As has already been stated, this poem is a sonnet; like all sonnets, it is made up of fourteen lines. It's divided into two sections, the first of which is eight lines and the second of which is six, maintaining a rhyme scheme of A-B-A-B-C-D-C-D-E-F-E-G-F-G.
However, when speaking about poetry, one needs to talk about meter (especially when discussing traditional poetry) because meter tends to be one of the most important elements that dictates a poem's construction. Traditional poetry tends to be very rhythmic, and it is shaped by very specific rules (free verse poetry is, in many ways, a reaction to these rules). Sonnets are frequently written in iambic pentameter, and this poem is no exception.
Traditional poetry is divided into feet (the combination of two or more metered syllables), the most common of which is the iamb. An iamb...
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