请问：这句子中不定式作什么成分?
The professor is said to have made some advance in his research in the past year.
句中不定式TO HAVE MADE 作什么语?
能把每一部分充当什么成分说出来最好!
进一步说明一下我的问题：The Minister is believed to be thinking of imposing new taxes to raise extra revenue.书上说此句的不定式是作主语的补语，这里也有IS BELIEVED TO固定搭配。所以固定搭配不是重点。我只想知道IS SAID TO这固定搭配中的不定式是作啥语的。