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.
Act I
The King of Navarre and his pals take an oath to swear off women. Their resolve is tested when the Princess of France and her women arrive on the scene.
Act II
The men go through elaborate rituals of wooing, culminating in a failed costume party and a play. Marcade enters with news of the French King's death.
Act III
The Princess of France rejects Navarre's offer to stay and love him. She and her ladies propose the men prove their love by waiting for a year.