宾格代词：it
形容词所有格：its
名词所有格：its
its
adj.（形容词） it的所有格形式
Used as a modifier before a noun 作定语;在名词前用做修饰语：
The airline canceled its early flight to New York.
该航空公司取消了飞往纽约的早班飞机
用法:
Its, the possessive form of the pronoun it, is never written with an apostrophe.The contractionit's (for it is or it has ) is always written with an apostrophe.
Its 是代词 it 的所有格形式， 从来不用上标点，而缩写形式it's （代表 it is 或者 it has )通常都要与上标点连用
参考资料：美国传统词典[双解]