问题描述：
请帮我分析一下下面句子中informing这个分词是作什么句子成分,
I have just received a letter from my old school,informing me that my former headmaster,Mr Strart Page,will be retiring next week.
I have just received a letter from my old school,informing me that my former headmaster,Mr Strart Page,will be retiring next week.
问题解答：
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