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.

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