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Annisa Utami, Syahrul and Lailatul, Husna and Welya, Roza (2017) AN ANALYSIS OF THE SECOND YEAR STUDENTS` GRAMMATICAL ERRORS IN TRANSFORMING AFFIRMATIVE INTO NEGATIVE AND INTERROGATIVE SENTENCES OF SIMPLE PAST TENSE AT SMP BUNDA PADANG. Diploma thesis, Universitas Bung Hatta.