A man skis on a snowy mountain.
A man skiing down a mountain slope.
man skis on a snowy mountain is same as man skiing down a mountain slope
exists e1 s1 x1 x2.(on(e1,x2) & n_mountain(x2) & a_snowy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_ski(e1) & n_man(x1))
exists x1 x2 x3 x4.(a_topic(x1) & down(x1,x3) & n_slope(x3) & of(x3,x4) & n_mountain(x4) & n_skiing(x1) & of(x1,x2) & n_man(x2))