Grammar reference books
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Teaching tenses
by Rosemary Aitken
An ideal resource for understanding meaning of the verb tenses. It even includes things like timelines and concept check questions, plus common student errors.
Understanding and using English grammar
by Betty Azar and Stacy Hagen
A great resource for meaning and form. It also includes useful practice exercises for students.
Grammar for English language teachers
by Martin Parrott
A very comprehensive resource covering everything from the basics (nouns and adjectives) to the complex aspects of English grammar.