DESIGN SERVICES OF English Grammar UNDERSTANDING AND USING FOURTH EDITION Betty S. Azar Stacy A. Hagen 102412_Azar_FMWoAnsKey.qxd 1/9/09 2:00 PM Page i. INTERNATIONAL EDITION—Not for Sale in the U.S.A. Third Edition with ANSWER KEY. Grammar 4e SB.pdf Understanding and using English Grammar Student's Book. Essential Grammar in Use Fourth edition is a self-study reference and practice book for. English Grammar in Use - 3rd Edition.pdf.