Answer: The main difference between a Shakespearean sonnet and a Petrarchan sonnet is the way the poem's 14 lines are grouped. Rather than employ quatrains, the Petrarchan sonnet combines an octave (eight lines) with a sestet (six lines) so the answer is an octave & sestet. Hope this helps :)
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It could add a more intereasting point of veiw.
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Thats all I got sorry
 
        
             
        
        
        
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Determine size (by counting lines and spaces between the notes)
Determine if the top note is in the major scale of the bottom note.
If it is: the interval is perfect (if it is a unison, fourth, fifth, or octave) or it is major (if it is a second, third, sixth, or seventh)
 
        
             
        
        
        
I believe so because there were pieces like Gregorian chants.