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RAFI’ATUN , SITI (2007) AN ANALYSIS OF GRAMMATICAL ERROR IN CONSTRUCTING SENTENCES IN SIMPLE PRESENT TENSE AND SIMPLE PAST TENSE MADE BY THE LEARNERS AT GAMA INTEGRA PEDAN KLATEN IN 2006 / 2007 ACADEMIC YEAR. Skripsi thesis, Universitas Muhammadiyah Surakarta .