“A也不是，B也不是”是现代汉语中的一种常用句式，该句式的前后两项形式上对称，A、B的语义通常相反或相对。对举反义聚合的两个极端项，概括该范畴所有可能的行为或状态，通过“不是”否定了极端项，从而达到全量否定的效应。经历时考察发现，“A也不是，B也不是”最早出现于宋代，元明时期产生了“A又不是，B又不是”和“A不是，B不是”两种变体，进入明清句式逐渐稳定，句式义也日益凝固，体现话语主体左右为难、无所适从的心理状态。

“A ye bushi（也不是）, B ye bushi（也不是）” is a widely used sentence pattern in modern spoken Chinese. This sentence pattern has a simple structure and a fixed construction meaning. The former part and the latter part of the sentence pattern represent symmetry and cohesion. This paper intends to give this sentence pattern an intensive analysis, including structure, meaning and function. A description will also be given of the emergence and development process from the diachronic aspect, trying to use Cognitive Linguistic theories to explain the mechanism of the sentence pattern’s creation and evolution.