Couplet knowledge: clear pronunciation and mellow voice, consistent sentences. The number of words in the upper and lower couplets must be the same, not more or less. Generally, the same word can't appear unless the position of a word is deliberately vacated to achieve some effect. Plain, harmonious tone. In modern Chinese, all words belonging to Yang Ping are "Ping", and all words belonging to Shang Sheng and De Sheng are "Xu". Generally speaking, the last word of the couplet is pronounced in a flat voice, commonly known as "flat"
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Content related. Couplets not only require duality, but also the contents of the upper and lower couplets must be interrelated, so as to set off each other and form a sharp contrast, and express the same theme with * * *, so as to achieve the effect of complementing each other or opposing each other and form an organic whole. Of course, the upper and lower couplets cannot "cross hands", that is, the upper and lower couplets cannot express the same meaning. For example, the Spring Festival couplets, which are generally old shops, "have a prosperous business and are spread all over the world; Sanjiang is rich in financial resources. "A pair of couplets, straightforward and neat, are very popular with business people.