Immel Constance, Sacks Florence. Better Grammar in 30 Minutes a Day

Weiser, 1999. — 163 p. — (Better English). — ISBN10: 1564142043, 13 978-1564142047.This easy-to-use guide to grammar not only teaches you to use the right verb at the right time, but helps you brush up on all your rusty grammar skills so you can write and speak clear, error-free English with confidence.
You'll also find:
Thorough coverage of key areas of grammar.
Easy-to-understand explanations and plenty of exercises to test and refine your skills.
An answer key at the back of the book to encourage you to work at your own pace and check your answers as you go.
A glossary for a quick review of any grammatical term discussed in the book.