“…DMs have been investigated in classroom oral discourse (Hays, 1992), informal settings (Lee, 1999;Muller, 2004;Trillo, 2002), reading (Abdullah Zadeh, 2006;Jalilifar & Alipour, 2007), lectures (Dailey-O'Cain, 2000;Perez & Macia, 2002), academic genres (Abdi, 2002;Blagojevic, 2003;Bunton, 1999;Longo, 1994;Mauranen, 1993;Ventola & Mauranen, 1993), and student writings (Connor, 1984;Field & Yip, 1992;Intraprawat & Steffensen, 1995;Johns, 1984;Johnson, 1992;Karasi, 1994;Norment, 1994;Steffensen & Cheng, 1996. These studies have targeted their use patterns of frequency.…”