A family prepares to ride on the water.
A family is getting ready for a car ride.
A car ride would not occur on the water.
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 p1 x1.(exists s1 x2 x3.(for(s1,x2) & n_ride(x2) & of(x2,x3) & n_car(x3) & Theme(s1,x1) & a_ready(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & n_family(x1))