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I have received a letter from my old school,informing me tha

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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
I have received a letter from my old school,informing me tha
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.