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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