1.Yes,it is hers.It belong to her.
2.Yes,they are theirs.They belong to them.
3.Yes,it is mine.It belong to me.
4.Yes,They are hers.It belong to her.
5.Yes,it is yours.It belong to you.
6.Yes,it is his.It belong to him.
7.Yes,they are him and hers.They belong to him and her.
8.Yes,they are yours.They belong to you.
9.Yes,ther are theirs.They belong to them.