With two syllables (two words) as a step, the flat tones are alternately arranged. According to the level of the first two words in the first sentence, the seven-character rhyme is divided into two parts: flat and flat. According to the law of leveling, there are four standard sentence patterns in seven-character rhyme:
1, flat and flat (flat and flat, the last word is flat, called flat feet).
2, flat and flat, flat and flat (flat and flat, the last word is flat and flat, called flat and flat feet).
3. Flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat
4. Flat (flat, the last word is flat, so it is called flat feet). These four sentence patterns are the basis of the change of the flat and flat format of the regular poem, and constitute the four basic formats of the seven-character regular poem.
Seven-character metrical poetry refers to seven-character and eight-sentence poetry, which conforms to the norms of metrical poetry. Referred to as "Seven Rhymes", it is a kind of metrical poem. Metric poetry belongs to the category of modern poetry, which is named because of its rigorous meter.
The rise of seven-character poems is later than that of five-character poems. It originated in the Southern and Northern Dynasties, sprouted in the new style poems of Qi and Liang Dynasties, and was shaped between the early Tang Dynasty and the prosperous Tang Dynasty. In the early Tang Dynasty, Shen Quanqi, Song, Du, Li Qiao and others began to write articles. In the prosperous Tang Dynasty, Wang Wei, Li Qi, Cen Can and Jia Zhi all made efforts to master the system, while Cui Hao and Li Bai still had mixed, semi-ancient and semi-French works.
Although there are some masterpieces of Gao Hua Xiulang in the seven-character poems of this period, most of them belong to the content of giving and receiving, which is narrower than the five-character poems. At the same time, in the prosperous Tang Dynasty, most of the seven laws of poets such as Li Bai, Wang Wei and Gao Shi were wrong, sticky and emphasized. It was not until Du Fu that the seven-character rhythmic poem showed its poetic potential and opened up the artistic world.
Du Fu opened up the realm of metrical poetry in an all-round way, and current affairs, politics, life experiences, customs, cultural relics and historical sites were all integrated into strict metrical style, which raised the value of this poetic style to the level of being juxtaposed with ancient poems and quatrains.
From Du Fu to the Middle Tang Dynasty, the seven-character law system failed to innovate. Seven-character rhythmic poems in the late Tang Dynasty opened up a new situation. Wen, Li Shangyin, Du Mu and other Seven-Rhythm Masters not only trimmed the form of Seven-Rhythm Poems, but also reformed the rhythm of Seven-Rhythm Poems, pushing the art of Seven-Rhythm Poems to a new stage.