Sinaga, B., Lumban Raja, V. and Ginting, F.Y.A. 2020. ERROR ANALYSIS ON THE USING BE OF SIMPLE PRESENT AND SIMPLE PAST TENSES AMONG THE SEVENTH GRADE STUDENTS OF SMP NEGERI 2 NAINGGOLAN. Kairos English Language Teaching Journal. 3, 3 (Jul. 2020), 208–223. DOI:https://doi.org/10.54367/kairos.v3i3.841.