Foreshadowing in Friar Laurence's warning serves to engage the audience, create suspense, and provide a clue about future tragic events.
Foreshadowing in Friar Laurence's warning to Romeo serves to keep the audience engaged by suggesting more potential conflict in the story, creates suspense as the reader wonders why the warning is given, and provides a clue that something tragic will happen to the lovers later in the story.
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