These are (he/his) sneaker shoes.
his
Those are (they/their) beach chairs.
their
These are (I/my) headphones.
my
These are (you/your) keys.
your
This is (I/my) lunchbox.
my
That is (her/she) pencil.
her
That is (it/its) house.
its
This is (we/our) classroom.
our