above his company.
He was discovered (to be ) above his company.
这些句子都对。