Generative theory has long sought to capture the syntax of Control, questioning whether the complement clause contains a syntactically projected thematic Subject, whether such an argument undergoes displacement and, if so, where and why, and what role semantics may play. This book continues in this tradition, critically examining paradigms erroneously assumed to favor PRO analyses over Movement and implicit argument accounts. It offers novel data amenable to analysis only within a PRO approach - but one radically different from its predecessors in form and interpretation.