A biker rides a motorcycle on a racetrack
Therre is a motorcycle race going on.
Not all motorcycle riding on a racetrack is done during a race.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & on(x2,x3) & n_racetrack(x3) & n_motorcycle(x2) & n_biker(x1))
exists p1 x1.(ne_nam_therre(x1) & exists e1 s1 x2 x3 x4.((x1 = x2) & a_on(s1) & Manner(e1,s1) & Actor(e1,x4) & v_go(e1) & (x2 = x4) & n_race(x2) & of(x2,x3) & n_motorcycle(x3)))