不定式的被动语态，动词ing形式的被动语态 如何区分

不定式的被动语态，动词ing形式的被动语态
如何区分to be done 和to have been done（不定式被动）
being done 和having been done （动词ing形式被动）
他们如何使用，区分，能举例吗？
谢谢！

to be done 和to have been done区别：用完成时表示已发生；不用表示未发生；
the president is said to have been impeached.表示已发生；
the president is said to be impeached.未发生；
being done 和having been done区分：being done与谓语同时；having been done表示发生在谓语之前；
he remembered his brother being beaten by classmates when they were young；
he found his brother having been beaten by classmates ；已经发生了。

我是来看评论的