How is the Italian sinner different from the Shakespearean sonnet?

It seems there might be a confusion in the term "Italian sinner." I believe you might be referring to the "Italian sonnet" and comparing it to the "Shakespearean sonnet." Let me provide information on both poetic forms:

1. Italian Sonnet (Petrarchan Sonnet):

  - Structure: The Italian sonnet consists of 14 lines divided into an octave (8 lines) and a sestet (6 lines).

  - Rhyme Scheme: The rhyme scheme of the octave is typically ABBAABBA, and the sestet can vary (CDCDCD or CDECDE, for example).

  - Volta: There is often a volta, or a thematic shift or turn in thought, between the octave and sestet.

2. Shakespearean Sonnet:

  - Structure: The Shakespearean sonnet also consists of 14 lines but is divided into three quatrains (4-line stanzas) and a final rhymed couplet (2-line stanza).

  - Rhyme Scheme: The rhyme scheme is ABABCDCDEFEFGG.

  - Volta: Similar to the Italian sonnet, there is often a volta, typically occurring at or around the ninth line, signaling a shift in theme or argument.

The key differences between the two sonnet forms lie in their structure, rhyme schemes, and the placement of the volta. The Italian sonnet's octave and sestet structure allows for a more distinct separation of thematic elements, while the Shakespearean sonnet's quatrains and couplet structure offers a different progression of ideas.

If there was a specific reference to an "Italian sinner," and you meant something different, please provide more context or clarification, and I'll do my best to assist you.