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1 2 CRYSTAL, David. Rediscover Grammar. 3 SWAN, Michael. Practical English Usage. 4 TRASK, R. L. Mind the gaffe: the Penguin guide to common errors in English. VINCE, Michael. Advanced language practice: English grammar and vocabulary. 5 6 HEWINGS, Martin. Advanced Grammar in Use. 7 Answers to exercises unit 39
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