Answer: The recurring motif of "fair is foul, and foul is fair" in Acts II and III of William Shakespeare's Macbeth is demonstrated by the presence of witches and their prophecies.
Step-by-step explanation:
In Act II, Scene I, Macbeth sees a dagger in the air as he prepares to murder King Duncan. The dagger, he says, looks real but is unreal, which represents the motif of "fair is foul, and foul is fair." Additionally, in Act III, Scene v, Hecate, the goddess of witchcraft, speaks of the witches and says that "fair is foul, and foul is fair." Thus, this scene is another example of the motif.