To accurately compare the poetic elements in "Sonnet 18" and "Sonnet 43" by William Shakespeare, the two correct statements are:
- Both consist of a single stanza of fourteen lines.
- Both use similes and personification.
The other statements are not accurate in the context of these sonnets. For example, "Sonnet 18" follows the typical Shakespearean rhyme scheme (ABABCDCDEFEFGG), while "Sonnet 43" follows the Petrarchan rhyme scheme (ABBAABBACDCDCD). Additionally, the lines of both sonnets do not adhere strictly to iambs with five syllables per line (iambic pentameter typically denotes ten syllables, not five). Finally, while "Sonnet 18" ends with a rhyming couplet, "Sonnet 43" does not.