Whose cellphone is this? (Eric and his brother)
It's their cellphone. It's their cellphone.
Whose Game Boy is this? (your father)
It's my father's. It's his. /It's his cellphone.
Is this Ryan's electronic dictionary? (Daniel's)
No, it's not Ryan's electronic dictionary. It's his./ It's Daniel's
Is this my Discman? (Carol's)
No, it's not yours. It's hers. / It's her Discman.
Whose MP3 player is this? (Eric's)
It's Eric's./It's his.
Whose notebook is this? (you)
It's mine/ It my notebook.
