First Published in 2004. This work consists of three studies in the syntax of natural languages, which pursue related theoretical goals, assume common phrase structural and locality sub-theories and share some of the languages from which the supporting data are drawn. A theme that is central to both the first and third studies and tangentially touched upon in the second study is that of the syntax of the null element pro in various contexts and with various roles, but first and foremost as Head of Free Relative Constructions and as Null Operator. Another theme of central importance, primarily in the first two studies, is that of the syntax of Case.