<u>Language, sentence length, structure, and rhetorical devices</u> represent elements of an author’s style.
The writing style is the form of expression which the author uses to express his thoughts and feelings. Choice of words, sentence construction, use of figurative languages, and rhetorical devices are some of the ways through which the thoughts get to jot down on paper. The purpose of the writing style is to express a clear message to the readers and keep them engaged in it.
My guess would be each quatrain develops the problem of the poem and<span>the turn (volta<span>) comes at the beginning of the closing couplet.</span></span>