Whose Lego Yoda is this? (he)
It's his.
Whose socks are they? (she)
They're hers
Whose cherries are those? (they)
They're theirs.
Whose pet tiger is that? (he)
It's his.
Whose glasses are these? (you)
They're yours.
Whose money tree is this? (we)
It's ours.
Whose chocolate is this? (I)
It's mine