It is very kind of you to help me.

问题描述:

It is very kind of you to help me.
不是it is adj for sb、to do sth、的么?
为什么这里用 of 额.

可以说:You are very kind.但不能说:It is kind you.
kind 不直接修饰you.所以加of.It is kind of you to help me.
当然,你可以理解为固定搭配.这个短句很有用.