Baby sitting at a beach.
The baby is not wearing a diaper.
sitting  doesn't always mean not wearing a diaper.
exists e1 x1 x2.(ne_nam_baby(x1) & at(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_sit(e1))
exists x1.(n_baby(x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_diaper(x2)))