Introduction: one domain of morphology is inflection that adds syntactic considerations to the words. This domain is affected in individual with language disorders. So evaluation of inflection in these people is important. In this study, methods of verb tense inflection evaluation were compared and the best method was determined.

Methods: This study was descriptive-analytical. The participants included 27 girls and 28 boys who were in age group 3 and 4 years old. They were selected by multistage sampling method of Rasht kindergartens. 8 tasks were used for evaluating of verb tense inflection, include: Two optional task, Question task, Sentence completion 1, Sentence completion 2, Immediate repetition, Modelling 1, Modeling 2, Story completion. The tenses that were evaluated included: past simple, present perfect, past continuous, past perfect, simple present, present subjunctive. The results of study were analyzed using central tendency include the mean, measures of variability include the standard deviation (or variance), the minimum and maximum values of the variables and repeated measures with the use of SPSS 16.

Results: The mean scores of immediate repetition was more than others but because of inefficiency was abandoned. Thus story completion was chosen as the best method. Also the results of repeated measures showed that the scores of other methods had significant difference with story completion. Modeling 1 and modeling 2 had the least scores.

Conclusion: The story completion is the best method among other methods of this study.