A man sitting on a park bench watching pigeons.
A man is bird watching
watching pigeons is a rewording of bird watching
exists e1 e2 x1 x2 x3 x4 x5.(a_topic(x1) & for(e1,e2) & Theme(e2,x5) & Actor(e2,x2) & v_watch(e2) & n_pigeon(x5) & on(e1,x3) & n_bench(x3) & of(x3,x4) & n_park(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists p1 x1.(exists s1 x2.((x1 = x2) & n_watching(x2) & a_bird(s1) & Theme(s1,x2)) & n_man(x1))