Question

read these lines from \sonnet 18\ by william shakespeare. and every fair from fair sometime declines, by chance, or natures changing course untrimmd. the purpose of these lines is to explain that beauty can fade, teach a lesson about nature, define the meaning of \fair\, argue that things never change

Explanation:

The lines mention beauty declining due to chance or nature, indicating beauty fades.

Answer:

explain that beauty can fade