How do you know which words in Shang Ru are "Ru" sounds?

"Shangxia" is the four tones of middle ancient Chinese in the Tang and Song Dynasties, which is the phonological origin of China's traditional phonology and the basis of the rhyme of Tang and Song Ci. Mastering the four tones and reading poems will help us appreciate the profoundness and beauty of Chinese rhythm.

There are four tones in the flat tone, and the top, bottom and tone are all flat. After the Yuan Dynasty, many northern dialects entered three tones (entering the other three tones), while Wu dialect [1]? , Jin dialect, Gan dialect, Xinxiang dialect, Cantonese, Min dialect, Hakka dialect, Jianghuai mandarin, a few southwest mandarin, and a few scattered northern dialects, with neat level tone, rising tone, falling tone and entering tone.