Rhyme schemes are based on the last words of each line in the poem. In a 4 line stanza, if the first 2 lines rhyme, and the 2nd 2 rhyme, the scheme is A-A-B-B, if lines 1 & 3 and 2 & $ rhyme, the rhyme scheme is A-B-A-B. ETC...
What Is The Rhyme Scheme For Life Is Fine?