关于名词所有格 名词+of+名词,后一名词为什么有时候要加(’s),有时候又不加?例：the girl’s name→the name of the girl 女孩的名字 my father’s friend →the friend of my father’s 我父亲的朋友 请回答一下重点，〖我是说在已经用了of中的短语〗，后一名词为什么有时候要加(’s),有时候又不加？

1.名词's名词 表示。。。。的 一般使用在有生命的名词，比如人，狗，猫，鼠……
What's your name?此句子问人，所以用所有格名词's名词。
难道你有见过What name of you？
2.名词of名词 表示名词所属，一般使用在无生命的物体 比如桌子，椅子，花瓶……
the title of the novel

你好
无生命名词的所有格通常只能用名词+of+名词的结构来代替‘s结构
如The colour of the wall（墙的颜色）
The teacher of the scholl（学校的老师）
The window of the room（房间的窗户）
所以说名词+of+名词与’s是可以表达一样的意思的

你哪个是错误的。
1.名词's名词 一般使用在有生命的名词，比如人，狗，猫，鼠……
What's your name?此句子问人，所以用所有格名词's名词。
难道你有见过What name of you？
2.名词of名词 一般使用在无生命的物体 比如桌子，椅子，花瓶……
the title of the novel the window of the house

这里表示 的 的意思吧 ，也可能是英语中的固定搭配

这本问题本来我也在纠结,不过现在我搞清楚了,我来回答你.刚看了书,把书上的内容搬过来给你,
Double genitive
The double genitive,also referred to as the "post genitive",is so called because it is a combination of the genitive and the of-phrase:
a friend of my brother's
some neighbours of my grandparents'
Note that the second noun in the double genitive construction almost always refers to persons,never to objects.
Also note that the first noun usually has indefinite reference (typically premodified by the indefinite article) and the second noun is always definite:
a friend of my brother's
some friends of my parents'
any friend of the doctor's
a lot of friends of that doctor's
Exceptions to the rule are the cases where the first noun is premodified by a demonstrative or postmodified by a relative clause:
that friend of my brother's
those ideas of your sister's
the friend of Bob's who was here last night