By exploring ways of designing computer-based instruction without having to learn a computer language and by learning ways of thinking that are compatible with the microcomputer, English teachers can take control of the computer in the classroom. Authoring languages are currently available that allow the teacher to input original subject material in personally styled language. Since computers also constrain thinking in very systematic ways, "Structured English," a limited set of complex, imperative sentences in which adverbial clauses set conditions or times for commands to be performed, has been developed for use with flow chart figures to create teaching programs. By following rhetorical guidelines developed through experience with "Structured English," teachers can create computer programs that actually engage or lead the learner with the intuitive insight of a live teacher. Sentences should be free of jargon and brief; commands should be invitational and supportive; choices should make a real difference; and the tone of all verb phrases should be friendly. Even with "Structured English," modified flow charts, and authoring systems, an English teacher still must be able to imagine what will be displayed on the video monitor each step of the sequence. A "script guide," a loose-leaf notebook providing precise communication between designer and programer, is an excellent tool for this purpose. (Figures include sample video displays of an authoring system.) (JL)