Each sentence is roughly seven words, and every two sentences is roughly a number. You can change the rhyme, that is, the rhyme is allowed to change. But at least two sentences rhyme, usually in the second sentence. Know the rhyming word first, two sentences are called a couplet, and the word rhymes at the end of two sentences. Changing rhyme means changing another rhyme. How to distinguish? Ask the teacher.
I remember that there are several couplets in the whole poem, and two sentences are linked together. After several couplets, it changes rhyme, and then it changes rhyme. Change the rhyme and couplet several times until the whole poem is over. After understanding the whole text and getting familiar with poetry, it is a very helpful method to count all the rhyming words in the whole poem and recite all the rhyming words in the whole poem.