In one to two sentences, explain the central idea of the final couplet of the poem.

The question is referring to well-known Sonnet 18 of William Shakespeare, which is about the comparison of humankind and his poems, or all about beloved ones. The poet summarized the power and stability of love.

The final couplet of the poem by William Shakespeare is:

"So long as men can breathe or eyes can see,

So long lives this and this gives life to thee."

The central idea of the couplet is: the poet William Shakespeare is saying that as long as people will live, his written poetry will also live on. This ensures the immortality and life of his lovers for his poems.

The poet denotes immortality as the ability of people to live forever.

The poet compares the life of his poems with the infinite life of human beings.

To know more about Sonnet 18, refer to the link:

link

Explanation:

A. perception that the nighttime wind is alive