A race car sparks.
A race car is sparking.
race car sparks can also be said as  race car is sparking.
exists x1 x2 x3.(a_topic(x1) & n_sparks(x1) & of(x1,x3) & n_car(x3) & of(x1,x2) & n_race(x2))
exists e1 x1 x2.(Actor(e1,x1) & v_spark(e1) & n_car(x1) & of(x1,x2) & n_race(x2))