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Dramatic Irony
Explanation and Analysis—Duncan's Murder:

The discovery of Duncan's murder in Act 2, Scene 3 is an extended moment of dramatic irony. The audience is aware that Duncan is dead, but Macduff and Lennox are oblivious, an ignorance that Macbeth maintains by making comments that imply the king is still alive.

Lennox: Goes the king hence today?

Macbeth: He does. He did appoint so.

The audience knows that Macbeth is responsible for the murder, but when Macduff announces that Duncan is dead, Macbeth feigns surprise:

Macbeth and Lennox: What's the matter?

Macduff: Confusion now hath made his masterpiece.
Most sacrilegious murder hath broke ope
The Lord’s anointed temple and stole thence
The life o’ th’ building.

Macbeth: What is 't you say? The life?

When Lady Macbeth arrives on the scene, Macduff initially refuses to tell her what has happened, fearing that the news will devastate her feminine sensibilities:

Macduff: O gentle lady,
’Tis not for you to hear what I can speak.
The repetition in a woman’s ear
Would murder as it fell.

This concern is highly ironic, since Lady Macbeth was the one who planned and assisted with the killing of Duncan. In Act 1, Scene 7, she even questioned her husband's manhood when he proved reluctant to carry out the crime:

Lady Macbeth: Who dares receive it other,
As we shall make our griefs and clamor roar
Upon his death?

In the same scene, Macbeth and Lady Macbeth plan how they will pretend to react to news of Duncan's death with grief and horror:

Lady Macbeth: Who dares receive it other,
As we shall make our griefs and clamor roar
Upon his death?

As a result, in Act 2, Scene 3, the audience sees through Lady Macbeth's swooning and Macbeth's explanation for killing Duncan's guards:

Macbeth: O, yet I do repent me of my fury,
That I did kill them.

Macduff: Wherefore did you so?

Macbeth: Who can be wise, amazed, temp’rate, and furious,
Loyal, and neutral, in a moment? No man.
Th’ expedition of my violent love
Outrun the pauser, reason. [...]

In this passage, Macbeth tries to suggest that he flew into a "violent" passion that overtook his ability to see "reason." So although the other thanes believe him when he claims to have murdered the guards out of a sense of rage and loyalty, the audience knows that he did it to conceal evidence of his own crime—creating yet another instance of dramatic irony.

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