The biker is riding around a curve in the road.
The biker is riding a BMX bike down the road.
The biker is not necessarily riding a BMX bike.
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 x4.(n_road(x4) & n_biker(x1) & down(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & (x2 = x3) & ne_org_bmx(x3))