The Sonnet use rhyme scheme of abab, cdcd, efef,gg. It is believed Shakespeare addressed this sonnet to a younger lover. I believe the theme is We love something we know is going to be gone soon more than we love it in it's peak. It's the perceptive of someone that love something that he's sure gonna be eventually gone/ taken away form him.
collaboration, joint action, combined effort, teamwork, partnership, coordination, liaison, association, synergy, synergism, give and take, compromise
She went to Florida is the simple subject