This document discusses sentence transformations in English grammar. It begins by explaining that sentence transformations allow language to be more complex and varied by moving, adding or deleting words. It then provides examples of the indirect object transformation, where a prepositional phrase following a direct object can be removed and the object it referred to becomes the indirect object. The document also discusses other types of sentence transformations like passive voice, negatives, questions, exclamations and imperatives. It provides rules and structural formulas for performing each of these transformations.