Shakespeare's Sonnets
15. Discuss briefly how the tone of Shakespeare's sonnets changed over time? What differences do you see in #18 as compared to #138.
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This is a pretty detailed question to be brief about. I think the tone generally becomes more cynical and bitter as the sonnets go on. Check out these themes that reflect the evolving tone.:
https://www.gradesaver.com/shakespeares-sonnets/study-guide/themes