“…Learners attempt to use the perfective with atelics, as in 4.1 and 4.2, and imperfective with telics, as in 4.3 and 4.4. The last recurring finding is that the use of the non-prototypical past constitutes a major L2 challenge, even for highly proficient L2 learners after extensive exposure to French in Canadian immersion programs (Harley, 1992;Harley & Swain, 1978); advanced learners in university contexts (Bardovi-Harlig & Bergströ m, 1996); university learners living in French-speaking countries (Howard, 2001); and learners who mark the perfective/imperfective distinction in their L1 (i.e., Spanish; Izquierdo, 2009;Izquierdo & Collins, 2008 Due to this shared developmental challenge, Blyth (2005) and Howard (2002) advocate systematic instruction on non-prototypical past.…”