"Yu" and "Yu" are commonly used in ancient times, and they are often used as subject, object and attribute to express singular. For example, Su Shi's Shi Zhongshan Collection said that "the ancients did not bully me" (the ancients did not bully me); I cooked and ate Mencius' chapter (I cooked and ate).
"I" and "I" are common in ancient books and can be used as subject, object and attribute. Depending on the context, they can be plural. For example, "Historical Records of Xiang Yu" "Today is a knife, I am a fish, why should I quit" (others are knives and chopping boards, and we are killing fish and meat, why should we leave); Mencius Hui Liang Wang Shang "What the teacher said has a great influence on me" (what the teacher said touched me a lot and made me feel suddenly enlightened).
"I" was a general self-name before the pre-Qin period, such as Qu Yuan's Lisao, my emperor Kao Boyong (my father's name is Boyong); After Qin Shihuang, it became a special synonym that could only be used for emperors. For example, "I am the first emperor, and there are many descendants, and the second and third generations will last forever" (I am the first emperor).
"Ang" is often used in The Book of Songs, such as "Ang needs my friends regardless of whether people participate in Ang or not" (others wade across the river, but I don't, so I have to wait for my friends).
Agriculture belongs to Wu dialect and was used as the first person pronoun in Wei, Jin, Southern and Northern Dynasties.