Read this stanza from "The Raven" by Edgar Allan Poe. Once upon a midnight dreary, while I pondered, weak and weary,
Over many a quaint and curious volume of forgotten lore-
While I nodded, nearly napping, suddenly there came a tapping,
As of some one gently rapping, rapping at my chamber door.
''Tis some visitor," I muttered, "tapping at my chamber door-
Only this and nothing more."
How does what happens in this stanza propel the action in the poem?
It introduces the story and sets up the coming events.
It resolves the main conflict of the story.
It gives the speaker a reason to speak to the raven.
It establishes why Lenore has left the speaker alone.

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."

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