I have received a letter from my old school,informing me that my former headmaster ...为什么用informing,句中做什么成分?详细解说

问题描述:

I have received a letter from my old school,informing me that my former headmaster ...
为什么用informing,句中做什么成分?详细解说

informing me that my former headmaster ...
这是伴用状语

定语,修饰letter

我收到一封从我以前的学校发来的信,通知我老校长——
informing 是现在进行时形式,因为前句中有现在完成时(have received ,以前发生的动作并与现在有关的),整个动作并未结束,所以这里用进行时.

一定要加ing 后面是对前面的一个解说
如she is a girl weaeing a pair of glasses