A seagull is standing on a picnic table
A seagull is eating food.
He may not be eating food on the picnic table.
exists e1 x1 x2 x3.(on(e1,x2) & n_table(x2) & of(x2,x3) & n_picnic(x3) & Actor(e1,x1) & v_stand(e1) & n_seagull(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_food(x2) & n_seagull(x1))