The context clues show that Caliban spoke in blank verse because he attempted to violate the daughter of Prospero.
Context clues are the hints that are given in a literary work. Blank verse means the unrhyming verse that's written in iambic pentameter.
In this case, Caliban spoke in blank verse because he attempted to violate the daughter of Prospero. This was a reflection of the fact that Miranda taught him to speak.
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