A family prepares to ride on the water.
A group of people are preparing to go swimming.
Ride on the water does not imply to go swimming.
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 x2.(Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_go(e2) & n_swimming(x3)) & of(x1,x2) & n_people(x2) & n_group(x1))