ABSTRACT Fahmi Yahya, 2018, The Roles of BAGANSA on Santri's Second Language Acquisition at TMI. Nurul Huda on Creative Construction's Theory of Dulay and Burt, Thesis, English Teaching Learning Program (TBI), Tarbiyah Faculty, The State of Islamic Institute (IAIN) Madura, Advisor: Hj. Kristanti Ayuanita, M. Pd. Keywords: BAGANSA, Roles, Creative Construction's Theory Modern Islamic boarding…