中考英语常识点：’s与of 属格的比照

　　1.标明所属联络时许多情况下可以交换

　　the boy’s arrival=the arrival of the boy

　　Mr. Smith’s passport=the passport of Mr. Smith

　　a cat’s tail=the tail of a cat

　　the government’s plan=the plan of the government

　　2.不可以交换的情况

　　1）有必要用’s的场合

　　① 当被润饰的名词后边有同位语时

　　He is my brother’s friend, a doctor.

　　Li Hua’s brother, a PLA man, is very good at English

　　② 标明分类时

　　He received a doctor’s degree last year

　　Have you a copy of the teacher’s book?

　　2) 只用of 的场合

　　① of + 名词规划中，名词后有润饰语或同位语时

　　He was very excited at the words of the people present at the party.

　　Have you seen the new car of the boy who talked with us just now?

　　② of 标明同为联络时

　　The city of Beijing 北京市

　　The two of us 咱们俩

　　③ 用于无生命的事物时：the subject of the sentence 语句主语

　　④傍边心词是名词化的名词时：the life of the poor 穷户的日子

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