Which is an example of a couplet from shakespeare's "sonnet 18"?
shall i compare thee to a summer's day?
thou art more lovely and more temperate:
o sometime too hot the eye of heaven shines,
and often is his gold complexion dimm'd,
but thy eternal summer shall not fade,
nor lose possession of that fair thou ow'st,
so long as men can breathe or eyes can see,
so long lives this, and this gives life to thee.