A snowboarder slides along a ramp over a snowy gap.
A snowboarder is practicing a dangerous maneuver.
A snowboarder sliding along a ramp could be competing instead of practicing. The maneuver isn't automatically dangerous, it could be very safe depending on the snowboarder's skill.
exists e1 s1 x1 x2 x3.(along(e1,x2) & over(x2,x3) & n_gap(x3) & a_snowy(s1) & Theme(s1,x3) & n_ramp(x2) & Actor(e1,x1) & v_slide(e1) & n_snowboarder(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_maneuver(x2) & a_dangerous(s1) & Theme(s1,x2) & n_snowboarder(x1))