A snowboarder is doing a flip over a mound of snow.
There is someone doing tricks on their snowboard.
a snowboarder is someone and they done flips over snow mound.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & over(x2,x3) & of(x3,x4) & n_snow(x4) & n_mound(x3) & n_flip(x2) & n_snowboarder(x1))
exists p1 x1 e1 x2 x3 x4 x5.((x1 = x2) & on(e1,x5) & n_snowboard(x5) & of(x5,x2) & n_thing(x2) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_trick(x4) & (x2 = x3) & n_person(x2))