One person snowboarding while others look on.
A woman is snowboarding with no one around.
One person does not imply a woman. If others look on there cannot be no one around.
exists e1 p1 x1 x2.(a_topic(x1) & exists e2 p2 x3.(exists s1.(Theme(s1,x3) & a_on(s1)) & Topic(e2,p2) & Actor(e2,x3) & v_look(e2) & -(x3 = x1) & n_person(x3)) & n_person(x1) & while(e1,p1) & Actor(e1,x2) & v_snowboard(e1) & (x1 = x2) & n_person(x1) & card_eq_1(x1))
exists e1 x1.(-exists s1 x2.(with(e1,x2) & n_thing(x2) & card_eq_1(x2) & a_around(s1) & Theme(s1,x2)) & Actor(e1,x1) & v_snowboard(e1) & n_woman(x1))