1、1. Its +形容词+ of+ sb. + 动词不定式这一句型表示“某人（做某事） “。常用形容词有： good, kind, nice, polite, clever, foolish, lazy, careful, careless, right, wrong 等，来说明“人“ 的性质或特征。Its very kind of you to help me. 你能帮助我真是太好了。Its foolish of you to make such mistake. 你真傻啊，竟然犯这种错误。2. Its +形容词 +for + sb. +动词不定式这一句型表示“做某事对某人来说 “。常用形容词
2、有： difficult, easy, hard, dangerous, safe, useful, pleasant, interesting, impossible 等，来说明动词不定式的性质、特征。It is impossible for a child to answer the question. 小孩子不可能回答出这个问题。Its dangerous for you to swim alone. 你自己一个人去游泳很危险。3. 主语+be 动词 +形容词+动词不定式这一句型常用表示感情或情绪的形容词，如：glad, pleased, sorry, sad, thankful 等以及表示能力和意志的形容词，如:ready, able, sure, certain 等。Im very sorry to hear the news. 听到这个消息我很难过。Im glad to see you. 见到你我很高兴。Comrade Lei Feng is always ready to help others. 雷锋同志总是乐于帮助别人。Tom is sure/ certain to come. 汤姆一定会来。
