William Shakespeare's Sonnet 18, "Shall I Compare Thee to a Summer's Day..." is found within the series of sonnets under the section "The Young Man" sonnets. This sonnet is one of the well-known sonnets, and essential when introducing shakespeare to students. This sonnet also is great to study poetry structure- iambic pentameter, the 14 lines, the couplet, and the rhyme scheme. Lexile measure: 1170L. (Within Grade Level.) 11-12th Grade.