it's adj.of/for 的疑问it's adj.of sb to doit's adj.for sb to do 有什么区别it's adj.for it's adj.of 我懂了

it's adj.of/for 的疑问it's adj.of sb to doit's adj.for sb to do 有什么区别it's adj.for it's adj.of 我懂了
it's adj.of/for 的疑问
it's adj.of sb to do
it's adj.for sb to do
有什么区别
it's adj.for
it's adj.of 我懂了

it's adj.of/for 的疑问it's adj.of sb to doit's adj.for sb to do 有什么区别it's adj.for it's adj.of 我懂了
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 problem.
你真聪明,解出了这道数学题.
若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.
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.
It’s difficult for us to finish the work.对我们来说,完成这项工作很困难.
注 意 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
of sb.的句型通常都可转换为不定式作状语的句子,但for sb.句型不可以.
It’s very nice of you to offer me a seat.
= You are nice to offer me a seat.十分感谢你给我让座.
It is careless of him to lose so many things.
= He is careless to lose so many things.他丢了这么多东西,真是太粗心了.
It’s very important for you to practise your oral English in daily life.
在日常生活中练习你的英语口语非常重要的.
这句话不能说成：It is very important of you to practise…

一个简单的判断方法:
如果原句可表述为：sb.+be +adj 则用of, 否则用for。
例如It's very kind ___ you to say so.
可以说成You are very kind.故填of.
又如It's very difficult ___ you to work out the problem.就不能说成You are difficu...

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一个简单的判断方法:
如果原句可表述为：sb.+be +adj 则用of, 否则用for。
例如It's very kind ___ you to say so.
可以说成You are very kind.故填of.
又如It's very difficult ___ you to work out the problem.就不能说成You are difficult.(应该是做出题“难”，而不是“you”难)。所以填for.
你可以找几道题试一试我说的方法。这样解释可以吗？
问题补充：
it's adj. for sb to do就是对某人来说，to do 的事情很怎么样（adj说明）即
原句型=
to do sth is adj for sb.
你可以找几个句子试一试我说的方法。这样解释可以吗？

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it's adj. of sb to do sth是“某人做了某事，是adj的，这个adj是修饰人的”，这种用法，用sb is adj，在句意上可以成立，如“ It's kind of you to help me”，这个kind就是修饰you，体现人所具有的特征。
而it's adj for sb to do sth，就不能像上面那样，如，“it's impossible for him...

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it's adj. of sb to do sth是“某人做了某事，是adj的，这个adj是修饰人的”，这种用法，用sb is adj，在句意上可以成立，如“ It's kind of you to help me”，这个kind就是修饰you，体现人所具有的特征。
而it's adj for sb to do sth，就不能像上面那样，如，“it's impossible for him to do that”，这种情况下，adj修饰的不是sb，不是体现sb的特征，而是做这件事情，对于sb 是adj的。
用这样的方法，如上面，sb is kind 可以说得通，而sb is impossible就不说不通了。把sb is adj这样一接，就可以看出是用of 还是for了。

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