It depends which witches' scenes you are talking about. The key and most important scene is Act I Scene III, which is a scene taken from Holinshed's Chronicles, Shakespeare's source for the story. The purpose of this scene is to provide the motive power by which the story will run. It is the inciting incident of the plot. Act I Scene I is a scene designed to get the audience's attention so they will stop talking to their neighbours, pinching the orange-sellers and so on, and pay some attention to what was going on on stage. The other witches' scenes, and I include the famous Act IV Scene 1 in this, are superfluous. Their purpose is for the most part to be amusing, by portraying the witches as cutesy fairies who dance about to music and sing songs, while speaking in iambic tetrameter instead of blank verse. Act IV Scene 1 also is a pretext for including the dumb show line of kings which would help get the play past the censors, being flattering to King James.
3 witches foretold the future for MacBeth.
The purpose of the witches at the beginning of the play is to set the scene and introduce the theme of fate vs. free will that is incorporated throughout the entire novel, and it gives an idea of how Macbeth will be affected by these witches. :)
There are three witches.
She pushes MacBeth to kill the king and by doing so fulfills the witches predictions.
The witches, in Act IV Scene i
In scene 3 of act 1 in Macbeth, the external conflict arises between Banquo and Macbeth when they encounter the three witches. The witches make prophecies that spark jealousy and ambition in Macbeth, leading to a power struggle between the two friends as Macbeth becomes consumed by thoughts of becoming king.
In the beginning scene of the play "Macbeth," three witches gather to discuss their future plans.
The three witches appear in Act 1, Scene 1 and Act 1, Scene 3 of Shakespeare's play Macbeth. They meet Macbeth and Banquo on the heath and deliver prophecies that set the events of the play in motion.
the three witches
In scene 1 of "Macbeth," the witches discuss their plans to meet Macbeth on the heath after the battle is over. They mention causing trouble for a sailor's wife and casting spells on a gentleman's chestnut horse. Overall, their dialogue suggests a malicious and sinister intent.
In Act I, Scene iii of Macbeth, the witches predict that Macbeth will become the Thane of Cawdor and eventually the King of Scotland. They also prophesy that Banquo's descendants will be kings, sparking Macbeth's ambition and leading to the tragic events that unfold in the play.
Macbeth heads home to prepare his household for a royal visit. But he first sends a letter ahead, to give his wife the news of the witches' predictions. He shows up not too long after Lady Macbeth finishes reading his message [Act 1 Scene 5].