Over a century ago, rhetoricians called on writing instructors in the U.S. to accept and even encourage language diversity among learners. Yet scholars of composition, rhetoric, and writing studies are still advocating for this via arguments for linguistic justice and translingualism, even referring to strict adherence to a single, mainstream…

Children who speak non-standardized language varieties are at risk for both over- and under-referral to speech-language and special education services (e.g., Morgan et al., 2016; Pearson et al., 2014). Extensive research with bidialectal (Craig, 2016; Kohn et al., 2021) and bilingual (Goldstein, 2022; Paradis et al., 2021) children has shown the…

Acquisition of the perfective marker "-le" in Mandarin Chinese is a daunting task for second language learners. To date, there has been no consensus on what it is about "-le" that makes it such a challenge to learners. This study investigates the acquisition of "-le" from both a lexical perspective and a discourse…

Speakers display considerable variability in language use and representations: they may have different pronunciations of the same word, different intended meanings for the same phrases, and different sets of syntactic constraints in their internalized grammars. Comprehenders adapt to such variability by constantly updating their expectations for…

Language sample analysis (LSA) represents a venerated and ecologically valid method for diagnosing, identifying goals, and measuring progress in children with developmental language disorder (DLD). With many LSA measures available, previous research offers limited guidance on which measures should be prioritized based on their robust reliability,…

This study investigates the acquisition and maintenance of periphrastic and se-passives in second language (L2), heritage (HS), and (Spanish-dominant) native Spanish speakers (NS) by addressing: (i) How accessible are Spanish periphrastic passives (which also exist in English) and se-passives (unique to Spanish) for L2ers and HSs in production?…

Due to the typological differences between Korean's aspect system and English's aspect system in terms of progressive construction "-ko iss," learners can no doubt have difficulty acquiring and using the "-ko iss" construction in learner Korean. This dissertation investigates two main points: (i) how is the "-ko iss"…

This dissertation investigates when and how children figure out the force of modals, that is, when and how they learn that "can/might" express possibility, whereas must/have to express necessity. Learning modal force raises a logical "Subset Problem": given that necessity entails possibility, what prevents learners from…

Bilinguals are able to compose expressions across their languages with seeming ease. This phenomenon, commonly referred to as "code-switching," has challenged both theoretical models in linguistics as well as neurobiological models of language processing. And yet, our models of the bilingual brain and the language processing mechanism…

This dissertation investigates the language ideologies and language practices that language users encounter and engage with in an Intensive English Program (IEP) class. The purpose of examining language ideologies (these include ideologies about language, language use, language learning, language practices, and language teaching) and language…

This mixed methods study draws upon theoretical perspectives from usage-based linguistics (UBL) and variationist sociolinguistics to explore four learners' use of second language (L2) Spanish present tense indicative verbal inflectional morphology (i.e., simple present conjugations). The study compares the frequency and distribution of students'…

It is standardly believed that some occurrences of expressions designate singularly, while other occurrences of expressions designate plurally. For instance, the singular expression the student may be used on an occasion to talk about one particular student, while the plural expression the students may be used on an occasion to talk about several…

This study examines associations between writing instruction with a focus on explicit sentence syntax and reading comprehension in a sample of students receiving special education services. While the outcome data does not show direct causation between student enrollment in a treatment writing course using Systemic Functional Linguistics and…

Recent research in the areas of second language testing and learner corpus research has provided increased insight into linguistic features of various score levels and into the meaning of a test score (Cushing, 2017; Knoch & Chapelle, 2018). However, language testing researchers have asserted the need to select linguistic features that are…

The main purpose of this dissertation is to examine the (in)effectiveness of the Usage-based grammar approach through explicit instruction of adverbials in the US educational context. One area that can complicate the question of native speakers' grammar knowledge is their awareness of grammatical terms and their functions. Along with exploring…