1, and the rhyme format of Shanglai is ababcdcdefefgg.
2. The first four sentences of Shakespeare's sonnets rhyme 1 and 3, and the second and fourth sentences rhyme; The last four sentences rhyme differently from the first four sentences, but these four sentences also rhyme every other sentence; The last four sentences are different from the previous rhymes, but they also require rhyming every other sentence; The last two sentences rhyme differently from the previous ones, but they must rhyme.