it's nice ---you 是 for还是of 为什么答:it is adj.of/for sb.to do.it 为形式主语,指代 to do 其中:若形容词是描述不定式行为者的性格、品质的,如kind,good,nice,right,wrong,clever,careless,polite,foolish等,用of sb..It’s very kind of you to help me.你能帮我,真好.It’s clever of you to work out the maths ...