How to distinguish left and right couplets from upper and lower couplets? You can tell the difference by observing the left and right sides of the horizontal link.
1, the writing method of the horizontal couplet is from left to right. Then couplet left couplet, right couplet.
2. The writing method of horizontal couplet is from right to left. Then couplets are right couplets and left couplets.
3. The last word of the couplet is the couplet. Generally speaking, it is three or four tones, and the last word is flat tone, which is the bottom line, usually one or two tones.