On the difference between exhaustive and partial control

This chapter compares the partial/exhaustive control distinction in Russian, Icelandic and European Portuguese and argues that all three share a common core: genuine partial control readings are only possible where PRO has case. An analysis of these patterns is outlined whereby partial control involves agreement between a higher thematic head and pro in the edge of a lower CP phase. Although this thematic head Agrees with pro, it is unable to attract it to absorb its θ‎-role. As a result, a distinct controller is merged with said thematic head and a condition is imposed at the interface that the controller and pro must be non-distinct, yielding partial control. New evidence is presented for this analysis based on negative controllers and the interaction with wh-movement.