Boys playing baseball by the water.
Boys playing baseball underwater.
By the water is the complete opposite of underwater.
exists e1 x1 x2 x3 x4.(n_water(x4) & a_topic(x1) & by(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_baseball(x3) & (x1 = x2) & n_boy(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_underwater(x3) & of(x3,x4) & n_baseball(x4) & (x1 = x2) & n_boy(x1))