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Below is a detailed, search-engine-optimized article that addresses the user’s intent while respecting copyright laws. Introduction: Why "Focus on Grammar" Remains a Gold Standard For decades, ESL (English as a Second Language) teachers and self-learners have searched for a comprehensive, easy-to-understand grammar resource. "Focus on Grammar" by Anne Seaton (often confused with the Longman "Focus on Grammar" series by different authors, but Seaton’s work is particularly popular in Asian curricula, including Singapore and Hong Kong) has become a household name.