This commentary discusses Westergaard's (2021) keynote article, which presents a comprehensive model of first language (L1), second language (L2), and third language (L3) acquisition. The commentary presents evidence from a previous study of L3 learners that provides support for Westergaard's property-by-property transfer proposal. The commentary…

This article offers the author's commentary on the Multiple Grammars (MG) language acquisition theory proposed by Luiz Amaral and Tom Roeper in the present issue. Multiple Grammars advances the claim that optionality is a constitutive characteristic of any one grammar, with interlanguage grammars being perhaps the clearest examples of a…

The central claim in Amaral and Roeper's (this issue; henceforth A&R) keynote article is that everyone is multilingual, whether they speak one or more languages. In a nutshell, the idea is that each speaker has multiple grammars or "sub-sets of rules (or sub-grammars) that co-exist". Thus, rather than positing complex rules to…

While agreeing with Lardiere that the "parameter-resetting" approach to understanding second language acquisition (SLA) needs rethinking, it is suggested that a more construction-based perspective runs the risk of losing deductive and explanatory power. An alternative is to investigate the constraints on feature assembly/re-assembly in second…

Discusses syntactic optionality, the coexistence within an individual grammar of two or more variants of a given construction that make use of the same lexical resources and express the same meaning. Focus is on syntactic optionality in second language grammars. (Author/VWL)

Argues that the late acquisition of the third-person singular agreement affix /-s/ in second-language learners of English is the result of a syntactic configuration that makes the ending appear ungrammatical to the learner of English while allowing agreement inflection to appear when the target language has a more robust agreement model, as in the…

Argues that a Universal Grammar (UG)-based analysis for the three stages of NEG-placement is not only possible, but in fact provides independent support for UG-based analyses of the developmental sequence found in first-language Romance language and second-language German verb placement. (41 references) (GLR)

Critiques Pienemann and Johnston (1987), an influential model of the acquisition of English as a second language (ESL) morphology. The article demonstrates that their proposals are incompatible with syntactic analyses of word formation and emphasizes that second language researchers must ensure that models of second language acquisition are…

Replies to Mellow's (1996) criticism of the authors' second language acquisition model. The article argues that this model is based on the psychological concept of exchange of linguistic information and that Mellow's evaluation of various types of transformational analysis is irrelevant. The article also addresses several points of detail in…

Defends the full transfer/full access (FT/FA) model, which hypothesizes that the initial state of second-language (L2) acquisition is the final state of L1 acquisition (full transfer) and failure to assign a representation to input data will force subsequent restructuring. The article considers two other competing hypotheses as well as several…