It's not polite of you to spit in public.解释下这里OF的用法.

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It's not polite of you to spit in public.解释下这里OF的用法.
It's not polite of you to spit in public.
解释下这里OF的用法.

It's not polite of you to spit in public.解释下这里OF的用法.
有时作主语的不定式比较长,为了使句子结构显得平稳,常用形式it代替不定式放在句首,而把不定式置后,构成句型:it is +形容词 to do sth..如果要表示不定式的动作是谁做的,一般在不定式前加for sb.
如:It is useful for you to learn English well.
当形容词kind,nice,wise,clever,wrong,right,foolish,careful,forget 等作表语时,不定式前常加of sb.,表示对人做某事的赞许、感激或责备等含义.
如:It is very kind of you to help me.

of 前面的形容词用来形容人的品质
如:it's nice of you.

介词,修饰前面的polite,整个是个固定词组,修饰名词