
Most commonly a sonnet will have a focused subject that is explored in the first eight lines, then in the next six lines there will be a shift or turn (“volta”) in the poem that sheds new light on the subject or shifts perspective in some fashion. Real iambic pentameter means five unstressed-stressed units (dah DUM dah DUM dah DUM dah DUM dah DUM): “shall I comPARE thee TO a SUMmer’s DAY?” Each unit may be two syllables, but not always, (“it BRILliantly SOARED” could be counted as two iambs). Beginners may count out 10 syllables per line. The more difficult Petrarchan sonnet rhyme scheme is ABBA ABBA CDE CDE, though there are many varieties of how to organize the scheme in those last six lines. These 14 letters represent the sonnet’s 14 lines and the same letter means those lines rhyme with each other.

The most common is the Shakespearean rhyme scheme: ABAB CDCD EFEF GG.
