be silly to do sth.= It's silly of sb.to do sth.还要例句的

be silly to do sth.= It's silly of sb.to do sth.还要例句的 It's+形容词+for sb +to do sth与It's+形容词+of sb to do sth的区别 求“it upset sb.to do sth”的例句?, help sb.(to)do sth.的例句 persuade sb to do sth的例句 It+be+形容词+for/of sb to do sth It's adj to do sth 例句 It's polite of sb to do sth 准确翻译 用It’s+形容词+of sb to do sth造句 it's very kind of sb to do sth 翻译：It's very kind of sb. to do sth. 不定式做主语It+be+形容词+for sb.to do sth 和 It+be+形容词+of sb.to do sth