“…Regarding nonobservable linguistic properties, several generative L2 acquisition studies have provided evidence of acquisition of such properties—particularly in very advanced learners—through research into L2 poverty-of-the-stimulus phenomena (Dekydtspotter & Hathorn, 2005; Kanno, 1998; Marsden, 2008, 2009; among others). Much generative L2 acquisition research has also investigated phenomena that—to at least some extent—are regularly taught in the classroom and are also observable in incidental input, including gender morphology (Hawkins & Franceschina, 2004; Montrul, Foote, & Perpiñan, 2008; White, Valenzuela, Kozlowska-Macgregor, & Leung, 2004), object clitics in Spanish and Italian (Bennati, 2007; Santoro, 2007; Slabakova & Rothman, 2012; among others), and articles in L2 English (Ionin, Zubizarreta, & Maldonado, 2008; Snape & Kupisch, 2010; among others). However, most generative L2 acquisition research sets aside the question of how classroom instruction influences the development of L2 knowledge.…”