This is beautiful evening with the river and the setting sun.
IT is getting dark.
It gets dark in the evening.  if it is evening time, then it would be getting dark out.
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 p1 x1.(ne_nam_it(x1) & exists s1.(Theme(s1,x1) & a_dark(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1))