“…Different discourses, from academic discourse to legal discourse, as well as different genres of texts have been the main sources for investigations of frequency, structural and functional features of lexical bundles. Different genres of spoken and written academic discourse have been investigated by , Cortes (2004), Biber et al (2004), Simpson (2004), Biber (2006), Hyland (2008b), Simpson-Vlach and Ellis (2010), Salazar (2010), Jalali and Moini (2014), Pan et al (2016), andYang (2017). Besides different studies focusing on the use of lexical bundles across different disciplines, many of the previous works on lexical bundles in academic discourse have focused on differences and similarities of the use of lexical bundles between L1 and L2 writers (Salazar 1996;De Cock 1998;Schmitt 2005;Salazar 2011;Juknevičienė 2011;Ädel & Erman 2012;Amirian et al 2013;Purificación 2013;Pan et al 2016;Güngör & Uysal 2016;Güngör 2016) as well as between novice and expert writers (Cortes 2004;Chen & Baker 2010).…”