名词的所有格：
1、's 所有格：
1）构成：
A. 一般词尾+ 's.：the teacher's office, Xiao Li's sister's husband's mother.
B. 以s 结尾的复数名词只+"' "：workers' rest room.
C. 不以s结尾的复数名词加's：children's toys.
D. 复合名词只在最后一个词的后面加's：my sister-in-law's brother.
E.表示共同所有的几个名词，只在最后一个词的后面加's：This is Tom, James and Dick's room.
F. 表示各个所有关系的几个名词，在每个名词后分别加's：
Jenny's, Jean's and Mary's rooms face to the south.
G. 名词短语只在最后一个词后加's： a quarter of an hour's talk.
2）用法：
A. 名词所有格主要用于表示有生命的名词，表示所属关系：Lei Feng's dairy.
B. 用于表示时间的名词：today's paper. an hour's drive. Friday's work.
C. 用于表示地理、国家、城市等名词：the country's plan. the farm's fruit. China's population.
D. 用于表示由人组成的集体名词：our party's stand
E. 用于表示度量、价值的名词：two dollars' worth of books. a pound's weight.
2、of所有格：
1）凡不能用's 属格的情况可用of 属格表示所属关系：
the City of New York. a map of China.
2）下列情况通常要用of 属格：
A. 当名词有较长的定语时：
the name of the girl standing at the gate.
Have you read the articles of the students who were with us yesterday.