“…Research on the L2 acquisition of variable structures covers many languages and a range of grammatical properties, extending from phonetic to morphosyntactic to lexico-semantic (see Long, 2014, andDe Vogelaer &Katerbow, 2017, for overviews). For example, while research on English (e.g., Adamson & Regan, 1991;Major, 2004) and French (e.g., Regan, Howard, & Lemée, 2009;Rehner, Mougeon, & Nadasdi, 2003) once dominated, we now see examples of research on variation in Spanish (e.g., Kanwit, 2017), Norwegian (Karlsen, Geva, & Lyster, 2016), Arabic (Raish, 2015), and Mandarin (Li, 2014), to name a few.…”