The snowboarder is sitting down.
A snowboarder does a 540 degree spin.
The snowboarder cannot be sitting down as well as do a 540 degree spin at the same time.
exists e1 s1 x1.(n_snowboarder(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1))
exists e1 x1 x2 x3.(Time(e1,x3) & n_spin(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_degree(x2) & card_eq_540(x2) & n_snowboarder(x1))