Bikers race through a forest.
People on bikes are going fast through trees.
If bikers race they are on bikes
exists x1 x2 x3.(a_topic(x1) & through(x1,x3) & n_forest(x3) & n_race(x1) & of(x1,x2) & n_biker(x2))
exists e1 s1 x1 x2 x3.(through(e1,x3) & n_tree(x3) & a_fast(s1) & Manner(e1,s1) & Actor(e1,x1) & v_go(e1) & on(x1,x2) & n_bike(x2) & n_people(x1))