What is the difference in the rhyme scheme of Shakespeare's Sonnet 18 from a Petrarchan rhyme scheme?

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The rhyme scheme in "Sonnet 18," as is traditional of Shakespearean sonnets, is abab cdcd efef gg . This means that the final words in lines 1 and 3 rhyme, the final words in lines 2 and 4 rhyme, the final words in lines 5 and 7 rhyme,...

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The rhyme scheme in "Sonnet 18," as is traditional of Shakespearean sonnets, is abab cdcd efef gg. This means that the final words in lines 1 and 3 rhyme, the final words in lines 2 and 4 rhyme, the final words in lines 5 and 7 rhyme, the final words in lines 6 and 8 rhyme, the final words in lines 9 and 11 rhyme, the final words in lines 10 and 12 rhyme, and the final words in lines 13 and 14 rhyme. The rhyme scheme of an Italian or Petrarchan sonnet, in contrast, patterns the first eight lines and the last six lines. The first eight lines typically follow the pattern abbaabba (though there can be some slight variation, but usually only two sets of rhymes: a and b), but variation in the last six lines is more common. They could follow the pattern cdcdcd or cdecde or cdeedc (though there are typically three sets of rhymes: c, d, and e).

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Shakespeare's sonnets are written according to the English sonnet structure that was developed during the Renaissance by poets like Wyatt, the Earl of Surrey, and Spenser. The originator of the sonnet form was Petrarch, an Italian poet who lived 200 years before the English sonnet poets.

Petrarch used a rhyme scheme that fitted his sonnet structure of fourteen lines comprised of an octave (8 lines) followed by a sestet (6 lines), with no rhyming couplet. The Petrarchan rhyme scheme was abbaabba in the octave, followed by one of several options for the sestet. Some of those options were:
cddcdc
cdeced
cdecde
cdcdcd
cdcedc

The English sonnet structure of fourteen lines was modified to fit the English language and taste. It is structured as three quatrains (4 lines) and an ending rhyming couplet (2 lines).

The English sonnet rhyme scheme fits this new structure. Shakespeare's Sonnet 18 has an English sonnet rhyme scheme that is different from the Petrarchan rhyme scheme in that each quatrain is two sets of alternating rhyming lines, which produces a rhyme scheme of abab cdcd efef followed by the rhyming couplet, which is gg.

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