STUDENTS’ ERRORS ANALYSIS IN CHANGING ACTIVE VOICE INTO PASSIVE VOICE OF SIMPLE PRESENT AND PAST TENSE (A CASE STUDY AT EIGHTH GRADE OF SMP SWASTA PUTERI SION MEDAN). EJI [Internet]. 2020 Jan. 16 [cited 2025 Oct. 13];4(1):134-4. Available from: https://ejournal-fkip.unisi.ac.id/eji/article/view/859