Stanza 3
And the silken, sad, uncertain rustling of each purple curtain

Thrilled me- filled me with fantastic terrors never felt before;

So that now, to still the
beating of my heart, I stood reapeating,

"Tis some visitor entreating entrance at my chamber
door-

Some late visitor entreating entrance at my chamber
door-

                                            That it is and nothing
more."
KEY:
bold: alliteration
alliteration: internal rhyme
underlined: rhyme
Description
During this stanza, we know there is a storm going on because the stanza states, " and the silken, sad, uncertain rustling of each purple curtain", which means that there is a strong wind outside blowing the curtains around. Also, when it says, "Thrilled me- filled me with fantastic terrors never felt before", it means that the speaker is thrilled and scared at the same time because he thinks it's Lenore making that tapping, but realizes it's impossible because she's dead.
In this stanza, we can see the first alliteration of the poem. It is stated in the first line of the stanza. The "s" sound is pronounced a lot when he says the words
silken, sad, and uncertain together.  
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