A dog in a field.
There is an animal outside.
The animal outside is a dog.
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_field(x2) & n_dog(x1))
exists p1 x1 x2 x3.((x1 = x2) & n_outside(x2) & of(x2,x3) & n_animal(x3))