1
非谓语动词的完成被动式: to have been done
2 非谓语动词的
过去分词: to be done
各举个例子:
1 The good student is said to have been admitted into Tsinghua University.
2 The college entrance examination is to be held tomorrow.
简单理解一下:
例1中的非谓语动词的完成被动式: to have been done 强调已经事情已经完成。
例2中 非谓语动词的过去分词: to be done,多用于将来时,表示尚未发生。
其实本质上和完成被动式与过去分词表示的意思一样,只是多了一个To.