The couplet, as stated in the question above, is a poem that presents successive lines of similar metrics, rhyming with each other and presenting basically the same number of syllables. Generally these poems have at least two lines of poetry that rhyme and may not have a limit on the number of lines. This type of poem has become very popular in English-speaking countries, as it gives more freedom for accommodation when it comes to the number of lines, but they have some difficulty regarding the number of syllables and the metric between the lines.
If the appositive phrase is needed to define the meaning of a noun then <u>don't use a comma</u>, if the appositive phrase defines enough where it can stand by it's self alone then <u>use commas around it.</u>
