* To create a sense of mystery and fear. The witches are supernatural beings, and their cryptic language adds to their aura of danger and unpredictability. This can make the audience feel uneasy and on edge, which is perfect for a tragedy like Macbeth.
* To foreshadow the future. The witches' riddles often contain clues about what will happen later in the play. For example, when they tell Macbeth that he will be "king hereafter," they are暗示 his eventual rise to power. However, they also warn him that he will "fall down," which foreshadows his tragic end.
* To test Macbeth's character. The witches' riddles are a way for them to test Macbeth's ambition and willingness to do whatever it takes to achieve his goals. By responding to their riddles, Macbeth shows that he is willing to take risks and even commit murder in order to get what he wants.
* To add to the play's sense of ambiguity. The witches' riddles are often open to interpretation, which can add to the play's sense of ambiguity. This can make it difficult for the audience to know what is going to happen next, which can keep them guessing until the very end.
In short, the witches' riddles serve a variety of purposes in Macbeth. They create a sense of mystery and fear, foreshadow the future, test Macbeth's character, and add to the play's sense of ambiguity.