The biker is riding around a curve in the road.
The biker is riding in a bike race.
The biker is not necessarily in a bike race.
exists e1 x1 x2 x3.(n_road(x3) & n_biker(x1) & in(e1,x3) & around(e1,x2) & n_curve(x2) & Actor(e1,x1) & v_ride(e1))
exists e1 x1 x2 x3.(n_biker(x1) & in(e1,x2) & n_race(x2) & of(x2,x3) & n_bike(x3) & Actor(e1,x1) & v_ride(e1))