This chapter addresses the relationship between syntax and morphology, asking whether they are independent or related in any way. Particularly strong confirmation of the parallelism between morphology and syntax comes from Cinque's work, in particular his 1999 book Adverbs and Functional Heads . Cinque argues that both the adverb order and the affix order reflect the same underlying hierarchical structure, with the linear order of the adverbs reflecting it directly and the linear order of the affixes resulting from local syntactic movement, precisely as predicted by the Mirror Principle. The Mirror Principle predicts that, of four conceivable morphosyntactic relationships between agreement and GF-rules, the languages of the world will attest only two.
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