(1) Comiste mäs peras de las que parece eat-past-2sg more pears than what seem-pres-3sg ate more pears than it seems'

These sentences are interesting because, although the Spanish verbparecer'seem'always requires a complement to be on its right, this seems not to be the case in (l). 1 In Section l, we will try to give an account for this phenomenon (which we will call Null Complement, henceforth NC) within the Government and Binding framework. 2 We will assume that parecer is a lexical item which has to assign a theta-role to a position on the right. The Projection Principle (Chomsky 1981) forces such a process to take place and to be manifested at the different levels of representation: Deep Structure (DS), Syntactic Structure (SS), and Logical Form (LF). That is to say, if theta-role assignment has to take place to a position present on the right of the verb parecer, this position has to be present at DS, SS, and LF. Furthermore, the Theta-Criterion3 forces such a position to be filled by an argument, that is, by a constituent with referential Status. There are two options for sentences such äs (1):