after having heard the news,she fainted.

问题描述:

after having heard the news,she fainted.
这里是第三人称为什么要用having

after引导的不是句子,而是一个介词短语,所以用现在分词作after这个介词的宾语,即have->havingafter也可以引导句子,但要加主语,如下:After she had heard the news,she fainted.注意:要用过去完成时,因为主句用了一...