A bird flies above the water.
The bird is flying.
A bird flies is just as bird flying
exists e1 x1 x2.(n_water(x2) & above(e1,x2) & Actor(e1,x1) & v_fly(e1) & n_bird(x1))
exists e1 x1.(n_bird(x1) & Actor(e1,x1) & v_fly(e1))