How do the witches in Macbeth contribute to the theme of good versus evil?

Answer:
The witches show the fact that if you turn bad you will be punished, this is shown by Macbeth who was first seen as a hero who then turned bad dreaming of becoming king and got caught up in greed power and killing, but eventually the guilt got to him he saw a ghost of someone and felt it more then he was killed by Macduff and his wife who was being manipulative was thought to had killed herself.
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