A baby sitting in a swing set swing.
The baby is having its diaper changed.
A baby is sitting on a swing not having its diaper changed.
exists e1 e2 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_set(e2) & n_swing(x4) & in(e1,x3) & n_swing(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_baby(x1))
exists e1 e2 x1 x2 x3.(n_diaper(x2) & of(x2,x1) & n_thing(x1) & n_baby(x1) & Theme(e2,x2) & Actor(e2,x1) & v_have(e2) & Actor(e1,x3) & v_change(e1) & (x2 = x3))