This book is a concise and accessible introduction to the ways in which relations between words in sentences are marked in languages. The author describes the systems of suffixes familiar from languages like Latin and also the roles of prepositions, postpositions and the use of the pronominal elements on verbs. This new edition incorporates expanded discussions of the key concepts, taking into consideration current developments in the field, and includes an updated section on abstract case in the Chomskyian paradigm.