Final answer:
Shakespeare synchronized Duncan's comment on the recently executed Cawdor with Macbeth and Banquo's arrival to create dramatic irony and foreshadow future events.
Step-by-step explanation:
Shakespeare synchronized Duncan's comment on the recently executed Cawdor with the arrival of Macbeth and Banquo to create dramatic irony and foreshadow the events to come. By having Duncan praise the previous Thane of Cawdor, who betrayed him, it heightens the suspense and irony as Macbeth will also betray Duncan. This technique engages the audience and adds complexity to the story.
Learn more about Shakespeare's use of synchronization in Macbeth