2. Be straightforward and have a harmonious tone. The traditional habit is to curl up and fall flat, that is, curl up at the end of the last sentence and curl up at the end of the last sentence.
3. Parts of speech should be relative and in the same position. Generally speaking, it is called virtual to virtual, real to real, that is, nouns to nouns, verbs to verbs, adjectives to adjectives, quantifiers to quantifiers, adverbs to adverbs, and relational 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.
Extended data
Couplets are developed on the basis of ancient "Fu Tao" and "antithesis". The earliest Spring Festival couplets in China appeared more than 1000 years ago. According to historical records, on the eve of the Spring Festival in the twenty-seventh year of the post-Shu Dynasty (AD 964), Meng Chang, the master of the post-Shu State, was good at learning couplets on weekdays, so when the new year came, he suddenly made a decree to ask ministers to write couplets on the "Fu Tao Board" to test his talents.
As a custom, couplets are an important part of China traditional culture. In 2005, the custom of couplets was listed in the first batch of national intangible cultural heritage in the State Council, China. The custom of couplets is passed down and spread in Chinese-speaking areas and ethnic groups with cultural origins of Chinese characters, which is of great value for promoting Chinese culture.
Baidu encyclopedia-couplets