Why did shakespeare noble characters speak in iambic pentameter

To show the education and refinement of the nobles.

Explanation:

Shakespeare's noble characters speak in iambic pentameter to show the education and refinement of the nobles. It is usually the aristocratic members of the play who speak in verse. Iambic pentameter sounds like poetry, it has a melodious sound. On the other hand, commoners speak in prose. In Shakespeare's plays when the commoners speak the writing goes from the beginning to the end of the line.

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