For a three-act plot analysis, put on your screenwriter’s hat. Moviemakers know the formula well: at the end of Act One, the main character is drawn in completely to a conflict. During Act Two, she is farthest away from her goals. At the end of Act Three, the story is resolved.
We also can't give you a Three Act Plot Analysis of Ovid's Metamorphoses. That's because it has no plot – and therefore not even one act! For an introduction to how Ovid's compendium of over 200 stories is organized into some sort of chronological order, check out our "Summary."