The rhyme of couplets should be reflected. It is important to pay attention to leveling. Horizontal harmony is fundamental. Put this pair on the rhythm point. In the sentence, there must be alternation in the level and level, and the level and level are related. Three flat ends are taboo. See you at the end.

In the writing and selection of modern couplets, it is advocated that the four tones of Putonghua (Yin, Yang, Shang and Qu) should be used as the classification standard of flat tones. However, the pronunciation of some words in previous works is very different between ancient rhyme and modern rhyme. In order to fully understand their artistic conception and charm, we should master the ancient four tones (Ping, Shang, Qu and Ru).

It is allowed to create couplets with ancient four tones, but it should be noted that if the sentence indicates "using ancient rhyme", the antithetical sentence should also follow the ancient rhyme, and a couplet cannot be mixed with ancient and modern rhymes. In short, yin and yang are equal, and upper and lower are equal.

Principles of leveling in practical application;

1. The ending word of the upper link must be voiced, and the ending word of the lower link must be voiced.

2. The rhythm between the upper part and the lower part must be opposite, otherwise it is called "disharmony".

3. The words of the rhythm point cannot be changed, otherwise it is called "dislocation".