怎样区分It is+形容词+of sb to do sth 和It is+形容词+for sb to do sth

怎样区分It is+形容词+of sb to do sth 和It is+形容词+for sb to do sth
这个of 和for
什么时候用of什么时候用for

It is+形容词+of sb to do sth 是形容人的品质的,例如,It's kind of you to help me.It's nice of you to help me.
而It is+形容词+for sb to do sth则是形容事物的性质的,例如,It impossible for me to finish the job.It's hard for him to give up smoking.
这样说有点眉目了吗?

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