Yes/No Questions in Ẹ̀dó: Structure and Derivation

The aim of this paper is to explain the syntax of yes/no questions in Ẹ̀dó language. In line with its aim, the paper answers two research questions. First, what is the structure of yes/no questions? Second, how is this structure derived? The study relies on primary data from a questionnaire survey and observation of the language in use, as well as secondary data from a textual corpus. The corpus shows Ẹ̀dó forms polar questions in two ways: the use of prosody and five question markers. This paper confirms the position of previous studies; these markers have distinct distributions. Notwithstanding, it posits Ẹ̀dó polar questions have the same structure. This submission is born out of the proposal of a split complementiser system for the language. The paper bases its argument on the lexicon, similarities between movement operations in polar questions and other syntactic processes, and the simultaneous occurrence of question markers and other types of complementisers. Analyses show question markers project a functional phrase in the proposed system; one may stack the phrase to accommodate constructions with two or more question markers. On the question of derivation, the study explains using the concept of phases from the minimalist program. This paper suggests delaying the spell-out of lower phases is more useful for checking and deleting features of the question markers.