What is the effect of the poetic structure used in each stanza of "the raven"? the ending rhyme scheme in the last three lines gives the poem a monotonous tone. the use of an internal rhyme scheme creates an inviting and almost playful tone. an ending rhyme scheme that repeats in the refrain gives the poem a relentless tone. the absence of rhyme at the end of the first and third lines creates a disorganized tone.