it's very kind --you .为什么用of

it's very kind --you .为什么用of It's very kind of you to help me 为什么用of It’s very kind of you 急 It's very kind of you. It's very kind of you...和 It's very kind for you...的区别 It's very kind of... It's very kind of you 可不可以等于 you are very kind It's very kind of you ____and help us It's very kind of you" "(show)me the way. it's very kind of you[ ] ( do)that for me. it's very kind of you to give me a It’s very kind of you to help me.意思?