Question Below (Sonnet 130) William Shakespeare

Annotate the poem so that the sonnet's rhyme scheme is clear. Where does the scheme change-that is, where does the pattern of alternating pairs of lines whose last words rhyme(for example, in lines 1-4 "sun", "red", "dun", "head", or ABAB) shift to a different pattern? How does the poem take advantage of this shift to make meaning?