Answer:
Sonets can be identified in two main groups, Petrarchian (italian) sonets and Shakespearean sonets.
Shakesperean sonets use the form ABAB CDCD EFEF GG for rhyming couples, with the first 12 lines building and developing the main idea of the argument, but in the last 2 lines a turn is introduced which oftens counters the main argument.
Explanation:
These are the last 6 lines from Shakespeare's 130 Sonet:
"
...
<em>I love to hear her speak, yet well I know
</em>
<em>That music hath a far more pleasing sound;
</em>
<em>I grant I never saw a goddess go;
</em>
<em>My mistress when she walks treads on the ground.
</em>
<em />
<em>And yet, by heaven, I think my love as rare
</em>
<em>As any she belied with false compare."</em>
<em />
The first four lines follow the EFEF form of rhyme while describing the beauty in the wife's actions, but the last two lines in GG form, explores how the wife cares little for all the comparisons the author makes, leaving him doubting of his feelings.