Writing poems is unique.

1, flat and even (similar to ancient style, the number of ancient style sentences is not limited, you can rhyme, generally rhyme to the end, or change the rhyme halfway, five words are called "five ancient" and seven words are called "seven ancient"; It can also be used as the "ancient style" of long and short sentences. It can be divided into five words and seven words, but don't be careless or casual. For example, "Going to the Forbidden City on vacation" and "When is the source of the towering Kunlun Mountain", the first six words are all faint, and the last seven words are all plain, beautiful and full of artistic conception, but not easy to read (with the shadow of Allegro); For example, the first sentence is changed to "call friends to see the prosperity on holidays", and the second sentence is "the majestic Kunlun Mountain is famous all over the world". It seems that the artistic conception is somewhat discounted, but the latter sentence is catchy to read. It should be noted that poetry is very particular about "reading" (different from modern poetry).

2. Generally speaking, it is an ancient quatrain (she is different from the "five quatrains" and "seven quatrains", and the quatrains with uncoordinated rhythm cannot be easily marked with "X quatrains"). It is common to use rhyme (or not) in the first sentence, and rhyme must be used in the second and fourth sentences, and rhyme must be used at the end (there are usually many rhymes). For example, "plant a millet in spring and harvest 10 thousand seeds in autumn" and "people come and go on the river, but you love the beauty of perch".

Antique: more than 4 sentences (each sentence can be 5 words, 7 words, or long and short sentences, except "word"), which are uneven, can cadence, or can change rhyme in the middle (but the rhyme cannot be confused), are generally classified as "antique".

For example, Cui Hao's legalist archaism "Yellow Crane Tower":

The fairy of the past has flown away by the yellow crane, leaving only an empty Yellow Crane Tower. The yellow crane never revisited earth, there have been no long white clouds for thousands of years.

Every tree in Hanyang has become clear due to sunlight, and Nautilus Island is covered with sweet grass. But I looked home, and the twilight was getting thicker. The river is shrouded in mist, which brings people deep melancholy.

Note: It is not rigorous to classify this poem as a "seven-character poem" in 300 Tang Poems. Although this poem has been handed down from generation to generation, the first four sentences are illegal in rhyme and meter. Even though some words are flat and flexible, they still do not conform to the sentence pattern of qualified rhymes. The first couplet is the same word, but it is wrong. Compound sentence used six tones and three tones at the end of the sentence, which should be avoided. If you don't conform to the law, you will lose your rights. The last four sentences conform to the rules of flat pasting, and the fifth word of the suffix is allowed to be modified, which is basically legal. Therefore, the first half of this poem is classical poetry, and the second half is metrical poetry. Although this poem is famous, it is not suitable for imitation when writing. Strictly speaking, it should be counted as "the legalization of ancient customs."