Question

Why is the iambic pentameter particularly useful in Shakespeare's drama Macbeth

Answer 1

It showed how refined his characters were. It tended to show a more eloquent way of speaking. The way iambic pentameter  works is a combination of 5 stressed and 5 unstressed syllables its almost chant like which shows the witch sisters almost hypnotic way of speaking. It allows us to know they are witches.
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Answer 2

Answer:

In a drama, the lines are spoken aloud, and this meter follows the natural voice pattern

Explanation: