She's not his friend, she's mine
Robert didn't drink his own coffee. He drank hers
That is one of her friends.
His neighborhood is safe, while my neighborhood isn't.
His neighborhood is safe, while mine isn't.
Did your mother call?
I don't know them very well.
I don't know their daughter very well.
I talked to my grandmother for three hours last night.
I think I got my notes mixed up with yours