What do the absolute harmony laws in Tang poetry mean respectively? What is the difference?

We often hear that there are metrical poems and quatrains in ancient poetry, but what are metrical poems and quatrains? Is there any connection between them? Rhyme, on the surface, means that this poetry genre has very rich and colorful metrical norms, such as how many words there are, how many sentences there are, where is the level tone, how the rhyme is formed, how the two sentences are prepositioned, and so on. And quatrains, that is, truncated sentences, can also be said to mean broken sentences. They are the parts that extract the essence from metrical poems, usually two connected four sentences. Relatively speaking, quatrains are relatively simple.

First, the formation of metrical poems is different from quatrains. Rhyme is generally created directly by poets. Just like aphorisms, after determining the title and theme of the verse, it is equivalent to basically determining the framework of the verse. A poem has five words, and there are seven words in it. Five words are called five-character poems, seven words are called seven-character poems, and two sentences are a couplet. The average poem is four sentences, that is, there are always eight sentences. There are also more than eight sentences, and more than eight sentences are called xenophobia.

Second, the structure of metrical poems. Rhyme is generally divided into four parts, and every two sentences in these four parts should be strictly opposed. Let's give an example. Two orioles sing green willows, and a row of egrets go up to the sky. Two to one line, oriole to egret, singing willow to heaven. Not only that, level tone should also echo Liu and Tian relatively. However, leveling is generally not as strict as sentences. A rhyme is usually used on the rhymes of four letters and eight sentences. It is the end of the second sentence, the fourth sentence, the sixth sentence and the eighth sentence that rhymes with a tone, which is a good metrical poem.

Third, quatrains are relatively simple. A quatrain is simply a truncated sentence of a regular poem, which is a punctuation poem formed by intercepting some essence from a regular poem. The theme of metrical poetry is much simpler than that of metrical poetry, which is generally divided into four parts and four sentences, with five-character quatrains as the most. But quatrains also pay attention to antithesis and rhyme, and the last word of the second sentence and the fourth sentence should rhyme.