The concepts of ancient poems, ancient poems, ancient styles, modern poems, metrical poems, metrical poems and quatrains.

Ancient poetry: in a broad sense, it refers to ancient poetry. Ancient poetry in a narrow sense is ancient poetry.

Classical poetry: including ancient poetry (poems before the Tang Dynasty), Chuci and Yuefu poems. Poems in ancient poetry genres such as Song, Gexing, Quotations, Qu and Ling are also ancient poems. Classical poetry does not talk about antithesis and rhymes freely. The development track of classical poetry: The Book of Songs → Chu Ci → Han Fu → Han Yuefu → Wei, Jin, Southern and Northern Dynasties Folk Songs → Jian 'an Poetry → Tao Poetry and other literati five-character poems → Tang Dynasty Ancient Style New Yuefu.

Antique: After the Tang Dynasty, poets wrote classical poems, which were often called "antique" or marked "antique" in the title, as opposed to metrical poems.

Modern poetry: Modern poetry, also called modern poetry, is a kind of metrical poetry formed in the Tang Dynasty. There are two kinds, and there are strict rules on the number of words, sentences, level tones and rhymes.

Metric poetry: that is, modern poetry.

The quatrains, each with four sentences, are called five words for short and seven words for short. A quatrain is just a two-sentence, four-sentence antithesis, also known as quatrains, truncated sentences and broken sentences. There are certain requirements for parallelism, rhyme and duality.

"Rhyme" has eight sentences, five words and five methods, and seven words and seven methods. More than eight sentences are called excluded law (or long law). The rhythm is very strict. There are definite sentences (except arrangement), definite characters in sentences, definite rhymes (definite rhymes), definite tones (definite tones of each word in the poem) and definite couplets (the two rhymes in the middle must be aligned). For example, verse poems originated in the Southern and Northern Dynasties and matured in the early Tang Dynasty. Each poem has four quadruples and eight sentences, and each sentence must have the same number of words, which can be four rhymes or five rhymes. The two couplets in the middle must face each other. Two, four, six and eight sentences rhyme, and the first sentence can be put or not. If the arrangement is extended to more than ten sentences on the basis of fixed rhythm, it is called arrangement. In addition to the antithesis of the first and last couplets, there are also antitheses, which are called "model pairs".