A snowboarder is throwing up snow as he rides his board.
The snowboarder is boarding down the slope.
snowboarder  rides his board means snowboarder is boarding
exists e1 p1 s1 x1 x2 x3.(exists e2 x1.(Theme(e2,x3) & Actor(e2,x1) & v_ride(e2) & n_male(x1)) & n_board(x3) & of(x3,x1) & n_male(x1) & as(e1,p1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_snow(x2) & n_snowboarder(x1))
exists e1 s1 x1 x2.(n_slope(x2) & n_snowboarder(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_board(e1))