Flat: it is mostly used in couplets, and the words in couplets should have their meaning, rhyme and flatness.
Three-character couplets: flat and parallel.
Four-character couplets: flat and light, flat and light.
Five-character couplets: Pingping, Pingping, Pingping, Pingping, Pingping, Pingping, Pingping and Pingping.
Six-character couplets: flat, flat, flat.
Seven-character couplets: flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat flat.
Eight-character couplet: flat, flat, flat.
Extended data
The leveling theory is like dividing the students in four classes (four tones) into two categories (leveling) according to gender. As for whether this division is even, it is not considered by levelers.
Four tones, here refers to the four tones of ancient Chinese. If you want to know the four tones, you must first know how the four tones are formed. So let's start with the tone.
Tone is the characteristic of Chinese (and some other languages). The tone of Chinese is composed of the ups and downs and the length of the voice, and the ups and downs are the main factors. Take Putonghua as an example, * * * has four tones: the flat tone is Gao Pingtiao (it is called flat if it doesn't rise or fall); The upper voice is a rising tone (not high or low); The rising tone is a low rising tone (sometimes a low flat tone); Voiced is a high tone.
Ancient Chinese has four tones, but it is not exactly the same as Mandarin today. The ancient four tones are:
(1) level, which is divided into level and level.
(2) The rising tone, which will become a part of the falling tone in later generations.
(3) De-voiced, whether this tone will be de-voiced to future generations.
(4) Entering tone, which is a short tone. Modern Jiangsu, Zhejiang, Fujian, Guangdong, Guangxi, Jiangxi and other places still preserve the milk sheng. There are also many places in the north (such as Shanxi and Inner Mongolia) where raw milk is preserved.