Preface -- Acknowledgments -- Table of contents -- Grammatical interfaces in Romance languages: An introduction -- I. Sound and structure -- 1. Surface sound and underlying structure: The phonetics-phonology interface -- 2. Segmental phenomena and their interactions: Evidence for prosodic organization and the architecture of grammar -- 3. Prosodic phonology and its interfaces -- 4. Phonology and morphology in Optimality Theory -- 5. Inflectional verb morphology -- II. Structure and meaning -- 6. Meaning of words and meaning of sentences -- 7. Morphology and semantics: Aspect and modality -- 8. (In)definiteness, specificity, and differential object marking -- 9. Agreement restrictions and agreement oddities -- 10. Auxiliary selection -- III. Sound, structure, and meaning -- 11. Subjects, null subjects, and expletives -- 12. Object clitics -- 13. Nominalizations -- 14. Information structure, prosody, and word order -- 15 VP and TP ellipsis: Sentential polarity and information structure -- 16. Existential constructions -- IV. The role of the interfaces in language acquisition and change -- 17. Acquiring multilingual phonologies (2L1, L2 and L3): Are the difficulties in the interfaces? -- 18. Interfaces with syntax in language acquisition -- 19. The role of the interfaces in syntactic change -- 20. Interfacing interfaces: Quechua and Spanish in the Andes -- 21. Grammaticalization and pragmaticalization -- 22. Changes at the syntax-discourse interface -- Index.