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Abstract: We review and discuss some issues to do with the relation between morphology and syntax which have played a prominent part in generative linguistic research in the past three decades. Focusing on verbal inflection, we first discuss the relation between inflection and verb placement, with special attention given to verb-initial languages. We then discuss the relation between pro-drop and agreement, where we articulate a partly new understanding of Huang''s (1989) generalization that pro-drop is characteristic of languages with rich agreement and languages with no agreement, but not languages that are in-between. We then present and discuss the Mirror Principle, one of the most significant findings in recent linguistic research. We pay special attention to the Mirror Principle as it applies in head-final languages, in the context of a model adopting Kayne''s (1994) Linear Correspondence Axiom. The idea is to show how fairly complex aspects of clausal syntax, including word order and the possibility of phonetically silent arguments of a predicate, may be correlated with readily observable and, in themselves, rather simple properties of verbal inflection, and to show how, given a restrictive theory of Universal Grammar, this follows from the fact that inflections are syntactic categories, albeit realized as parts of words. [Copyright &y& Elsevier]

Abstract: This study investigates the child (L1) acquisition of properties at the interfaces of morpho-syntax, syntax-semantics and syntax-pragmatics, by focusing on inflected infinitives in European Portuguese (EP). Three child groups were tested, 6–7-year-olds, 9–10-year-olds and 11–12-year-olds, as well as an adult control group. The data demonstrate that children as young as 6 have knowledge of the morpho-syntactic properties of inflected infinitives, although they seem at first glance to show partially insufficient knowledge of their syntax–semantic interface properties (i.e. non-obligatory control properties), differently from children aged 9 and older, who show clearer evidence of knowledge of both types of properties. However, in general, both morpho-syntactic and syntax–semantics interface properties are also accessible to 6–7-year-old children, although these children give preference to a range of interpretations partially different from the adults; in certain cases, they may not appeal to certain pragmatic inferences that permit additional interpretations to adults and older children. Crucially, our data demonstrate that EP children master the two types of properties of inflected infinitives years before Brazilian Portuguese children do (), reasons for and implications of which we discuss in detail. [Copyright &y& Elsevier]