A plane is taxiing next to some water
There are boats in the water.
Just because there is water doesn't mean there are boats in it.
exists e1 x1 x2.(to(e1,x2) & n_water(x2) & r_next(e1) & Actor(e1,x1) & v_taxi(e1) & n_plane(x1))
exists p1 x1 x2.(n_water(x2) & in(p1,x2) & exists x3.((x1 = x3) & n_boat(x3)))