the examples in (10) show that pro is grammatical as the subject of non-finite clauses. in both (10a) and (10b), pro is the subject of the non-finite clause to study physics. in (10a), the antecedent of pro is the matrix subject kerry, and in (10b) it is the matrix object sarah. the examples in (11) show that pro is ungrammatical in finite clauses and in non-subject position: (11a) establishes that pro cannot be the subject of a finite clause, and (11b-c) establish that pro cannot occur in complement position. in particular, (11b) shows that pro cannot be complement to v, while (11c) shows that pro cannot be complement to p.