AP® English Literature and Composition · Fixed Forms: Closed, Open, and What the Form Itself Argues
3.C The Shakespearean Sonnet: Three Quatrains and a Couplet
A Shakespearean sonnet stacks three four-line arguments (ABAB CDCD EFEF) and then closes with a rhymed couplet (GG) that gets the last word, whether that word agrees, qualifies, or reverses everything before it.
The form is fourteen lines built as three quatrains plus a couplet, rhyming ABAB CDCD EFEF GG. Each quatrain usually tries a different approach to the same problem: a new comparison, a new piece of evidence, a new angle of attack. That is why the poem feels like three separate arguments rather than one steady build: the speaker is circling the subject, testing it from different sides, before the couplet steps in to close the case.
The couplet's power comes from timing. After twelve lines of accumulation, two rhymed lines land with the full weight of being last. That weight does not force agreement. A couplet can affirm the quatrains, as in 'Shall I compare thee to a summer's day,' where the three quatrains catalog summer's flaws and time's damage, and the couplet answers that the poem itself will outlast time, giving the beloved life. But a couplet can just as easily undercut what came before, as in 'My mistress' eyes are nothing like the sun,' where twelve lines of deflating comparisons get reversed by a couplet insisting the love is rare precisely because it needs no false comparison.
This is what separates the Shakespearean sonnet from open forms discussed elsewhere in the unit: the closed form has an argument built into its architecture. Three quatrains plus a couplet is a machine for building a case and then judging it, and the judgment is never guaranteed in advance. Reading the form well means watching for the turn at line thirteen, not assuming it, because the couplet's job is to decide, not to repeat.
Key terms
- quatrain
- A four-line stanza or unit, here rhymed ABAB, CDCD, or EFEF.
- couplet
- Two consecutive lines that rhyme, here the closing GG pair of the sonnet.
- volta
- The turn in thought a sonnet takes, in this form usually arriving at the final couplet.
- closed form
- A fixed poetic structure, like the sonnet, whose rhyme and line pattern shapes how its argument must unfold.
Watch it explained
- How it worksHow do three quatrains stack a case that the closing couplet snaps shut?
- Worked exampleWalk me through the ABAB CDCD EFEF GG shape of 'Shall I compare thee to a summer's day'.
- Worked exampleShow me how the couplet of 'My mistress eyes are nothing like the sun' reverses the poem.
- Common mistakeWhy isn't the closing couplet always agreeing with the twelve lines above it?
Check yourself
End of topic.