A skier is skiing on a snowy slope.
A man is skiing on a snowy slope.
The skier don't have to be a man.
exists e1 s1 x1 x2.(on(e1,x2) & n_slope(x2) & a_snowy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_ski(e1) & n_skier(x1))
exists e1 s1 x1 x2.(on(e1,x2) & n_slope(x2) & a_snowy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_ski(e1) & n_man(x1))