Natural language understanding is central to the goals of artificial intelligence. Any truly intelligent machine must be capable of carrying on a conversation: dialogue, particularly clarification dialogue, is essential if we are to avoid disasters caused by the misunderstanding of the intelligent interactive systems of the future. This book is an interim report on the grand enterprise of devising a machine that can use natural language as fluently as a human. What has really been achieved since this goal was first formulated in Turing’s famous test? What obstacles still need to be overcome?

A lively, up-to-date and compact introduction to semantics, accessible to those with no prior knowledge of linguistics.

This book explores possible and impossible word meanings, with a specific focus on the meanings of verbs. It presents a new theory of possible root meanings and their interaction with event templates that produces a new typology of possible verbs, with semantic and grammatical properties determined not just by templates, but also by roots.

Accessing Noun-Phrase Antecedents offers a radical shift in the analysis of discourse anaphora, from a purely pragmatic account to a cognitive account, in terms of processing procedures. Mira Ariel defines referring expressions as markers signalling the degree of Accessibility in memory of the antecedent. The notion of Accessibility is explicitly defined, the crucial factors being the Salience of the antecedent, and the Unity between the antecedent and the anaphor. This analysis yields an astonishing array of new results. The precise distribution of referring expressions in actual discourse is directly predicted. Several universals of anaphoric relations are stated. Thus, although not all languages necessarily have the same markers, and nor do they assign them precisely the same function, Ariel shows that they all obey the same Accessibility marking hierarchy. This book will be compulsory reading for anyone with an interest in the semantics and pragmatics of referring expressions, in the interaction of semantics and pragmatics, and more generally in the interaction between peripheral and central cognitive systems.