A biker is racing downhill.
driving competetion is going on
We don't know that there is a driving competition.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_race(e1) & n_downhill(x2) & n_biker(x1))
exists e2 e1 s1 x1.(a_on(s1) & Manner(e2,s1) & Actor(e2,x1) & v_go(e2) & n_competetion(x1) & Actor(e1,x1) & v_drive(e1))