题目

新概念英语第二册课文中的一道题
i have just received a letter from my school,informing me that my former headmaster will be retiring next week.
informing 是现在分词吗?如果是,与前面一句的主语不同啊,前一句的主语是我,而后一句的主语应该是那封信或是学校吧,我怎么能自己通知自己呢?这一块有点不明白,望指教

提问时间：2020-10-21

答案

我感觉其实这个informing和后面的东西应该是letter的同位语（或者定语,叫什么名字我忘记了）,只是由于letter后面要加上from my school 所以后面加了个逗号然后再写informing的
句子本来应该这样写道：i have just received a letter informing me that my former headmaster will be retiring next week,the letter is from my school.