不定式做主語二
It's+ 形容詞 +for/of 邏輯主語 + 不定式短語
It's kind of you to think so much of us.難為你這樣替我們著想。
It's very nice of you to be so considerate.你太好了想得這么周到。
It's unwise of them to turn down the proposal.他們拒絕采納這個建議是不明智的。
It's bad for your health to sit up to late at night.晚上睡得太晚對你的健康有害。
It's not easy for you to get him to change his mind.你要說服他改變主意是不容易的。
It's impossible for him to give up smoking.要他戒煙是不可能的。
適合這個結(jié)構(gòu)的形容詞有以下這些：
一、傾向用"of"
Kind, good, nice, wise, unwise, clever, silly, wrong, right, foolish, stupid,
Careless, considerate, rude, naughty, impolite
二、傾向用"for"
Costly, illegal, immoral, unfair, unhealthy, unjust, unlawful, unreasonable,
