A snowboarder jumping.
A snowboarder is sitting down.
Jumping is not sitting.
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_jump(e1) & (x1 = x2) & n_snowboarder(x1))
exists e1 s1 x1.(a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_snowboarder(x1))