本文通过对《左传》“不”与“弗”的比较分析,认为两者的本质区别在于否定语气上的轻重强弱的不同,“弗”的否定语气强烈,对“弗”句的内容具有强调作用,语气短促有力、确定不移;“不”的否定语气轻缓,对“不”句的内容无强调作用,可表达包括询问、测度、委婉、商量等各种语气,“不”与“弗”在语法功能上的差异,无不体现出两者本质上的区别。 Through the comparison and analysis of “no” and “e” in “Zuo Zhuan”, this paper argues that the essential difference between the two lies in the negation of the different tone of tone and tone. The negation of “Fu” The tone of “no” is light and gentle. It does not emphasize the content of “no” sentences, and can express various tones including inquiry, measurement, euphemism and consultation, and “no” Differences in the grammatical functions with the “Eph” all reflect the essential differences between the two.