A skateboarder doing tricks on a brick wall next to stairs.
A skateboarder is doing tricks.
A skateboarder doing tricks is doing just that.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & to(e1,x6) & n_stair(x6) & r_next(e1) & on(e1,x4) & n_wall(x4) & of(x4,x5) & n_brick(x5) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_trick(x3) & (x1 = x2) & n_skateboarder(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & n_skateboarder(x1))