For students only1）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, importang,impossible等：Its 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。Its very nice of you to help me. 你来帮助我，你真是太好了。3）辨析It is difficult for him to finish the task within two hours.It is kind of you to help me.It is generous of the little girl to share her toys with his brother .4）牛刀小试1. It was stupid _ me to talk in that way to my mother.2. It is very important _ us to master English.3. It was impossible _the little boy to carry such a heavy box.4. It is smart _ them to make good use of the Internet.For teachers only1）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, importang,impossible等：Its 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。Its very nice of you to help me. 你来帮助我，你真是太好了。3）辨析It is difficult for him to finish the task within two hours. (difficult 说明完成任务难)It is kind of you to help me. (kind说明你善良)It is generous of the little girl to share her toys with his brother .(说明小姑娘大方)4）牛刀小试1. It was stupid _ me to talk in that way to my mother.2. It is very important _ us to master English.3. It was impossible _the little boy to carry such a heavy box.4. It is smart _ them to make good use of the Internet.参考答案:1.of 2.for 3.for 4.of