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Abstract
This paper explores the concept of multiple grammars (MGs) and their implications for linguistic theory, language acquisition, and bilingual language knowledge. Drawing on evidence from phenomena such as scope interactions, verb raising, and agreement patterns, I argue that seemingly identical surface structures can be undergirded by different grammatical analyses that may compete within speaker populations. I then propose a typology of MG distributions, including shared MGs, competing MGs, and partial MGs, each with distinct consequences for acquisition and use. Contrary to expectations of simplification, bilingualism can sometimes lead to an expansion of grammatical analyses and does not always lead to the elimination of MGs. The paper discusses methods for predicting environments conducive to MGs, considering factors such as structural ambiguity and silent elements. The examination of MGs compels us to explore how learners navigate underdetermined input, especially in bilingual contexts, and to examine the interplay between gradient acceptability judgments and categorical grammatical distinctions. The study of MGs offers valuable insights into language variation, change, and the nature of linguistic competence.
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