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Poetic form · Strict closed forms · Italian / English

Sonnet.

A sonnet is a fourteen-line poem typically written in iambic pentameter, which consists of ten syllables per line with alternating unstressed and stressed beats. This structural framework has remained surprisingly consistent for around five centuries, even as poets have creatively adapted it.

2 poems indexed2 annotatedPublic-domain corpus

Tradition

Two primary forms stand out. The Petrarchan (Italian) sonnet divides into an eight-line octave (rhyming ABBAABBA) and a six-line sestet (rhyming CDECDE or a variation). The Shakespearean (English) sonnet features three quatrains followed by a closing couplet, rhyming ABAB CDCD EFEF GG. A third option, the Spenserian sonnet, connects the quatrains through interlocking rhyme: ABAB BCBC CDCD EE. In all three forms, there is a turn — the volta — which shifts the poem's argument, emotion, or perspective. In the Petrarchan form, the turn occurs between the octave and sestet, while in the Shakespearean form, it usually appears in the final couplet.

The sonnet began in thirteenth-century Sicily, was refined in Italian by Petrarch, and made its way into English through Wyatt and Surrey in the sixteenth century. Notable poets like Shakespeare, Spenser, Sidney, Donne, Milton, Keats, along with later figures such as Hopkins, Millay, and Brooks, have all embraced it. The form endures because its constraints are creatively productive rather than merely ornamental: fourteen lines provide enough space to develop an argument while being brief enough to require conciseness. The volta compels deeper reflection — you can't just describe something; you need to engage with it.

Anatomy & implementation

How it lands.

OpeningSonnet 18

Shall I compare thee to a summer's day? Thou art more lovely and more temperate: Rough winds do shake the darling buds of May, And summer's lease hath all too short a date:

Why it works

This opening quatrain follows the traditional Shakespearean ABAB rhyme scheme, with 'day / May' and 'temperate / date' establishing the pattern, while each line maintains a loose iambic rhythm of ten syllables. Shakespeare kicks things off with a question—a classic technique that introduces the volta—and quickly undermines the comparison he just made. The brevity here is key: in just four lines, he presents a thesis, introduces a doubt, and pushes the argument into the next quatrain.

Closure_On first looking into Chapman's Homer._

Then felt I like some watcher of the skies When a new planet swims into his ken; Or like stout Cortez when with eagle eyes He star'd at the Pacific — and all his men Look'd at each other with a wild surmise — Silent, upon a peak in Darien.

Why it works

This sestet is where Keats makes his shift. The octave lists familiar literary territory already covered; here the poem transitions into pure feeling — the stunned silence of discovery. The Petrarchan sestet (CDCDCD) allows Keats to extend the poem over six lines instead of wrapping it up quickly with a couplet. The last line, which is end-stopped and made up of a single syllable, carries its significance because the structure has been leading up to this moment of complete stillness.

How to spot sonnet

  1. Count the lines. A sonnet consists of exactly fourteen lines. No more, no less.
  2. Check the meter. Most sonnets are written in iambic pentameter — ten syllables with five stresses, following a da-DUM pattern. While there are variations, a strong iambic rhythm is the standard.
  3. Map the rhyme scheme. ABAB CDCD EFEF indicates a Shakespearean sonnet. ABBAABBA with a variable sestet points to a Petrarchan sonnet. Interlocking ABAB BCBC CDCD EE suggests a Spenserian sonnet.
  4. Look for the volta. Identify where the poem shifts — whether in argument, tone, or imagery. In a Petrarchan sonnet, this typically occurs at line 9. In a Shakespearean sonnet, it often appears at line 13, marking the beginning of the couplet.
  5. Notice the closing couplet (or lack of one). A rhymed couplet at the end strongly indicates the English tradition. A sestet without a couplet points to the Italian model.
  6. Feel the compression. Sonnets encapsulate a complete thought — presenting a problem, a turn, and a resolution — within a limited space. If a fourteen-line poem feels like a self-contained argument, you are likely looking at a sonnet.

