This book explores the variety of types of complementation found across the languages of the world and their grammatical properties and meanings. It shows how languages differ in the grammatical properties of complement clauses and in the types of verbs which take them, and explores the complement strategies deployed by languages which lack a complement clause construction. The book includes detailed studies of particular languages, including Akkadian, Israeli, Jarawara, and Pennsylvania German. These are framed by R. M. W. Dixon's introduction, which sets out the range of issues, and his conclusion, which draws together the evidence and the arguments.