Shakespeare’s use of the dagger in "Macbeth" serves multiple interpretive purposes. The two correct answers that explain its use are:
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Macbeth’s sight of the dagger, which is not actually there, indicates his insanity. - The hallucination of the dagger signifies Macbeth's deteriorating mental state, reflecting his internal conflict and the moral turmoil he experiences leading up to the murder of King Duncan.
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Macbeth’s guilt for thinking about killing the king has triggered its appearance. - The dagger symbolizes Macbeth's guilty conscience and foreshadows the violent actions he is about to take, showing how his thoughts of murder manifest in a tangible form through the vision of the dagger.
These interpretations highlight the psychological dimensions of Macbeth's ambition and the consequences of his moral decline.