It is +adj+for sb to do sth(这时形容词是表示事物特征的,这样的形容词有necessary,important,等)
eg:It is important for us to learn English well.
It is +adj +of sb to do sth (这时形容词是表示人的品质的,这样的形容词有right ,wrong,stupid,wise ,polite,rude,等)
It is foolish of you to do that.=You are foolish to do that.
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