你坐下很不礼貌 It's not very polite _ _ _ _down

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你坐下很不礼貌 It's not very polite _ _ _ _down
再说一下什么时候用for什么时候用of,

答案：of you to sit
注：
it is +adj+for+sb+to+do+sth和 it is+adj+of+sb+to+do+sth的区别
用of 的话,adj就用来形容sb的.即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..故可以换成 sb is adj to do
比如：it‘s nice of you to help me.=you are nice to help me.
1 It’s very kind of you to help me.你能帮我,真好.
2 It’s clever of you to work out the maths problem.你真聪明,解出了这道数学题.
用for 是因为前面的adj是来描述do后面的sth.即形容词仅仅是描述事物,不是对不定式行为者的品格进行评价,用for sb.,这类形容词有difficult,easy,hard,important,dangerous,（im）possible等.如
1 It’s very dangerous for children to cross the busy street.
对孩子们来说,穿过繁忙的街道很危险.
2 It’s difficult for us to finish the work.对我们来说,完成这项工作很困难.
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