Development of conditional imperatives in Japanese: A diachronic constructional approach

This paper proposes a diachronic construction grammar analysis of the conditional imperative in Japanese to demonstrate that a constructional approach provides an effective model for language change. The Japanese conditional imperative comprises two types with distinct properties, but no study to date has successfully analyzed how the two types appeared and are related to each other. In diachronic construction grammar, language change is situated in the context of a construction as well as in relation to other constructions linked in a network. This perspective makes it a particularly beneficial model for accommodating the case in question. The construction developed in two steps, exemplifying different types of language change, both of which, however, are motivated by analogy between different constructions. Adopting the multiple inheritance analysis, I contend that the construction first emerged as a result of the reanalysis of a sequence of an imperative sentence and a subsequent sentence as a type of the conditional construction. A later development reflected another case of construction-based analogy: the daughter construction inherited the host-class expansion that occurred in the parent, and the new type emerged as a result of coercion to accommodate the expansion. Thus the development of the Japanese conditional imperative not only finds a consistent analysis in this framework, but provides valuable insight into the workings of the construction network. This paper also addresses the issues of the inheritance model, and suggests the present case argues for a model with default inheritance at the construction level, which runs counter to previous studies which have restricted the overrides of default inheritance to the level of construct.