The large white bird swoops down hovering above the water.
The large bird is sleeping.
A bird cannot be swooping down and sleeping at the same time.  Sleeping implies being stationary.
exists e2 e1 s1 s2 s3 x1 x2.(n_water(x2) & n_bird(x1) & a_white(s2) & Theme(s2,x1) & a_large(s1) & Theme(s1,x1) & for(e1,e2) & above(e2,x2) & Actor(e2,x1) & v_hover(e2) & a_down(s3) & Manner(e1,s3) & Actor(e1,x1) & v_swoop(e1))
exists e1 s1 x1.(n_bird(x1) & a_large(s1) & Theme(s1,x1) & Actor(e1,x1) & v_sleep(e1))