This material was designed to present the essential features of English phrase and clause structure, for the benefit of both native speakers and learners of English as a second language. The author has followed a "deliberately eclectic" approach. The diagrams are developments of the type discussed and exemplified in Hockett, 1958, and Hall, 1964, combining a "quasi-tagmemic" approach (identifying the positions of "slots" in which forms of various classes may be used) with a graphic presentation of the possibilities open to a speaker once he has chosen a given syntactic path. Where useful, transformational formulations have been adopted (in as simple a form as possible), especially in stating relationships among clause types. The "Commentary on Phrase-Structure Diagrams" chapter treats noun, pronominal, numeral, adjectival and adverbial, verbal, prepositional, conjunctional, and headless or exocentric, phrases. The second half of the main work, "Commentary on Clause-Structure Diagrams," treats declarative and imperative clauses, subordination, and minor clauses. Teaching suggestions, bibliographical references, and illustrative diagrams complete the volume. (AMM)