Nothing Gold can stay

This poem is made up of four rhyming couplets (two lines that rhyme and complete a thought). What is the relationship between the lines in each couplet?

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Each couplet has a line about hope contrasted by a line that suggests disappointment.

Each couplet has a line about community contrasted by a line about loneliness.

Each couplet has a line about nature contrasted by a line about humanmade artifacts.

Each couplet has a line about beauty and impermanence contrasted by a line about loss and change.