This is beautiful evening with the river and the setting sun.
A couple watches the beautiful sunset.
This is beautiful evening with the river and the setting sun does not indicate that a  couple watches the beautiful sunset.
exists p1 x1 x2 x3 x4.(n_setting(x4) & n_river(x3) & with(p1,x2) & subset_of(x4,x2) & Time(x4,x1) & n_sun(x1) & subset_of(x3,x2) & exists s1 x5.((x1 = x5) & n_evening(x5) & a_beautiful(s1) & Theme(s1,x5)) & n_thing(x1))
exists e1 s1 x1 x2.(n_sunset(x2) & a_beautiful(s1) & Theme(s1,x2) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_couple(x1))