A lady is playing with the baby laying on the couch.
A mother playing with her child
A lady with a baby is not necessarily the baby's mother.
exists e2 e1 x1 x2 x3 x4.(n_couch(x4) & n_baby(x2) & with(e1,x2) & on(e2,x4) & Actor(e2,x3) & v_lay(e2) & (x2 = x3) & Actor(e1,x1) & v_play(e1) & n_lady(x1))
exists x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_child(x3) & of(x3,x1) & n_female(x1) & n_playing(x1) & of(x1,x2) & n_mother(x2))