Final answer:
No, 'My Last Duchess' by Robert Browning does not use heroic couplets. The poem employs a consistent rhyme scheme throughout, but it does not feature the end-stopped rhymed pairs of lines that are characteristic of heroic couplets. The narrative voice and the addressee remain consistent throughout the poem.
Step-by-step explanation:
The poem 'My Last Duchess' by Robert Browning does not use heroic couplets. Heroic couplets are pairs of rhymed lines in iambic pentameter, which were especially popular in the 17th and 18th centuries. 'My Last Duchess' is written in a different form, known as a dramatic monologue, and the rhyming scheme is not that of couplets.
Instead, the poem uses a single, continuous rhyme scheme throughout, rather than the end-stopped rhyming pairs characteristic of heroic couplets. The rhyming pattern is more subtle and does not conform to the traditional heroic couplet structure. Furthermore, the poem is written in unbroken iambic pentameter lines that do not pair up into couplets with end-stop punctuation, differing from the structure used by poets like Alexander Pope in his heroic couplets.
Regarding the voice and audience within the poem, the speaking voice does not change; it remains the Duke's throughout. Similarly, the person being addressed also remains the same, suggesting a consistent narrative voice rather than the shifts that might occur in other poetic forms.