Indefinite pronouns can be made possessive with the use of ‘s. Indefinite pronouns are words like someone, other, and any.

It’s always good to know one’s enemy.   one’s

Is this anyone’s backpack lying here on the ground?  anyone’s

That’s not Helen’s handwriting; it must be someone else’s. else’s

Try putting yourself in another’s shoes.   another’s

 

Possessive pronouns do not need apostrophe.

Who’s book is that? = Whose book is that?

That book is his’. = That book is his.

No, it’s mine’s! = No, it’s mine!

The cat washed it’s face. = The cat washed its face.