1. When facing the gate, the right hand direction is upper paste, and the left hand direction is lower paste and lower paste.
2. According to the tone, the last word in the upper part is three or four tones, and the last word in the lower part is one or two tones.
According to cause and effect, the first cause is the consequence.
According to time, the first pass is the upper part, and the second pass is the lower part.
5. According to the spatial scope, the front is small and the back is big.