Two men are on a vehicle in the snow
Men are plowing the snow.
Just because the men are on a vehicle in the snow does not mean they are plowing it.
exists p1 x1 x3.(n_snow(x3) & exists x2.(on(x1,x2) & in(x2,x3) & n_vehicle(x2)) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_snow(x2) & Theme(e1,x2) & Actor(e1,x1) & v_plow(e1) & n_man(x1))