ASTUTI, AYU PUJI. 2010 : An Analysis on The Students' Errors in Using English Auxiliary Verbs Made by The 8th Grade Students of SMP An-Nuriyyah Bumiayu Brebes in Academic Year 2009/2010. Thesis, Srata I Program. Faculty of Education and Teacher Training Pancasakti University Tegal. Key word: Error analysis, English Auxiliary Verbs. This thesis is a research about analysis on the students'…