怎么用for和of,很多句子都用到这两个词,但不明白为什么要用._百度...答: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...