A man is skiing on the tip of a mountain.
The man is wearing black clothing.
Not all skiers wear black clothing.
exists e1 x1 x2 x3.(n_tip(x2) & on(e1,x2) & of(x2,x3) & n_mountain(x3) & Actor(e1,x1) & v_ski(e1) & n_man(x1))
exists e1 s1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_clothing(x2) & a_black(s1) & Theme(s1,x2))