名词性短语:语法学术语,指语法功能相当于名词的短语。比如thank you for your helpyour help 就是一个名词性短语
thank you for doing 感谢某人做某事 (名词是表示人,事物,地点或抽象概念的名称。代词是代替名词的一种词类,动名词就是ing形式的啦)
代词
thank you for后面接名词、动名词(动词的ing形式)
应该跟名词或动名词,thank you for your help.thank you for helping me.