An Error Analysis on changing active voice into passive voice

The aims ofthis writing are (1) to know the kinds oferrors on changing active voice into passive voice into passive voice, and (2) to know which tense has the highest frequency of errors. The errors are identified on four categories, namely : omission, addition, misformation and misordering. Based on the type of tenses namely : Type A (the sentences using simple present tense), type A (the sentences using present continous tense). Type C (the sentences using simple past tense), type D (the sentences using future tense. Tlpe B has the highest number oferrors. So, it is better for the English teacher to give more attention in teaching grammar, aspecially passive voice