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Utariningsih, Wheny and , Prof. Dr. Endang Fauziati, M. Hum and , Muamaroh, Ph.D (2014) Interlanguage system to represent present and past event by students of smp muhammadiyah 6 surakarta academic year 2013/2014. Skripsi thesis, Universitas Muhammadiyah Surakarta.