This volume presents recent theoretical research on Romance languages, selected from papers presented at the 25th Linguistic Symposium on Romance Languages. It includes studies of individual Romance languages as well as comparative studies - both within the Romance family and with non-Romance languages (Basque, Bulgarian, Germanic and Quechua). Papers in phonetics and phonology treat stress, syllable structure, s-weakening, and the declination effect. Morphological topics include class-marker suppression and gender agreement and suppletion. Topics in syntactic theory include clitics, participial and adjectival agreement, the syntax of tense, mood, negation, adjectival predication, Tough-constructions, quantification and null objects.