A group of people are standing on a mountain in the snow.
People are swimming
One cannot be standing and swimming simultaneously.
exists e1 x1 x2 x3 x4.(n_snow(x4) & in(e1,x4) & on(e1,x3) & n_mountain(x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1.(Actor(e1,x1) & v_swim(e1) & n_people(x1))