7.4 It's for sb.和 It's of sb.
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1)for sb. 常用于表示事物的特征特點(diǎn),表示客觀形式的形容詞,如easy, hard, difficult,  interesting, impossible等:
   It's very hard for him to study two languages. 對(duì)他來說學(xué)兩門外語(yǔ)是很難的。
2)of sb的句型一般用表示人物的性格,品德,表示主觀感情或態(tài)度的形容詞,如good, kind, nice, clever, foolish, right。
   It's very nice of you to help me. 你來幫助我,你真是太好了。
 
for 與of 的辨別方法:
   用介詞后面的代詞作主語(yǔ),用介詞前邊的形容詞作表語(yǔ),造個(gè)句子。如果道理上通順用of,不通則用for。如:
   You are nice. (通順,所以應(yīng)用of)。
   He is hard. (人是困難的,不通,因此應(yīng)用for。)








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