What makes a good middle? The role of qualia in the interpretation and acceptability of middle expressions in English

Middle expressions ( The car drives smoothly, The book doesn't sell, These chairs fold up ) have long fascinated students of the English language. This article examines some of the factors which contribute to the acceptability of such expressions. Rejecting a lexicalist approach, which aims to identify a class of middle-forming verbs, we propose, instead, a global characterization of the construction, with specific focus on properties of the subject referent in association with the semantics of the predicate. The middle construction, we argue, presents a non-Agent participant as primarily responsible for the potential actualization of the process designated by the verb phrase. The subject referent, therefore, has to be able to be construed as possessing properties which significantly facilitate, enable (or, as the case may be, impede) the unfolding of the process in question, while, at the same time, the contribution of the Agent to the process is backgrounded. We explore this thesis with specific reference to the qualia structure of the subject nominal.