A man talks to a mounted policeman.
The police man is on a horse
mounted policeman almost the same as  police man is on a horse
exists e1 x1 x2 x3.(a_topic(x1) & to(x1,x3) & n_policeman(x3) & Theme(e1,x3) & v_mount(e1) & n_talk(x1) & of(x1,x2) & n_man(x2))
exists p1 x1 x2.(n_man(x1) & of(x1,x2) & n_police(x2) & exists x3.(on(x1,x3) & n_horse(x3)))