“又不是X”小句是汉语口语经常使用的句子,具有相对的结构整体性。该小句判断性弱化,通过否定对方行为、观点的某一适宜性条件,进一步表明说话人自己的某种观点、看法,具有强势语气特征。文章通过对该小句的构成、内部语义关系、语用价值及辩驳语气的产生动因的分析,为第二语言学习者提供理解该小句的途径和方法。 “Not X ” clause is a frequently used sentence in spoken Chinese, with relative structural integrity. Judging from the weakness of the clause, the negative opinion of the opposite party’s behavior and the viewpoint of certain suitability conditions further indicate that the speaker’s own viewpoints and opinions have a strong tone of tone. Through the analysis of the formation of the clause, internal semantic relations, pragmatic value and motivation of the discourse, the article provides the second language learners with ways and means to understand the clause.