A boy sitting in water.
A boy plays in some water.
Just because a boy is sitting in water does not mean he plays.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_water(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_boy(x1))
exists e1 x1 x2.(in(e1,x2) & n_water(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))