| 英语名词有 -'s和of- 两种形式的所有格。   1. -'s形式(以 -s结尾的复数名词用 “ ' ”形式):一般用于表示有生命的名词,如:the boy's mother the sheep's skin the teachers' club
   但下列情况非生命名词的所有格仍可用 -'s:a. 表示价值、时间、距离和数量等名词,如:
 ten cents' stamp    four years' study
 a mile's distance
   b. 表示大洲、海洋、国家、江河、城镇等地理名称及天体、地区、场所等名词,如:Asia's future        China's development
 Beijing's weather      the world's population
 the hotel's entrance
   c. 拟人化的名词,如:the science's power      duty's call
   d. 表示店铺或某人的家的名词,并且这些名词的所有格常独立使用,省略后面被修饰的名词;有时为了避免重复也省略后面的名词,如:She has just been back from the stationer's 
              (the barber's , the baker's, the tailor's, the grocer's).
 她刚从文具店(理发店、面包店、服装店、杂货店)回来。
 The reference book is Tom's.(Tom's 
              reference book)
   e. 一些习惯用语,如:for convenience's sake (为方便起见)
 at arm's length (在伸手可及的地方)
 at one's wit's end (智穷计竭)
 within a stone's throw (of) ((离)一箭之遥)
   2. of-所有格形式:主要用于表示无生命的名词,如:the legs of the table
   of-所有格的名词词组如在本句类似结构中再出现时,常用that/those代替,如:The population of Shanghai is greater 
              than that of Paris.
 The rules of our school are quite different 
              from those of other schools.
 
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