1, words are equal and sentences are consistent. In addition to deliberately leaving a place for a word to achieve a certain effect, the number of words in the upper and lower couplets must be the same, neither more nor less.
2. Be straightforward and have a harmonious tone. The traditional habit is to "pucker up and fall flat", that is, the end of the last sentence of the first couplet is puckered up and the end of the last sentence of the second couplet is flat.
3. Parts of speech should be relative and in the same position. It is generally called "virtual to virtual, real to real", which means that nouns to nouns, verbs to verbs, adjectives to adjectives, quantifiers to quantifiers, adverbs to adverbs and related words must be in the same position.
4. Be content-related, from top to bottom. The meaning of up and down links must be interrelated, but they cannot be repeated.
In addition, the traditional practice of hanging couplets must be written straight and pasted vertically, from right to left and from top to bottom, and cannot be reversed. The horizontal criticism closely related to couplets can be said to be the title and center of couplets. Good reviews can make the finishing point and complement each other in couplets.
Extended data:
The uniqueness and universality of couplets
It is generally believed that couplets are the most unique literary form in China. What is unique about it? Mainly in structure and language. Couplets can be called "dual structure" style. Standard couplets always consist of two opposing parts. The former part is called "Lian", which is also called "sentence", "antithesis" and "antithesis". The latter part is called "bottom link", which is also called "antithesis", "antithesis" and "antithesis". These two parts are paired.
Of course, many couplets, especially those written and hung, have horizontal comments in addition to the upper and lower couplets.
Horizontal criticism is an organic part of this kind of couplets, which is often a summary, the finishing touch or compatible with couplets. Generally, it is four words, but also two, three, five and seven words. From the linguistic point of view, the language of couplets is neither a verse language nor a prose language, but a special language that pursues antithesis and richness.
The special "language structure" of couplets is completely determined by the special nature of Chinese and its characters. The uniqueness of this "language structure" makes the creation of couplets different from other literary forms in conception, conception, layout and writing.
With the same objective object and content, we always try to observe and describe things from two aspects and angles, and strive to "shape" the language into a binary and symmetrical structure.
Baidu encyclopedia-couplets