Understanding and Using English Grammar, Fourth Edition, components include:

Student Book, now with Audio CDs. Available in full and split editions.

Full Edition: ISBN 0-13-233333-3; 978-0-13-233333-7  
Full Edition with Answer Key: ISBN 0-13-233331-7; 978-0-13-233331-3
Volume A (Chapter 1-11): ISBN 0-13-233330-9; 978-0-13-233330-6 
Volume B (Chapters 12-20): ISBN 0-13-233332-5; 978-0-13-233332-0

Chartbook: a compilation of all the grammar charts from the Student Book, for easy reference.

ISBN 0-13-958703-9; 978-0-13-958703-0

Workbook: consisting of self-study exercises for independent work.

Full Edition: ISBN 0-13-241543-7; 978-0-13-241543-9
Volume A (Chapters 1-11): ISBN 0-13-241544-5; 978-0-13-241544-6
Volume B (Chapters 12-20): ISBN 0-13-241545-3; 978-0-13-241545-3

Teacher's Guide with PowerPoint CD-ROM, with teaching suggestions, grammar notes, expansion activities, and answer key.

ISBN 0-13-205211-3; 978-0-13-205211-5

Test Bank, consisting of quizzes, tests, and mid-term and final exams

ISBN 0-13-205214-8; 978-0-13-205214-6

Chartbook, a reference text consisting of  only the grammar charts

ISBN 0-13-205214-8; 978-0-13-205214-6

Student Book Answer Key 

ISBN 0-13-241546-1; 978-0-13-241546-0

Some components of Understanding and Using English Grammar, Third Edition, are also available:

Student Book: available in full and split editions.

ISBN 0-13-958661-X; 978-0-13-958661-3 (full)
ISBN 0-13-958729-2; 978-0-13-958729-0 (Vol. A; Chapters 1-11)
ISBN 0-13-958752-7; 978-0-13-958752-8 (Vol. B; Chapters 12-20)

Student Book with Answer Key (full)

ISBN 0-13-097605-9; 978-0-13-097605-5

Chartbook: a compilation of all the grammar charts from the Student Book, for easy reference.

ISBN 0-13-958703-9; 978-0-13-958703-0

Workbook: available in full and split editions; offers self-study practice (with answers provided) for independent study or classroom use.

ISBN 0-13-958687-3; 978-0-13-958687-3 (full)
ISBN 0-13-958737-3; 978-0-13-958737-5 (Vol. A; Chapters 1-11)
ISBN 0-13-958760-8; 978-0-13-958760-3 (Vol. B; Chapters 12-20)

Teacher's Guide

ISBN 0-13-958679-2; 978-0-13-958679-8 (full)

Answer Key 

ISBN 0-13-020552-4; 978-0-13-020552-0

Test Bank

ISBN 0-13-958695-4; 978-0-13-958695-8

TestGen® CD-ROM

ISBN 0-13-192669-1; 978-0-13-192669-1