Mother tongue interference in speaking Arabic of Darul Lugah Waddirasatil Islamiyah Boarding School Santriwati

Darul Lughah Waddirasatil Islamiyah is obligated to use the Arabic language, but santriwati always make mistakes by interfering with the Madurese language, their mother tounge. The researcher, therefore, will analyze and describe interference, the element of interference, and the solution of mistakes. The method of research is descriptive analysis with a qualitative approach. The instruments of research are interviews, observation, and documentation. Then, the data are analyzed with Milles and Huberman’s theory. The research results show that the form of interference of mother tongue at Boarding School Darul Lugah Waddirasatil Islamiyah is the interference of phonology, morphology, syntax, and semantic interference and interference lexical. Interference problems are the weakness of the supervisor, lack of mufrodat and qowaid, and forced speaking the Arabic language without a supervisor. The interference solutions are observation, mufrodat and qowaid, and listening to a native speaker speaking Arabic