for sb doing sth

Question

各位大哥大姐
有没有for sb doing sth或for sb to do sth，如果有的话是啥意思，简单一点回答我，谢谢！回答好的我多加分。

Answer 1

It is + 形容词 for sb. to do sth 某人做某事怎么样 例：It is impossible for him to finish it.
It is + 形容词 of sb. to do sth 某人做某事怎么样（形容词强调人的性格，品德）例:It is kind of you to help me .
Thank sb. for sth./doing sth 例:Thank you for your help./Thank you for helping me.

Answer 2

ask for 请求