A little girl is sitting on a toy tractor.
A child is sitting on a toy
A little girl is  a child.
exists e1 s1 x1 x2 x3.(on(e1,x2) & n_tractor(x2) & of(x2,x3) & n_toy(x3) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & a_little(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x2) & n_toy(x2) & Actor(e1,x1) & v_sit(e1) & n_child(x1))