A dog in a field with a Frisbee.
A dog is in a field.
A dog in a field is the same as a dog is in a field.
exists x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_frisbee(x3) & in(x1,x2) & n_field(x2) & n_dog(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_field(x2)) & n_dog(x1))