Rhyme is one of China's modern poems, and its metrical requirements are very strict. There are three common types: five laws, seven laws and exclusive laws. Every sentence is a five-character poem. Usually eight sentences are completed, and every two sentences form a couplet, which is counted as a quadruple. It is customary to call the first couplet a title-breaking couplet, the second couplet a parallelism couplet, the third couplet a neck couplet and the fourth couplet a sentence-ending couplet. The upper and lower sentences of two or three couplets (i.e. antithesis and necklace) of each song are used to antithesis. Except for the first pair and the second pair, the couplet in the middle must be a couplet. Rhyme requires the whole poem to rhyme, and rhyme is usually balanced; The second, fourth, sixth and eighth sentences rhyme, and the first sentence can be taken or not. Allow the rhyme in a broad sense to lose its adhesion, and not in a narrow sense. There are two types: "Qi Qi" and "Pingqi". In addition, the metrical requirements of metrical poems also apply to quatrains.
For example, Du Fu's Delighting in Rain on a Spring Night:
Good rain knows the season, when spring comes.
Sneak into the night with the wind, moisten things silently.
The wild path is dark, and the river is bright.
Look at the red and wet place, the flowers in Jinguancheng are heavy.
There are many of them. Learn by yourself.