it的名词性物主代词和形容词性物主代词是一样的,都是its；
用作形容词性物主代词时，它后面必须接有被修饰的名词；
用作名词性物主代词时，它后面不能有被修饰的名词，但实际上its用作名词性物主代词的用法很少见。
例句：
Its history is expressive of the character and development of the people who possess it.它的`历史体现了其拥有者的性格特征和发展过程。
The car is in remarkably good condition for its age就车龄而论，这辆车的状况好极了。
My computer seems to have a mind of its own!我的电脑好像也有它自己的想法！
