Skateboarding grinding in a bootleg skate park.
A bike rider is on a street.
A skate park is not the street.
exists e1 x1 x2 x3 x4.(in(e1,x2) & n_park(x2) & of(x2,x4) & n_skate(x4) & of(x2,x3) & n_bootleg(x3) & Actor(e1,x1) & v_grind(e1) & n_skateboard(x1))
exists p1 x1 x2.(exists x3.(on(x1,x3) & n_street(x3)) & n_rider(x1) & of(x1,x2) & n_bike(x2))