A young boy was watching a goose.
The goose was the boy's pet.
Answer :The fact that the boy is watching a goose does not necessarily imply that it is the boy's pet
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_goose(x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1 x2 x3.(n_pet(x3) & of(x3,x2) & n_boy(x2) & n_goose(x1) & (x1 = x3))