1. It's +形容詞+ of+ sb. +動(dòng)詞不定式
    這一句型表示"某人(做某事)……"。常用形容詞有：good, kind, nice, polite, clever, foolish, lazy, careful, careless, right, wrong等，來說明"人"的性質(zhì)或特征。
    It's very kind of you to help me. 你能幫助我真是太好了。
    It's foolish of you to make such mistake. 你真傻啊，竟然犯這種錯(cuò)誤。
    2. It's +形容詞+for + sb. +動(dòng)詞不定式
    這一句型表示"做某事對(duì)某人來說……"。常用形容詞有：difficult, easy, hard, dangerous, safe, useful, pleasant, interesting, impossible等，來說明動(dòng)詞不定式的性質(zhì)、特征。
    It is impossible for a child to answer the question. 小孩子不可能回答出這個(gè)問題。
    It's dangerous for you to swim alone. 你自己一個(gè)人去游泳很危險(xiǎn)。
    3. 主語+be動(dòng)詞 +形容詞+動(dòng)詞不定式
    這一句型常用表示感情或情緒的形容詞，如：glad, pleased, sorry, sad, thankful等以及表示能力和意志的形容詞，如:ready, able, sure, certain等。
    I'm very sorry to hear the news. 聽到這個(gè)消息我很難過。
    I'm glad to see you. 見到你我很高興。
    Comrade Lei Feng is always ready to help others. 雷鋒同志總是樂于幫助別人。
    Tom is sure/ certain to come. 湯姆一定會(huì)來。