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It is假主语句型中(for sb)换成(of sb)后的区别

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It is假主语句型中(for sb)换成(of sb)后的区别
区别是什么?最好有例子
It is假主语句型中(for sb)换成(of sb)后的区别
It's for sb.和 It's of sb.
  
  1)for sb. 常用于表示事物的特征特点,表示客观形式的形容词,如easy, hard, difficult, interesting, impossible等:
  It's very hard for him to study two languages. 对他来说学两门外语是很难的.
  2)of sb的句型一般用表示人物的性格,品德,表示主观感情或态度的形容词,如good, kind, nice, clever, foolish, right.
  It's very nice of you to help me. 你来帮助我,你真是太好了.
  for 与of 的辨别方法:
  用介词后面的代词作主语,用介词前边的形容词作表语,造个句子.如果道理上通顺用of,不通则用for.如:
  You are nice. (通顺,所以应用of).
  He is hard. (人是困难的,不通,因此应用for.)
  4、不定式的特殊句型too…to…
  1)too…to 太…以至于…
  He is too excited to speak.
  他太激动了,说不出话来.
  ---- Can I help you ? 需要我帮忙吗?
  ---- Well, I'm afraid the box is too heavy for you to carry it, but thank you all the same. 不用了.这箱子太重,恐怕你搬不动.谢谢您.
  2) 如在too前有否定词,则整个句子用否定词表达肯定, too 后那个词表达一种委婉含义,意 为"不太".
  It's never too late to mend. (谚语)
  改过不嫌晚.
  3) 当too 前面有only, all, but时,意思是:非常… 等于very.
  I'm only too pleased to be able to help you. 我非常高兴能帮助你.
  He was but too eager to get home. 他非常想回家.动词不定式的"to"与介词的"to"区别  to 有两种用法:
  一为不定式+动词原形;
  一为介词+名词/动名词, to 在下面的用法中是第二种,即to+ 名词/动名词:
  admit to承认,confess to承认,be accustomed to 习惯于,be used to 习惯于, stick to 坚持, turn to开始,着手于, devote oneself to 献身于, be devoted to 致力于, look forward to 盼望,pay attention to 注意