In this study the syntactic properties of empty categories and dummy pronouns are investigated within the framework of Government-Binding theory. The assumption that clauses must have a subject is present in most, if not all, linguistic theories. In GB theory the requirement that clauses have a subject is stipulated as a consequence of the base rules or the Extended Projection Principle. In this book it is claimed that no such stipulation is necessary. The presence of a subject is exclusively determined by the theories of thematic roles and Case.This view is supported by the fact that the...