'Understanding and Using English Grammar' by Betty Schrampfer Azar is a highly acclaimed textbook designed for intermediate to advanced English language learners. It offers clear, concise explanations of grammatical structures, coupled with abundant practice exercises that reinforce understanding and promote practical application. The book's systematic approach, featuring contextualized examples and diverse activities, makes complex grammar accessible and engaging. It is an indispensable resource for students seeking to master English grammar for academic or professional purposes, fostering confidence in both written and spoken communication.