Guglielmo Cinque 
Adverbs and Functional Heads [PDF ebook] 
A Cross-Linguistic Perspective

One of the world’s leading syntacticians presents evidence for locating Adverb Phrases in the specifiers of distinct functional projections within a novel and well articulated theory of the clause. In this theory, both adverbs and heads, which encode the functional notions of the clause, are ordered in a rigid sequence. Cinques cutting-edge proposal suggests that the structure of natural language sentences is much richer than previously assumed.