Which quotation from a shakespearan sonnet is a couplet

sonnet 18 no 4

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

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

The Shakespearean sonnet has the rhyme scheme ABAB CDCD EFEF GG, forming three quatrains (four lines in a group) and a closing couplet (two rhymed lines). The problem is usually developed in the first three quatrains, each quatrain with a new idea growing out of the previous one.