What is the function of the opening scene with the witches in scene I act 1?

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lmillerm eNotes educator| Certified Educator

The witches set the play in motion. The first scene in Act I introduces the witches and shows that they intend on meeting with Macbeth. When the witches meet with Macbeth in Act I, scene 3, they reveal their premonitions, which inspires Macbeth and Lady Macbeth to go forth with their murderous plans in order to make the witches' prophesies come true.