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1、1.It is adj. + for +sb.+ to do 与事物有关的形容词时用 for (e.g. possible,impossible, important,necessary,essential,convenient,difficult,hard, easy,useless...) 例句：It is difficult for him to do so. 2.It is adj. + of +sb.+ to do 与人的赞美和批评有关的形容词时用of(e.g. nice,kind,wise, good, polite, impolite, right, clever, bad, wrong, cruel, stupid, foolish...) 例句：It is very considerate of you to help me.。
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