A man climbs a snowy mountain.
There is a man surfing.
One cannot be surfing on a snowy mountain
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_mountain(x2) & a_snowy(s1) & Theme(s1,x2) & n_man(x1))
exists p1 x1 x2 x3.((x1 = x2) & n_surfing(x2) & of(x2,x3) & n_man(x3))