My research explores the nature of the human language faculty. It has two main strands. One concerns theoretical syntax, and in particular the question of how the human language faculty encodes grammatical dependencies (relations between words or groups of words, such as 'subject of', 'object of', and so on). The other strand concerns the interaction between syntax and the systems with which the syntax interfaces (phonology and semantics). Issues I have worked on in this area include the status of word formation, the effects of stress assignment on word order and on interpretation, and semantic restrictions on the stacking of degree expressions.