This supplementary offering for English-as-a-second-language courses was prepared to help isolate and treat most of the "goofs" that students regularly make in speaking and writing English. Each error is presented in its grammatical context, and chapters are arranged on the basis of groups of errors that fall together structurally. Included are "The Skeleton of English Clauses,""The Auxiliary System,""Passive Sentences,""Temporal Conjunctions,""Sentential Complements," and "Psychological Predicates." Each chapter contains an "Analysis of Goof Types" and "Pedagogical Notes." There is a lengthy introduction with teaching suggestions and an explanation of the "gooficon" rationale. Particular emphasis is placed on the question of "hierarchy:" correction of the most important error--the one that interferes with comprehension and communication--rather than, or at least before, any others. (HW)