A dog running in a field.
The pet is sitting on the couch.
A dog running in the field is different than a pet sitting on a couch
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_field(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1))
exists e1 x1 x2.(n_couch(x2) & n_pet(x1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))