“所”字是“文言文”(中国古代正式书面语言)中最常用的汉字之一,对它的研究,每个学者都有自己的看法。这里,我想分析“所”的古代用法,并与现代用法作比较。Suǒ(所)is one of the most common Chinese characters in classical(or literary)Chinese,the written form of ancient Chinese literature.Scholars have studied the character from many different perspectives.Here I would like to focus on the usage of suǒ(所)in ancient times,and make a comparison with its usage in modern times. The word “所” is one of the most commonly used Chinese characters in “classical Chinese” (ancient Chinese formal written language), and every scholar of his study has its own opinion. Here, I want to analyze the ancient usage of “所以” and compare it with modern usage. Suǒ (所) is one of the most common Chinese characters in classical (or literary) Chinese, the written form of ancient Chinese literature. Scholars have studied the character from many different perspectives.Here I would like to focus on the usage of suǒ ( ) In ancient times, and make a comparison with its usage in modern times.