A dog plays in the water.
A dog is playing in the lake.
In the water is not necessarily in the lake.
exists e1 x1 x2.(n_water(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1))
exists e1 x1 x2.(n_lake(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1))