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If you buy the new edition from Cambridge, you often get access to the English Grammar in Use supplementary app. It provides 200+ additional interactive exercises that track your weak points and adapt questions accordingly. raymond murphy english grammar in use intermediatepdf new
Is the 3rd or 4th edition good enough? Grammar rules don't change. The core content (conditionals, tenses, prepositions) is 95% identical across editions. The 4th edition (2012) PDF is widely available for free on educational archive sites like Archive.org, though legality varies by country. The search for is understandable