A firetruck rushes to the scene of an accident.
there is a big fire
The scene of an accident might not have a big fire.
exists e1 x1 x2 x3.(n_scene(x2) & to(e1,x2) & of(x2,x3) & n_accident(x3) & Actor(e1,x1) & v_rush(e1) & n_firetruck(x1))
exists p1 x1 s1 x2.((x1 = x2) & n_fire(x2) & a_big(s1) & Theme(s1,x2))