First published in 1994, this book is concerned with certain kinds of wh-clauses, whose interpretations are easily and, the author argues, plausibly rendered by a logicosemantic analysis on which wh-phrases translate as open sentences, that is, as expressions of the semantically interpreted representation which contain free variables. After a review of influential contemporary analyses of the semantics of questions, concentrating on issues related to the truthconditional interpretation of these constructions, the author goes on to analyse logicosemantic similarities between wh-phrases and indefinite NPs. This analysis is extended in chapter V to account for asymmetries between wh-phrases and indefinites, but is preceded by the engagement and refutation of some of the challenges to it. The appendices discuss some peripheral points relating to the central points made by the author which are in need of further study.