The Similarities and Differences Between "Yuan " and " Yan " and Their Orbits of Developing in the Pre-Qin Period Chinese

Yuan emerged in the Jiaguwen period.During the Xizhou period,it was used as a preposition Yu,a demonstrative pronoun this and an interrogative pronoun where.Basing on these applications,it could be used as jianci and then became a conjunction.Yan emerged during the Xizhou period.Because of having the same pronunciation as Yuan,it was used as a demonstrative pronounthis,an interrogative pronoun where,a jianci and then became a mood word,an ending.During the Chunqiu Zhanguo period,it was used as a preposition Yu and then became a personal pronoun and a conjunction.