关于complain(to + 名词)about+名词：对（……）抱怨……

she complained to me about his bad manners
是用的complain to sb. about sth.的句型
sb.是人称代词 sth.是名词 his bad manners 是名词性短语相当于名词
complain后不一定非的加名词

ME是名词啊，his bad manners 看作一个整体，这是名词啊。
你用中文来说“他的XX”不就是个物体，是个名词么。

Complain about:

后面接抱怨的内容或者从句；
Almost immediately he began to complain about the weather.
He get a full refund when he complain about the service.

Complain to Sb.
抱怨具体某人。
Complain to the boy's mother, not to me

complain to sb.about sth.意思是“对某人抱怨或投诉。。。事情”。本句中，to后是人称代词I的宾格me.about 后面的关键词是manners(习惯，行为），是名词，只不过在它之前加了一些形容词(his ,bad)而已。