Why are there so many sentences in The Book of Songs?

Because poetry is originally a four-character form, and The Book of Songs inherits this form. For example, ancient lyrics such as Qingyun's songs, Kangqu's ballads and so on. , are earlier than the book of songs, are four words. After that, the language system became more and more perfect, so there were more and more words (the earliest poem was called playing a song-two words). Later, it changed from four words-five words-seven words-to Song poetry, and now it is prose.