A family prepares to ride on the water.
Scouts are never prepared for anything.
Either the family is preparing or the scouts are not preparing.
exists e1 p1 x1 x2.(n_water(x2) & Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2.(on(e2,x2) & Actor(e2,x1) & v_ride(e2)) & n_family(x1))
exists e1 s1 x1.(a_never(s1) & Manner(e1,s1) & all x2.(n_thing(x2) -> for(e1,x2)) & Theme(e1,x1) & v_prepare(e1) & n_scout(x1))