本文从预设,语义逻辑、深层结构关系等方面,对比分析了“除非”条件句的几个句型之间的异同,并讨论了它们之间的内在联系,发现各句型之间有的是同义异构关系,有的是同构异义关系,有的是由其它两个句型整合而成等等。 This article compares and analyzes the similarities and differences between several sentence patterns of “unless ” conditionals in terms of presuppositions, semantic logic and deep structure relations, and discusses the internal relations between them and finds that among the sentence patterns Some are synonymous with heterogeneity, some are allomorphism, some are formed by the integration of the other two sentences and so on.