Shakespeare chose to write Macbeth in iambic pentameter for a natural, lyrical flow and to indicate the class of characters speaking.
Iambic pentameter is a poetic meter consisting of five sets of iambs, which are pairs of unstressed and stressed syllables. Shakespeare chose to write Macbeth in iambic pentameter to give the play a lyrical flow to make it more appealing to the ear, as well as to signal the class of the characters speaking.
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