Practicing skateboarding on the court.
Skateboard practice to avoid mistakes.
The practice could be for improvement instead of doing so to avoid mistakes.
exists e1 x1 x2 x3.(n_court(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_skateboarding(x2) & n_thing(x1))
exists p1 x1 x2.(a_topic(x1) & Topic(x1,p1) & exists e1 x3.(Theme(e1,x3) & Actor(e1,x1) & v_avoid(e1) & n_mistake(x3)) & n_practice(x1) & (x1 = x2) & ne_nam_skateboard(x2))