sentences:  The shepherd confirms Jocasta's story.From Corinth, Phorbes then arrives to ask Oedipus to succeed Polybus, and then reveals that Polybus and Merope were his adoptive parents, not his biological parents.It turns out that Merope's own child had died at birth, and Phorbes replaced that child with Oedipus, whom the Shepherd had not the heart to abandon to the elements.