“…Indeed, previous research has shown that extensive reading could improve learners' reading (Bell, 2001;Iwahori, 2008;Mason & Krashen, 1997), grammar (Lee et al, 2015;Sheu, 2003;Yang, 2001), and vocabulary (Horst, 2005;Pigada & Schmitt, 2006;Senoo & Yonemoto, 2014;Vu & Peters, 2020, 2021a, 2022. Therefore, online extensive reading could have the same effects on L2 learners' English competence as previously shown for extensive reading.…”