A skateboarder performing a kickflip over short stairs.
A skateboarder is kickflipping is skateboard.
Some skateboarders can kickflip on other things than a normal skateboard.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & over(e1,x4) & n_stair(x4) & a_short(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_kickflip(x3) & (x1 = x2) & n_skateboarder(x1))
exists e1 p1 x1 x2.(exists x3.((x1 = x3) & n_skateboard(x3)) & Actor(e1,x2) & v_kickflipp(e1) & (x1 = x2) & n_skateboarder(x1))