Abstract
In this study, we report the result of a questionnaire survey of advanced students who are in our graduate school on the shitsutsuaru form acquisition. It was found that they made more errors of that form than the sbiteiru form and couldn't understand the criteria of choice between these two forms in the expression of progressive action. The significant correlation between the errors of the shitsutsuaru form and the length of their stay in Japan wasn't found in an examination with the F-test. From all of these pieces of evidence, we need to establish how to teach the shitsutsuaru form effectively in Japanese language classrooms.
