The rhyme rules in ancient writing are: the principle of staggered levels and obliques; two situations are prohibited: Guping and Sanping.
The rule of rhyme is: grasp the scale of rhyme.
It is not recommended to use more than two rhymes in one word. If a word has no special requirements, it is not recommended to have rhyme changes. Unless you are a top lyricist, you can use each rhyme freely without any flaws or bluntness.
Basically, the level of poetry should not be ignored, but only the level of two, four, and six. Taking the seven-character poem as an example, that is to say, the first, third, and fifth characters of each sentence can be flat or oblique. The second, fourth, and sixth characters must abide by the rules, and the seventh character is rhyme.
We usually say that the first, third, and fifth characters can be flat or oblique, but there are two situations where they are not allowed. One is that there is only one flat character in the whole sentence, which is called Guping; The last three characters at the end all have a flat tone, which is called Sanping. These two situations are not allowed. This situation needs to be eliminated by adjusting the equality of the first, third, and fifth characters.
Extended information:
Basic rules for poetry composition:
1. Antithesis (duality): in rhymed poetry
①'Ji Cheng Zhuan He' ( (head, neck, and tail), two couplets (same part of speech, structure, and opposite), no limit to multiple pairs (rich antithesis);
② Double-neck (turn) couplets It is a wasp-waisted body;
③The pair of head and neck (starting and turning) is the pattern of stealing spring;
④ Similarity, habit, borrowing, focus, flowing water, looseness, number misplacement, separation Sentences and sentences are self-contradictory; single head, chin, and tail (start and end) combinations are incommensurable; quatrains do not require antithesis.
2. Contradiction taboos:
① Put your palms together (two antithetical couplets, the sentence structure is the same);
② The sentence has the same meaning as the couplet.
3. Relative (the upper and lower sentences are opposite): 1-2 sentences, 3-4 sentences. (Otherwise it will be incorrect)
4. Mutual adhesion (the preceding and following couplets are the same): 2-3 sentences, 4-5 sentences. (Otherwise it will lose its adhesion)
5. Five-seven variation: Add two flat or two oblique before the five-character sentence to become a seven-character poem.
Baidu Encyclopedia - Rhyme
Baidu Encyclopedia - Ping and Ze