题目内容：

被动语态 改写句子
People believe that he is ill.
改写成 It is believed that he is ill
还是It is believed that he is ill by people.
因为It不是形式宾语嘛,会不会和by people重复,导致错误呢?
或改写成He is believed to be ill
还是He is believed to be ill by people.