On the position of ReasonP

The position of the reason-asking ‘why’ has been under much discussion for the past few years. Although some have suggested that it is situated within the CP domain, its exact position varies depending on different proposals. Meanwhile, a noncanonical why-like ‘what’ has also attracted much attention. Some assume it to be merged to the top of a sentence while some assume it to be merged lower. In this study, new evidence is provided to show that in Chinese the reason-asking ‘why’ should be merged to the Int(errogative)P in the CP zone, confirming Rizzi’s (2001) and Tsai’s (2008) claims, whereas the why-like ‘what’ should be merged as low as in vP but target the topmost of a clause, supposedly ForceP, by covert movement.