1.“It’s +adj.+of+sb.+不定式”表示“某人(做某事)怎么样”.注意：这一句型中常用描述行为者的性格、品质的形容词,如good(好的),kind(友善的),nice(友好的),polite(有礼貌的),clever(聪明的),foolish(愚蠢的),lazy(懒惰的),careful(细心的),careless(粗心的),right(正确的),wrong(错误的)等.例如,It’s very kind of you to help me.(=You are very kind to help me.)你能帮助我,真好.It’s very rude of her to say such words.(=She is very rude to say such words.)她说这样的话,真粗鲁.It’s foolish of him to go alone.(=He is foolish to go alone.)他单独出去太傻了.
2.“It’s+adj.+for+sb.+不定式”表示“做某事对某人来说怎么样”.注意：这一句型中常用的形容词有important(重要的),necessary(必要的),difficult(困难的),easy(容易的),hard(艰难的),dangerous(危险的),safe(安全的),useful(有益的),pleasant(舒适的),interesting(有趣的),impossible(不可能的)等.例如,It’s not easy for them to learn a foreign language.(=To learn a foreign language is not easy for them.)对于他们来说学好一门外语不容易.It’s very important for students to listen to teachers carefully.(=To listen to teachers carefully is very important for students.)对于学生来说上课认真听老师讲课是非常重要的.It’s necessary for us to get to school on time.(=To get to school on time is necessary for us.)对于我们来说按时到校是非常必要的.
3.表示感情或情绪的形容词,如glad(高兴的),pleased(高兴的),sad(忧伤的),thankful(感激的)等常接不定式.例如,Glad to see you.见到你非常高兴.I’m very sad to hear the bad news.听到这个坏新闻,我非常难过.
4.表示能力和意志的形容词,如ready(乐意的,有准备的),able(有能力的),sure(一定),certain(一定)等常接不定式.例如,Lei Feng is always ready to help others.雷锋总是乐于助人.He is sure to get to school on time.他一定会按时到校
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