In Chapter 5, the competing grammars model of morphosyntactic variation is introduced from both a sociolinguistic and computational perspective. The example of nominative substitution in Faroese is used to demonstrate the advantages of the model, in particular the combination of classic Optimality Theory constraints with a probabilistic activation hypothesis. The Faroese dative-subject verbs discussed in Chapters 2 and 4 occur in both dative–accusative and nominative–accusative case frames. The competing grammars model is outlined as a cogent explanation of the co-existence of both forms in use by a given speaker, sometimes within the same text or short series of utterances. Relevant factors proposed to influence selection of the nominative versus dative variants are discussed, including both grammatical and social/contextual variables. The importance of social meaning in determining case selection is highlighted, which presents a Rational Speech Act model of this morphosyntactic variable. In a section co-authored with Rob Mina, the issue of bimodally distributed judgement data is explored, in particular whether such data are effectively random or represent distinguishable dialects, and how to tell. Finally, neural approaches are discussed as an alternative model of competing grammars.

The Cambridge Handbook of Childhood Multilingualism provides a state-of-the art view of the intra- and interdisciplinarity in linguistics, psychology, sociology, and education through a kaleidoscope of languages, countries, scholars, and cultures. The volume provides: (1) understanding that for most children multilingualism is the linguistic reality in which they grow; (2) an analysis of the effect of languages flowing from different sources, at different times and in different forms, on the uniqueness of child multilingualism processing beyond mono/bilingualism; (3) insights into diversity in the socialization of multilingual children; (4) elaboration of the triangulation of childhood, parenthood, and schooling as natural multilingualism-cultivating conditions motivated by internal and external forces; (5) an integrative approach to multilingual children’s development where the child at the center is cradled by multilingualism and languages, and (6) a focus on multilingualism as a capacity independent from mono/bilingualism. The different language typologies, in different countries and different continents, gathered in this volume tease out what is universal to childhood multilingualism as an agent of “new linguistic realities.”

This chapter provides an overview of scholarship on Chinese sentence-final particles (SFPs) from sociolinguistic and discourse perspectives. The chapter begins with a brief introduction to the typological and areal features associated with SFPs, followed by discussions of studies of this linguistic category in data-based empirical research as well as in descriptive grammars. The goal of the overview is to identify the main strands of theoretical underpinnings as well as to outline the major methodological approaches. The chapter concludes with a discussion of future research directions.