Assertion: sonnet's couplet | /r/CapableOf | serve one of three purposes
Facets:
value: to offer a reason
type: PURPOSE
value: often
type: TEMPORAL
Source sentences:
text: The couplet of a sonnet often serves one of three purposes: to offer a reason to confirm what has gone before, to follow through and complete the current idea, or to contradict or modify the quatrains.