在涪陵话口语里表假设义的“是”可以在句首单独做连词,也可以与助词“的话、噻”构成“是…的话、是…噻”格式,还可以重叠在假设连词前面,构成双用或多用式。本文在描写的基础上,对“是”表假设义的来源进行了一些探讨。并论证了单用的“是”与“假如是、如果是”中的“是”不同,前者是一个词,后者是一个词内成分。 In the Fuling dialect, the “” is defined as “can ” in the sentence alone to do conjunctions can also be with the auxiliary word “, then ” constitute “is ..., is ... Thi ” format can also overlap In the hypothetical conjunctions in front, constitute dual or multi-purpose. Based on the description, this article makes some discussions on the source of the definition of “” And argued that the single “” is and “If it is, if it is ” is "is different, the former is a word, the latter is an in-word component.