ABSTRACT
In this chapter, I explore certain syntactic phenomena induced by sentence negation in Basque and English, and I attempt to provide a unified account of them, based on a universal requirement on functional heads. This requirement, which I will refer to as the Tense C-command Condition, is stated in (1). It requires that all functional heads in the clause that are propositional operators be c-commanded' by the head Tense at S-structure.
