Question

Thanks for your helping me

这里为什么要用your

Answer 1

因为for介词，后面跟名词，helping是动名词，而名词要用物主代词修饰

Answer 2

这是比较传统的用法，现代英语经常用Thank you for helping me. 或Thank you for your help.

Answer 3

这里的helping为名词 your它的作定语

Answer 4

我觉得你的这个句子有问题！你把两个句子弄混了！应该是thank you for your help和thank you for helping me！我是六年级老师，刚刚给学生讲过这个！希望对你有帮助！加油！

Answer 5

i think "your helping me" is a pattern which is commonly used and has become an idiom. well, if u want a syntactic explain... here "helping me" can be regarded as a single word like an noun. That's the idea. Hope this may help u. :-P