This text is a carefully programmed lesson that focuses strictly on the use of postpostions (ga and (w)o) in Japanese grammar; an area that is often confusing and a difficult stumbling block for students of Japanese language.A unique attribute of the lesson is a formula for explaining the relationship between Japanese verb structure and postpositions. A theory that Wood developed more than 20 years ago and has refined. It is an interesting and revolutionary way of looking at sentence structure and how, by evaluating the verb structure, one can determine the proper postposition for use with a direct object in a Japanese sentence.