There is an aquatic bird in flight about to land on the water.
There is a bird in flight.
An aquatic bird is indeed a bird, therefore a bird is in flight.
exists p1 x1 x5.(n_water(x5) & exists p2 s1 s2 x2 x3 x4.((x1 = x2) & in(x2,x3) & Topic(s2,p2) & Actor(s2,x4) & a_about(s2) & exists e1.(on(e1,x5) & Actor(e1,x4) & v_land(e1)) & (x3 = x4) & n_flight(x3) & n_bird(x2) & a_aquatic(s1) & Theme(s1,x2)))
exists p1 x1 x2 x3.((x1 = x2) & in(x2,x3) & n_flight(x3) & n_bird(x2))