How to analyze the form of ABCD, a rhyme scheme in English poetry, and how to judge it? Thank you very much for your advice!

"Rhyme scheme ABCD" refers to the rhyme of English metrical forms, such as Dalai style (14 line), folk style and so on. The rhyme format of Shakespeare's sonnets is ababccdcd efefgg, which means that the first four sentences of Shakespeare's sonnets rhyme with 1 and 3, and the second and fourth sentences rhyme with each other. 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. I don't think the poem you listed above is a metrical poem, but what we call a free poem, and there is no fixed rhyme relationship. When we write our own free verse, which is what many people call modern poetry, there are no prosodic rules.