... tree when it began to rain.Present and Past, Simple and Progressive 27 UNDERSTANDING AND USING ENGLISH GRAMMAR Third Edition AcknowledgmentsThe second edition of UUEG was thoroughly reviewed ... Schrampfer Understanding andusingEnglishgrammar / Betty Schrampfer Azar- - 3rd ed.p. cm.Includes index.ISBNO-13-958661-X1. English language—Textbooks for foreign speakers. 2. English language Grammar Problems, ... that heralds this third edition. I wish to express special acknowledgment of the contributing writers for the Understanding andUsingEnglishGrammar Workbook, Second Edition: Rachel Spack Koch,Susan...