"This book provides an in-depth discussion of the expression of negation in Welsh, especially in colloquial or informal Welsh. The book draws on modern grammatical theory to provide detailed and precise descriptions of one of the richest and most complex areas of Welsh grammar. It also develops formal analyses and explores the implications of the Welsh facts for grammatical theory. It should be of interest both to readers with an interest in Welsh but with little knowledge of grammatical theory and to specialists in grammatical theory with little or no knowledge of Welsh."--Jacket.