In this article, we examine evidence for the phase theory of movement (Chomsky 2000, 2001) in the context of Tagalog, arguing in particular that Tagalog has overt morphology that signals movement of arguments to checkan EPP-feature on the head of the vP phase. We show that this morphology interacts with extraction in ways Chomsky's theory leads us to expect, and we develop a theory of the Tagalog facts that also accounts for the effects of Huang's (1982) Condition on Extraction Domain.