不是虚拟语气,be thought to do 被认为 相关短语：be thought to be被认为是
be thought to have done被认为已经……
be thought to do sth被认为
be thought to represent things被认为代表一些东西
is thought to be被认为是
不是虚拟语气,这是 be thought to 的用法,被认为…….相关短语
be thought to be 被认为是……；be thought to have done 被认为已经……