A waterfall cascades into a shallow pool.
The man floats down the river.
Either there is a man or just a waterfall.
exists e1 s1 x1 x2.(into(e1,x2) & n_pool(x2) & a_shallow(s1) & Theme(s1,x2) & Actor(e1,x1) & v_cascade(e1) & n_waterfall(x1))
exists e1 x1 x2.(n_river(x2) & n_man(x1) & down(e1,x2) & Actor(e1,x1) & v_float(e1))