非谓语动词having been done,to have been done什么时候用？

在句子中充当除谓语以外的句子成分的动词形式叫做非谓语动词。非谓语动词分为三种形式:不定式，动名词，和分词(分词包括现在分词和过去分词)。

1）不定式
时态\语态 主动 被动
一般式 to do to be done
完成式 to have done to have been done

2）动名词
时态\语态 主动 被动
一般式 doing being done
完成式 having done having been done

3）分词
时态\语态 主动 被动
一般式 doing being done
完成式 having done having been done

否定形式： not +不定式， not + 动名词， not + 现在分词
All things having been canceled because of the snowstorm, many passengers could do nothing but take the train.
如果弄懂了上面的 表格，你的非谓语动词就算掌握90%了，如果还有不懂了，可以发信息给我。

很明显，前者是完成时的进行被动态，而后者是完成时被动态的不定式结构。举个例子：This song is having been sung since for nine times by Sam in this evening.这首歌山姆今天晚上已经是第九次点唱了；Your homework is scheduled to have been finished before new term beginning.你的作业应该在新学期开始之前完成。后者比较常见，而前者比较少见，你可以参考一下。