A casual family stroll by the water.
A family strolls by the water to feed some ducks.
A casual family stroll by the water is not necessarily to feed some ducks.
exists s1 x1 x2 x3.(n_water(x3) & a_topic(x1) & by(x1,x3) & n_stroll(x1) & of(x1,x2) & n_family(x2) & a_casual(s1) & Theme(s1,x1))
exists e1 p1 x1 x2.(n_water(x2) & by(e1,x2) & Topic(x2,p1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_feed(e2) & n_duck(x3)) & Actor(e1,x1) & v_stroll(e1) & n_family(x1))