A man is skiing in water.
A man is waterskiing
skiing in water is a rewording of ' water skiing.'
exists e1 x1 x2.(in(e1,x2) & n_water(x2) & Actor(e1,x1) & v_ski(e1) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_waterskie(e1) & n_man(x1))