A snowboarder glides through the air.
The snowboarder is a woman.
A snowboarder is not always a woman. Can be a man also.
exists e1 x1 x2.(n_air(x2) & through(e1,x2) & Actor(e1,x1) & v_glide(e1) & n_snowboarder(x1))
exists p1 x1.(n_snowboarder(x1) & exists x2.((x1 = x2) & n_woman(x2)))