A family prepares to ride on the water.
The people are thinking about the water and maybe taking a ride on it.
Prepares to ride on the water does not imply thinking about maybe doing it.
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 e2 e1 s1 x1 x2 x3.(n_thing(x2) & n_people(x1) & n_water(x2) & a_maybe(s1) & Manner(e2,s1) & Theme(e2,x3) & Actor(e2,x1) & v_take(e2) & on(x3,x2) & n_ride(x3) & about(e1,x2) & Actor(e1,x1) & v_think(e1))