A man is skiing in water.
A man is skiing down the snowy mountain
water is different from snowy mountain.
exists e1 x1 x2.(in(e1,x2) & n_water(x2) & Actor(e1,x1) & v_ski(e1) & n_man(x1))
exists e1 s1 x1 x2 x3.(n_mountain(x2) & of(x2,x3) & n_snowy(x3) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_ski(e1) & n_man(x1))