Bikers race through a forest.
The bikers raced
Raced is the past participle of race.
exists x1 x2 x3.(a_topic(x1) & through(x1,x3) & n_forest(x3) & n_race(x1) & of(x1,x2) & n_biker(x2))
exists e1 x1.(n_biker(x1) & Actor(e1,x1) & v_race(e1))