How to distinguish ancient poetry from regular poetry and quatrains

Rhyme and quatrains are not ancient poems, but modern poems in ancient poems. Ancient poetry is divided into two categories, one is ancient poetry, the other is modern poetry. Modern poetry includes metrical poems and quatrains. Classical poetry, also known as ancient poetry and ancient style, has four words, five words, six words, seven words and miscellaneous words. Later generations often use five words and seven words. Five characters are referred to as "five ancient" and seven characters are referred to as "seven ancient". Classical poetry does not limit the number of sentences, does not seek antithesis, and does not talk much about leveling, so the rhyme is more free. Compared with classical poetry, modern poetry came into being later, originated in the Southern Dynasties and matured in the early Tang Dynasty. Among them, the metrical poems are fixed in form and rigorous in meter, with eight sentences each. A single sentence is called antithesis, and a double sentence is called antithesis. Together, they are called couplets. One or two sentences are called first couplet, three or four sentences are called parallel couplet, five or six sentences are called neck couplet, and seven or eight sentences are called tail couplet. Parallel couplets and necklaces are generally antithetical. The first sentence can rhyme but not rhyme, usually the rhyme is flat. Five words are called "Five Laws", seven words are called "Seven Laws", and more than ten sentences are called "Exclusion Law". Among them, quatrains are also called quatrains and quatrains. It seems that half of the metrical poems are intercepted, each with four sentences. As far as its specifications are concerned, some of the couplets behind it are antithetical, similar to the first couplet and parallel couplet of regular poems; Some of the front couplets are antithetical, similar to the neck couplets and tail couplets of rhythmic poems; Some of the couplets are antithetical sentences, similar to the couplets and necklaces of metrical poems; Some don't have to type, similar to the first and last couplet of rhyme. The rhyme of a quatrain is two or four sentences, usually flat rhyme. If the first sentence rhymes, it is also flat. There are two kinds of quatrains: five-character quatrains and seven-character quatrains, which are referred to as "five-character quatrains" and "seven-character quatrains" for short.