Three elementary demonstration-classes at San Fernando Valley State College were taught to perform a variety of sentence-building exercises demanding work with kernel sentences and their transforms. The primary class--a disadvantaged group--learned to manipulate questions, adjectives, and coordinating transformations. The third-fourth grade class--an average group--produced possessives, attributive adjectives, relative clauses, and questions. The fifth-sixth grade class-- a superior group--experimented with passives, "there" transformations, compound coordinates, and double-base transformations. At the end of the 6-week term, teachers aggreed that, at all elementary grade levels, children readily acquire the capacity to make transformations and that their writing profits by the exercise. (A related bibliography and examples of sentence-building exercises based on transformational grammar are included.) (JB)