The subject of nonfinite clauses is often missing, and yet is understood to refer to some linguistic or contextual referent (e.g. 'Bill preferred __ to remain silent' is understood as 'Bill preferred that he himself would remain silent'). This dependency is the subject matter of control theory. Extensive linguistic research into control constructions over the past five decades has unearthed a wealth of empirical findings in dozens of languages. Their proper classification and analysis, however, have been a matter of continuing debate within and across different theoretical schools. This...