Question

8．學(xué)好一門外語對我們的未來發(fā)展非常有用．
It is very useful for our future development to learn a foreign language well．

Answer 1

分析 It is very useful for our future development to learn．

解答 答案：It is very useful for our future development to learn．結(jié)合句意這里是說客觀事實用一般現(xiàn)在時，表示對某人來說做某事是怎樣的用It's adj+for+sb to do sth，it是形式主語，動詞不定式是真正主語，useful形容詞有用的，我們的未來發(fā)展our future development，學(xué)習(xí)learn，故答案是It is very useful for our future development to learn．

點評 It's adj+for+sb to do sth．it是形式主語，動詞不定式是真正主語，for前面的形容詞是指某人做某事的性質(zhì)，強調(diào)的是事．比如說，It's good for us to exercise more．
而如果是It's adj+of+sb to do sth，其中of前面的形容詞則是做事的這個人的品格．比如說I's kind of him to help us．