Use of "of you" vs "for you" [closed]

1. "It is so kind of you to help me"
2. "It is so kind for you to help me"

What's the difference between "of" and "for" there?
(I know no one using the second one, but I want to figure out the difference between them.)

Solution 1:

There are two constructions here.

• (A) It is advisable for you to take regular exercise. = For you to take regular exercise is advisable [an advisable thing to do].
• (A') It is so kind for you to help me. = For you to help me is so kind [such a kind thing to do].

Note that "so kind for you to" scores almost 150 000 hits on Google, the first selection being largely relevant.

Note also that (B) 'It is so advisable of you to ...' is not acceptable.

.............

• (B') It is so kind of you to help me.

uses an of-phrase naming the referent after the adjective, thus 'kind of you', cf '[so] stupid of you', '[very] clever of you', 'thoughtful of him'; these may be followed by a to-infinitival: 'so sensible of her to wear walking shoes', 'very prudent of the Government to order so many doses of vaccine' etc.