What is a quatrain? It originated from the short chapters of Yuefu in the Han, Wei and Six Dynasties, and its name may come from the "couplets" written by literati in the Six Dynasties. According to the literature, there was a custom of writing poems in the banquets of literati in the Six Dynasties, and each person wrote four sentences and five words to synthesize a whole poem. If you cut off what everyone has done and do a separate article, it is called "unique skill", and the name of the quatrains comes from this.
According to the number of words in each sentence, quatrains can be divided into five-character quatrains, six-character quatrains and seven-character quatrains. There are many five-character quatrains, few seven-character quatrains and few six-character quatrains. According to the strict degree of metrical requirements, it can be divided into two categories: absolute and ancient.