How to write sonnet

  1. Choose your architecture first. Decide if you prefer the Shakespearean model (three quatrains plus a couplet) or the Petrarchan model (an octave followed by a sestet). This choice influences where your volta will fall, making it a structural decision rather than just a decorative one.
  1. Find your argument. A sonnet needs a problem to explore — think of a contradiction, a question, or a tension between two ideas. For example, "I love this person, but time destroys everything" is a solid sonnet argument. A simple description won’t suffice.
  1. Draft in quatrains (or octave), not lines. Treat each quatrain or octave as a complete block of thought, then move on to the next one. Writing line by line while trying to manage rhyme and meter can lead to forced or awkward syntax.
  1. Tackle the hardest constraint: the closing couplet. In the Shakespearean form, the couplet should deliver the poem's turn without sounding like a greeting card. Experiment with several versions. A couplet that merely sums up the preceding lines misses the mark; it should reframe, complicate, or clarify.
  1. Set the meter loosely at first. Begin by writing in the rhythms of natural speech, then refine it toward iambic pentameter. It’s normal to make substitutions — like starting a line with a trochee or using a feminine ending. Focus on creating a pulse, not a rigid metronome.
  1. Place your volta deliberately. Clearly mark the line where the poem shifts. If you can't identify it, the poem hasn’t turned yet, and you should return to build the necessary tension for a turn.
  1. Read it aloud. Sonnets are meant to be heard. If a line stumbles, it indicates that the meter needs some adjustment.

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Inquiries

What is the volta, and do I have to use one?

The volta is the turn — the moment when the poem shifts in its argument, emotion, or perspective. It's essential for crafting a successful sonnet. Without a volta, you're left with fourteen rhymed lines, which doesn’t qualify as a sonnet. The turn doesn’t need to be dramatic; it can be quite subtle. However, there must be some change between the setup and the resolution.

What is the difference between a Petrarchan and a Shakespearean sonnet?

Structure and where the turn lands. The Petrarchan sonnet divides into an 8-line octave (ABBAABBA) that sets up a situation or problem, followed by a 6-line sestet (CDECDE or similar) that addresses it. The Shakespearean sonnet is structured as three quatrains (4+4+4) that gradually develop an argument, culminating in a two-line closing couplet (GG) that presents the turn and resolution. The Petrarchan form allows for more flexibility in the sestet, while the Shakespearean form creates significant tension in those final two lines.

Do I have to write in iambic pentameter?

Strictly speaking, no — poets have crafted sonnets in hexameter (like Sidney), in free verse (as seen in Ted Berrigan's The Sonnets), and various other meters. However, iambic pentameter is so ingrained in the history of the form that straying from it is a choice that won't go unnoticed by readers. If you create a fourteen-line poem in free verse, some readers might label it a sonnet while others may disagree. If the meter is important to you, get comfortable with the iambic pulse; if the argument and the volta take precedence, choose the rhythm that best suits your language.

Who are the most important sonneteers in English?

Shakespeare wrote 154 sonnets, while Sidney is known for Astrophil and Stella, Spenser for Amoretti, and Donne also plays a significant role as anchors of the Elizabethan and Jacobean eras. Milton expanded the sonnet form to explore political and religious themes. During the Romantic period, Keats and Wordsworth became key figures. In the twentieth century, Edna St. Vincent Millay introduced a modern voice to the form, and Gerard Manley Hopkins, from the late Victorian era, transformed it nearly beyond recognition with his unique sprung rhythm.

What is a Spenserian sonnet?

Edmund Spenser's variation connects the three quatrains using interlocking rhyme: ABAB BCBC CDCD EE. The B rhyme from the first quatrain turns into the A rhyme of the second, and this pattern continues. This results in a more cohesive, flowing structure compared to the Shakespearean model, where each quatrain stands alone with its own rhyme. The interlocking scheme is trickier to implement in English due to the limited number of rhyming words compared to Italian.

What are the most common mistakes beginners make?

Three main issues. First, forcing rhyme at the expense of meaning — picking a word just because it rhymes instead of because it's the right fit. Second, ignoring the volta: creating a poem that expresses ideas or emotions for fourteen lines without making a shift. Third, stretching lines to reach ten syllables with unnecessary filler words ('and so,' 'indeed,' 'thus'). The solution for all three is simple: write the argument in prose first, then refine it into the poem's structure.

Can a sonnet be about something other than love?

Absolutely. The love sonnet is the most common form, but Milton tackled themes of blindness and political tyranny, Donne explored religious themes in his Holy Sonnets, Wordsworth reflected on London and nature, and Claude McKay addressed racial injustice in 'If We Must Die.' The sonnet form is like a tool for argument — it can engage with any issue that has a tension worth exploring.