Abstract
It is important to decide what items in grammar should be taught at first when we teach a language especially to beginners. This research deals with the critical issue by using the data that are got by checking the students' usage of grammatical morphemes in essay writing from both correct usage and usage of errors. The examinees are the three grades of Kisarazu National College of Technology (KNCT is used as abbreviation form in this thesis), and 1st year students of Keiai Junior College students for two years. At the end of the thesis the author of this thesis proposes some issues to promote the researches in the field of Second Language Acquisition, especially in the Sequence of Acquisition items.
