In order to distinguish the upper and lower couplets clearly, we must first understand the knowledge of Pingze.

In short, how to judge couplets depends on the last word of couplets. If the last word is a vowel (the third and fourth sounds of pinyin), it is a couplet; If the last word is a flat and voiced word (the first and second sounds of pinyin), it is the bottom line; Then when posting couplets, the first couplet is posted on your right hand side facing the gate, and the second couplet is posted on your left hand side facing the gate. See the figure below for details:

Couplets are divided into upper and lower couplets. How to judge them according to the last sentence? If we went to primary school, we should know that there are four pronunciations in Mandarin, namely the first, second, third and fourth tones. Take "A" for example, they are "ām÷". The ancients called the first sound "Pingsheng" and called the second sound "Pingsheng". The third sound is called "Shangsheng" and the fourth sound is called "Xu Sheng", which are collectively called "Xu Phonon". Modern people's pronunciation is different from that of the ancients. Modern people are the four tones I just mentioned, and the standard is Xinhua Dictionary. There were five tones in ancient times. In addition to the four tones of modern Mandarin, there is a special pronunciation called Rusheng, which is short and narrow. According to different standards, different dynasties have different corresponding rhyme books, such as Pei Wen Shi Yun, Qi Yun, Guang Yun and Ping Shui Yun. Now it has been classified as four tones in modern Chinese, and only some local terms such as Cantonese remain. Therefore, the pronunciation of modern people is abbreviated as "new sound and new rhyme"; The pronunciation of the ancients was abbreviated as "old sound and old rhyme"

Therefore, to distinguish the upper and lower couplets, we should at least understand the elegance of each word. As far as new rhyme is concerned, we should be familiar with Xinhua Dictionary. Couplets are divided into upper and lower couplets, one is called sentence and the other is called dialogue. Two principles must be followed. First, the couplet is based on the level of the last word. The upper couplet means that the last word is usually flat and turbid, and the lower couplet means that the last word is usually flat and turbid, with few exceptions;